Drop old shells

.github/workflows/ci.yml

@@ -14,18 +14,33 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v5
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          run_install: false
-
       - name: Setup Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v4
         with:
           node-version: 22
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.8.1
+          run_install: false
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: |
+          echo "store_path=$(pnpm store path --silent)" >> $GITHUB_OUTPUT
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.pnpm-cache.outputs.store_path }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
+
       - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+        run: pnpm install
 
       # Run all tasks using workspace filters
 

.github/workflows/rust-ci.yml

@@ -63,24 +63,6 @@ jobs:
       - name: cargo fmt
         run: cargo fmt -- --config imports_granularity=Item --check
 
-  cargo_shear:
-    name: cargo shear
-    runs-on: ubuntu-24.04
-    needs: changed
-    if: ${{ needs.changed.outputs.codex == 'true' || needs.changed.outputs.workflows == 'true' || github.event_name == 'push' }}
-    defaults:
-      run:
-        working-directory: codex-rs
-    steps:
-      - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.89
-      - uses: taiki-e/install-action@0c5db7f7f897c03b771660e91d065338615679f4 # v2
-        with:
-          tool: cargo-shear
-          version: 1.5.1
-      - name: cargo shear
-        run: cargo shear
-
   # --- CI to validate on different os/targets --------------------------------
   lint_build_test:
     name: ${{ matrix.runner }} - ${{ matrix.target }}${{ matrix.profile == 'release' && ' (release)' || '' }}
@@ -178,17 +160,12 @@ jobs:
           find . -name Cargo.toml -mindepth 2 -maxdepth 2 -print0 \
             | xargs -0 -n1 -I{} bash -c 'cd "$(dirname "{}")" && cargo check --profile ${{ matrix.profile }}'
 
-      - uses: taiki-e/install-action@0c5db7f7f897c03b771660e91d065338615679f4 # v2
-        with:
-          tool: nextest
-          version: 0.9.103
-
-      - name: tests
+      - name: cargo test
         id: test
-        # Tests take too long for release builds to run them on every PR.
+        # `cargo test` takes too long for release builds to run them on every PR
         if: ${{ matrix.profile != 'release' }}
         continue-on-error: true
-        run: cargo nextest run --all-features --no-fail-fast --target ${{ matrix.target }}
+        run: cargo test --all-features --target ${{ matrix.target }} --profile ${{ matrix.profile }}
         env:
           RUST_BACKTRACE: 1
 
@@ -205,7 +182,7 @@ jobs:
   # --- Gatherer job that you mark as the ONLY required status -----------------
   results:
     name: CI results (required)
-    needs: [changed, general, cargo_shear, lint_build_test]
+    needs: [changed, general, lint_build_test]
     if: always()
     runs-on: ubuntu-24.04
     steps:
@@ -213,7 +190,6 @@ jobs:
         shell: bash
         run: |
           echo "general: ${{ needs.general.result }}"
-          echo "shear  : ${{ needs.cargo_shear.result }}"
           echo "matrix : ${{ needs.lint_build_test.result }}"
 
           # If nothing relevant changed (PR touching only root README, etc.),
@@ -225,5 +201,4 @@ jobs:
 
           # Otherwise require the jobs to have succeeded
           [[ '${{ needs.general.result }}' == 'success' ]] || { echo 'general failed'; exit 1; }
-          [[ '${{ needs.cargo_shear.result }}' == 'success' ]] || { echo 'cargo_shear failed'; exit 1; }
           [[ '${{ needs.lint_build_test.result }}' == 'success' ]] || { echo 'matrix failed'; exit 1; }

README.md

@@ -75,7 +75,7 @@ Codex CLI supports a rich set of configuration options, with preferences stored
   - [CLI usage](./docs/getting-started.md#cli-usage)
   - [Running with a prompt as input](./docs/getting-started.md#running-with-a-prompt-as-input)
   - [Example prompts](./docs/getting-started.md#example-prompts)
-  - [Memory with AGENTS.md](./docs/getting-started.md#memory-with-agentsmd)
+  - [Memory with AGENTS.md](./docs/getting-started.md#memory--project-docs)
   - [Configuration](./docs/config.md)
 - [**Sandbox & approvals**](./docs/sandbox.md)
 - [**Authentication**](./docs/authentication.md)

codex-rs/README.md

@@ -35,7 +35,7 @@ npx @modelcontextprotocol/inspector codex mcp
 
 You can enable notifications by configuring a script that is run whenever the agent finishes a turn. The [notify documentation](../docs/config.md#notify) includes a detailed example that explains how to get desktop notifications via [terminal-notifier](https://github.com/julienXX/terminal-notifier) on macOS.
 
-### `codex exec` to run Codex programmatically/non-interactively
+### `codex exec` to run Codex programmatially/non-interactively
 
 To run Codex non-interactively, run `codex exec PROMPT` (you can also pass the prompt via `stdin`) and Codex will work on your task until it decides that it is done and exits. Output is printed to the terminal directly. You can set the `RUST_LOG` environment variable to see more about what's going on.
 

codex-rs/apply-patch/Cargo.toml

@@ -18,7 +18,7 @@ workspace = true
 anyhow = "1"
 similar = "2.7.0"
 thiserror = "2.0.16"
-tree-sitter = "0.25.9"
+tree-sitter = "0.25.8"
 tree-sitter-bash = "0.25.0"
 once_cell = "1"
 

codex-rs/apply-patch/src/lib.rs

@@ -726,9 +726,9 @@ fn compute_replacements(
             line_index = start_idx + pattern.len();
         } else {
             return Err(ApplyPatchError::ComputeReplacements(format!(
-                "Failed to find expected lines in {}:\n{}",
-                path.display(),
-                chunk.old_lines.join("\n"),
+                "Failed to find expected lines {:?} in {}",
+                chunk.old_lines,
+                path.display()
             )));
         }
     }

codex-rs/chatgpt/Cargo.toml

@@ -12,6 +12,7 @@ clap = { version = "4", features = ["derive"] }
 codex-common = { path = "../common", features = ["cli"] }
 codex-core = { path = "../core" }
 codex-protocol = { path = "../protocol" }
+reqwest = { version = "0.12", features = ["json", "stream"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 tokio = { version = "1", features = ["full"] }

codex-rs/chatgpt/src/apply_command.rs

@@ -31,7 +31,7 @@ pub async fn run_apply_command(
         ConfigOverrides::default(),
     )?;
 
-    init_chatgpt_token_from_auth(&config.codex_home).await?;
+    init_chatgpt_token_from_auth(&config.codex_home, &config.responses_originator_header).await?;
 
     let task_response = get_task(&config, apply_cli.task_id).await?;
     apply_diff_from_task(task_response, cwd).await

codex-rs/chatgpt/src/chatgpt_client.rs

@@ -13,10 +13,10 @@ pub(crate) async fn chatgpt_get_request<T: DeserializeOwned>(
     path: String,
 ) -> anyhow::Result<T> {
     let chatgpt_base_url = &config.chatgpt_base_url;
-    init_chatgpt_token_from_auth(&config.codex_home).await?;
+    init_chatgpt_token_from_auth(&config.codex_home, &config.responses_originator_header).await?;
 
     // Make direct HTTP request to ChatGPT backend API with the token
-    let client = create_client();
+    let client = create_client(&config.responses_originator_header);
     let url = format!("{chatgpt_base_url}{path}");
 
     let token =

codex-rs/chatgpt/src/chatgpt_token.rs

@@ -19,8 +19,11 @@ pub fn set_chatgpt_token_data(value: TokenData) {
 }
 
 /// Initialize the ChatGPT token from auth.json file
-pub async fn init_chatgpt_token_from_auth(codex_home: &Path) -> std::io::Result<()> {
-    let auth = CodexAuth::from_codex_home(codex_home, AuthMode::ChatGPT)?;
+pub async fn init_chatgpt_token_from_auth(
+    codex_home: &Path,
+    originator: &str,
+) -> std::io::Result<()> {
+    let auth = CodexAuth::from_codex_home(codex_home, AuthMode::ChatGPT, originator)?;
     if let Some(auth) = auth {
         let token_data = auth.get_token_data().await?;
         set_chatgpt_token_data(token_data);

codex-rs/cli/src/login.rs

@@ -12,8 +12,8 @@ use codex_protocol::mcp_protocol::AuthMode;
 use std::env;
 use std::path::PathBuf;
 
-pub async fn login_with_chatgpt(codex_home: PathBuf) -> std::io::Result<()> {
-    let opts = ServerOptions::new(codex_home, CLIENT_ID.to_string());
+pub async fn login_with_chatgpt(codex_home: PathBuf, originator: String) -> std::io::Result<()> {
+    let opts = ServerOptions::new(codex_home, CLIENT_ID.to_string(), originator);
     let server = run_login_server(opts)?;
 
     eprintln!(
@@ -27,7 +27,12 @@ pub async fn login_with_chatgpt(codex_home: PathBuf) -> std::io::Result<()> {
 pub async fn run_login_with_chatgpt(cli_config_overrides: CliConfigOverrides) -> ! {
     let config = load_config_or_exit(cli_config_overrides);
 
-    match login_with_chatgpt(config.codex_home).await {
+    match login_with_chatgpt(
+        config.codex_home,
+        config.responses_originator_header.clone(),
+    )
+    .await
+    {
         Ok(_) => {
             eprintln!("Successfully logged in");
             std::process::exit(0);
@@ -60,7 +65,11 @@ pub async fn run_login_with_api_key(
 pub async fn run_login_status(cli_config_overrides: CliConfigOverrides) -> ! {
     let config = load_config_or_exit(cli_config_overrides);
 
-    match CodexAuth::from_codex_home(&config.codex_home, config.preferred_auth_method) {
+    match CodexAuth::from_codex_home(
+        &config.codex_home,
+        config.preferred_auth_method,
+        &config.responses_originator_header,
+    ) {
         Ok(Some(auth)) => match auth.mode {
             AuthMode::ApiKey => match auth.get_token().await {
                 Ok(api_key) => {

codex-rs/cli/src/proto.rs

@@ -40,6 +40,7 @@ pub async fn run_main(opts: ProtoCli) -> anyhow::Result<()> {
     let conversation_manager = ConversationManager::new(AuthManager::shared(
         config.codex_home.clone(),
         config.preferred_auth_method,
+        config.responses_originator_header.clone(),
     ));
     let NewConversation {
         conversation_id: _,

codex-rs/core/Cargo.toml

@@ -26,12 +26,14 @@ eventsource-stream = "0.2.3"
 futures = "0.3"
 libc = "0.2.175"
 mcp-types = { path = "../mcp-types" }
+mime_guess = "2.0"
 os_info = "3.12.0"
 portable-pty = "0.9.0"
 rand = "0.9"
 regex-lite = "0.1.7"
 reqwest = { version = "0.12", features = ["json", "stream"] }
 serde = { version = "1", features = ["derive"] }
+serde_bytes = "0.11"
 serde_json = "1"
 sha1 = "0.10.6"
 shlex = "1.3.0"
@@ -51,10 +53,10 @@ tokio-util = "0.7.16"
 toml = "0.9.5"
 toml_edit = "0.23.4"
 tracing = { version = "0.1.41", features = ["log"] }
-tree-sitter = "0.25.9"
+tree-sitter = "0.25.8"
 tree-sitter-bash = "0.25.0"
 uuid = { version = "1", features = ["serde", "v4"] }
-which = "6"
+whoami = "1.6.1"
 wildmatch = "2.4.0"
 
 
@@ -70,6 +72,9 @@ openssl-sys = { version = "*", features = ["vendored"] }
 [target.aarch64-unknown-linux-musl.dependencies]
 openssl-sys = { version = "*", features = ["vendored"] }
 
+[target.'cfg(target_os = "windows")'.dependencies]
+which = "6"
+
 [dev-dependencies]
 assert_cmd = "2"
 core_test_support = { path = "tests/common" }
@@ -80,6 +85,3 @@ tempfile = "3"
 tokio-test = "0.4"
 walkdir = "2.5.0"
 wiremock = "0.6"
-
-[package.metadata.cargo-shear]
-ignored = ["openssl-sys"]

codex-rs/core/src/auth.rs

@@ -75,8 +75,9 @@ impl CodexAuth {
     pub fn from_codex_home(
         codex_home: &Path,
         preferred_auth_method: AuthMode,
+        originator: &str,
     ) -> std::io::Result<Option<CodexAuth>> {
-        load_auth(codex_home, true, preferred_auth_method)
+        load_auth(codex_home, true, preferred_auth_method, originator)
     }
 
     pub async fn get_token_data(&self) -> Result<TokenData, std::io::Error> {
@@ -172,7 +173,7 @@ impl CodexAuth {
             mode: AuthMode::ChatGPT,
             auth_file: PathBuf::new(),
             auth_dot_json,
-            client: crate::default_client::create_client(),
+            client: crate::default_client::create_client("codex_cli_rs"),
         }
     }
 
@@ -187,7 +188,10 @@ impl CodexAuth {
     }
 
     pub fn from_api_key(api_key: &str) -> Self {
-        Self::from_api_key_with_client(api_key, crate::default_client::create_client())
+        Self::from_api_key_with_client(
+            api_key,
+            crate::default_client::create_client(crate::default_client::DEFAULT_ORIGINATOR),
+        )
     }
 }
 
@@ -228,12 +232,13 @@ fn load_auth(
     codex_home: &Path,
     include_env_var: bool,
     preferred_auth_method: AuthMode,
+    originator: &str,
 ) -> std::io::Result<Option<CodexAuth>> {
     // First, check to see if there is a valid auth.json file. If not, we fall
     // back to AuthMode::ApiKey using the OPENAI_API_KEY environment variable
     // (if it is set).
     let auth_file = get_auth_file(codex_home);
-    let client = crate::default_client::create_client();
+    let client = crate::default_client::create_client(originator);
     let auth_dot_json = match try_read_auth_json(&auth_file) {
         Ok(auth) => auth,
         // If auth.json does not exist, try to read the OPENAI_API_KEY from the
@@ -468,7 +473,7 @@ mod tests {
             auth_dot_json,
             auth_file: _,
             ..
-        } = super::load_auth(codex_home.path(), false, AuthMode::ChatGPT)
+        } = super::load_auth(codex_home.path(), false, AuthMode::ChatGPT, "codex_cli_rs")
             .unwrap()
             .unwrap();
         assert_eq!(None, api_key);
@@ -520,7 +525,7 @@ mod tests {
             auth_dot_json,
             auth_file: _,
             ..
-        } = super::load_auth(codex_home.path(), false, AuthMode::ChatGPT)
+        } = super::load_auth(codex_home.path(), false, AuthMode::ChatGPT, "codex_cli_rs")
             .unwrap()
             .unwrap();
         assert_eq!(None, api_key);
@@ -571,7 +576,7 @@ mod tests {
             auth_dot_json,
             auth_file: _,
             ..
-        } = super::load_auth(codex_home.path(), false, AuthMode::ChatGPT)
+        } = super::load_auth(codex_home.path(), false, AuthMode::ChatGPT, "codex_cli_rs")
             .unwrap()
             .unwrap();
         assert_eq!(Some("sk-test-key".to_string()), api_key);
@@ -591,7 +596,7 @@ mod tests {
         )
         .unwrap();
 
-        let auth = super::load_auth(dir.path(), false, AuthMode::ChatGPT)
+        let auth = super::load_auth(dir.path(), false, AuthMode::ChatGPT, "codex_cli_rs")
             .unwrap()
             .unwrap();
         assert_eq!(auth.mode, AuthMode::ApiKey);
@@ -675,6 +680,7 @@ mod tests {
 #[derive(Debug)]
 pub struct AuthManager {
     codex_home: PathBuf,
+    originator: String,
     inner: RwLock<CachedAuth>,
 }
 
@@ -683,12 +689,13 @@ impl AuthManager {
     /// preferred auth method. Errors loading auth are swallowed; `auth()` will
     /// simply return `None` in that case so callers can treat it as an
     /// unauthenticated state.
-    pub fn new(codex_home: PathBuf, preferred_auth_mode: AuthMode) -> Self {
-        let auth = CodexAuth::from_codex_home(&codex_home, preferred_auth_mode)
+    pub fn new(codex_home: PathBuf, preferred_auth_mode: AuthMode, originator: String) -> Self {
+        let auth = CodexAuth::from_codex_home(&codex_home, preferred_auth_mode, &originator)
             .ok()
             .flatten();
         Self {
             codex_home,
+            originator,
             inner: RwLock::new(CachedAuth {
                 preferred_auth_mode,
                 auth,
@@ -705,6 +712,7 @@ impl AuthManager {
         };
         Arc::new(Self {
             codex_home: PathBuf::new(),
+            originator: "codex_cli_rs".to_string(),
             inner: RwLock::new(cached),
         })
     }
@@ -726,7 +734,7 @@ impl AuthManager {
     /// whether the auth value changed.
     pub fn reload(&self) -> bool {
         let preferred = self.preferred_auth_method();
-        let new_auth = CodexAuth::from_codex_home(&self.codex_home, preferred)
+        let new_auth = CodexAuth::from_codex_home(&self.codex_home, preferred, &self.originator)
             .ok()
             .flatten();
         if let Ok(mut guard) = self.inner.write() {
@@ -747,8 +755,12 @@ impl AuthManager {
     }
 
     /// Convenience constructor returning an `Arc` wrapper.
-    pub fn shared(codex_home: PathBuf, preferred_auth_mode: AuthMode) -> Arc<Self> {
-        Arc::new(Self::new(codex_home, preferred_auth_mode))
+    pub fn shared(
+        codex_home: PathBuf,
+        preferred_auth_mode: AuthMode,
+        originator: String,
+    ) -> Arc<Self> {
+        Arc::new(Self::new(codex_home, preferred_auth_mode, originator))
     }
 
     /// Attempt to refresh the current auth token (if any). On success, reload

codex-rs/core/src/chat_completions.rs

@@ -56,9 +56,9 @@ pub(crate) async fn stream_chat_completions(
     for item in &input {
         match item {
             ResponseItem::Message { role, .. } => last_emitted_role = Some(role.as_str()),
-            ResponseItem::FunctionCall { .. } | ResponseItem::LocalShellCall { .. } => {
-                last_emitted_role = Some("assistant")
-            }
+            ResponseItem::FunctionCall { .. }
+            | ResponseItem::LocalShellCall { .. }
+            | ResponseItem::UnifiedExec { .. } => last_emitted_role = Some("assistant"),
             ResponseItem::FunctionCallOutput { .. } => last_emitted_role = Some("tool"),
             ResponseItem::Reasoning { .. } | ResponseItem::Other => {}
             ResponseItem::CustomToolCall { .. } => {}
@@ -119,7 +119,9 @@ pub(crate) async fn stream_chat_completions(
                 // Otherwise, attach to immediate next assistant anchor (tool-calls or assistant message)
                 if !attached && idx + 1 < input.len() {
                     match &input[idx + 1] {
-                        ResponseItem::FunctionCall { .. } | ResponseItem::LocalShellCall { .. } => {
+                        ResponseItem::FunctionCall { .. }
+                        | ResponseItem::LocalShellCall { .. }
+                        | ResponseItem::UnifiedExec { .. } => {
                             reasoning_by_anchor_index
                                 .entry(idx + 1)
                                 .and_modify(|v| v.push_str(&text))
@@ -224,6 +226,12 @@ pub(crate) async fn stream_chat_completions(
                 }
                 messages.push(msg);
             }
+            ResponseItem::UnifiedExec { .. } => {
+                // The interactive shell tool is currently exposed only via the
+                // Responses API. Ignore these items when using Chat
+                // Completions to maintain feature parity with existing
+                // behaviour.
+            }
             ResponseItem::FunctionCallOutput { call_id, output } => {
                 messages.push(json!({
                     "role": "tool",

codex-rs/core/src/client.rs

@@ -6,7 +6,6 @@ use std::time::Duration;
 use crate::AuthManager;
 use bytes::Bytes;
 use codex_protocol::mcp_protocol::AuthMode;
-use codex_protocol::mcp_protocol::ConversationId;
 use eventsource_stream::Eventsource;
 use futures::prelude::*;
 use regex_lite::Regex;
@@ -20,6 +19,7 @@ use tokio_util::io::ReaderStream;
 use tracing::debug;
 use tracing::trace;
 use tracing::warn;
+use uuid::Uuid;
 
 use crate::chat_completions::AggregateStreamExt;
 use crate::chat_completions::stream_chat_completions;
@@ -70,7 +70,7 @@ pub struct ModelClient {
     auth_manager: Option<Arc<AuthManager>>,
     client: reqwest::Client,
     provider: ModelProviderInfo,
-    conversation_id: ConversationId,
+    session_id: Uuid,
     effort: ReasoningEffortConfig,
     summary: ReasoningSummaryConfig,
 }
@@ -82,16 +82,16 @@ impl ModelClient {
         provider: ModelProviderInfo,
         effort: ReasoningEffortConfig,
         summary: ReasoningSummaryConfig,
-        conversation_id: ConversationId,
+        session_id: Uuid,
     ) -> Self {
-        let client = create_client();
+        let client = create_client(&config.responses_originator_header);
 
         Self {
             config,
             auth_manager,
             client,
             provider,
-            conversation_id,
+            session_id,
             effort,
             summary,
         }
@@ -197,7 +197,7 @@ impl ModelClient {
             store: false,
             stream: true,
             include,
-            prompt_cache_key: Some(self.conversation_id.to_string()),
+            prompt_cache_key: Some(self.session_id.to_string()),
             text,
         };
 
@@ -223,9 +223,7 @@ impl ModelClient {
 
             req_builder = req_builder
                 .header("OpenAI-Beta", "responses=experimental")
-                // Send session_id for compatibility.
-                .header("conversation_id", self.conversation_id.to_string())
-                .header("session_id", self.conversation_id.to_string())
+                .header("session_id", self.session_id.to_string())
                 .header(reqwest::header::ACCEPT, "text/event-stream")
                 .json(&payload);
 
@@ -400,15 +398,9 @@ impl From<ResponseCompletedUsage> for TokenUsage {
     fn from(val: ResponseCompletedUsage) -> Self {
         TokenUsage {
             input_tokens: val.input_tokens,
-            cached_input_tokens: val
-                .input_tokens_details
-                .map(|d| d.cached_tokens)
-                .unwrap_or(0),
+            cached_input_tokens: val.input_tokens_details.map(|d| d.cached_tokens),
             output_tokens: val.output_tokens,
-            reasoning_output_tokens: val
-                .output_tokens_details
-                .map(|d| d.reasoning_tokens)
-                .unwrap_or(0),
+            reasoning_output_tokens: val.output_tokens_details.map(|d| d.reasoning_tokens),
             total_tokens: val.total_tokens,
         }
     }

codex-rs/core/src/codex.rs

@@ -9,18 +9,13 @@ use std::sync::atomic::AtomicU64;
 use std::time::Duration;
 
 use crate::AuthManager;
-use crate::config_edit::CONFIG_KEY_EFFORT;
-use crate::config_edit::CONFIG_KEY_MODEL;
-use crate::config_edit::persist_non_null_overrides;
 use crate::event_mapping::map_response_item_to_event_messages;
 use async_channel::Receiver;
 use async_channel::Sender;
 use codex_apply_patch::ApplyPatchAction;
 use codex_apply_patch::MaybeApplyPatchVerified;
 use codex_apply_patch::maybe_parse_apply_patch_verified;
-use codex_protocol::mcp_protocol::ConversationId;
-use codex_protocol::protocol::ConversationPathResponseEvent;
-use codex_protocol::protocol::RolloutItem;
+use codex_protocol::protocol::ConversationHistoryResponseEvent;
 use codex_protocol::protocol::TaskStartedEvent;
 use codex_protocol::protocol::TurnAbortReason;
 use codex_protocol::protocol::TurnAbortedEvent;
@@ -36,6 +31,7 @@ use tracing::error;
 use tracing::info;
 use tracing::trace;
 use tracing::warn;
+use uuid::Uuid;
 
 use crate::ModelProviderInfo;
 use crate::apply_patch;
@@ -49,6 +45,7 @@ use crate::client_common::ResponseEvent;
 use crate::config::Config;
 use crate::config_types::ShellEnvironmentPolicy;
 use crate::conversation_history::ConversationHistory;
+use crate::conversation_manager::InitialHistory;
 use crate::environment_context::EnvironmentContext;
 use crate::error::CodexErr;
 use crate::error::Result as CodexResult;
@@ -103,11 +100,9 @@ use crate::protocol::SessionConfiguredEvent;
 use crate::protocol::StreamErrorEvent;
 use crate::protocol::Submission;
 use crate::protocol::TaskCompleteEvent;
-use crate::protocol::TokenUsageInfo;
 use crate::protocol::TurnDiffEvent;
 use crate::protocol::WebSearchBeginEvent;
 use crate::rollout::RolloutRecorder;
-use crate::rollout::RolloutRecorderParams;
 use crate::safety::SafetyCheck;
 use crate::safety::assess_command_safety;
 use crate::safety::assess_safety_for_untrusted_command;
@@ -126,7 +121,6 @@ use codex_protocol::models::LocalShellAction;
 use codex_protocol::models::ResponseInputItem;
 use codex_protocol::models::ResponseItem;
 use codex_protocol::models::ShellToolCallParams;
-use codex_protocol::protocol::InitialHistory;
 
 // A convenience extension trait for acquiring mutex locks where poisoning is
 // unrecoverable and should abort the program. This avoids scattered `.unwrap()`
@@ -156,7 +150,7 @@ pub struct Codex {
 /// unique session id.
 pub struct CodexSpawnOk {
     pub codex: Codex,
-    pub conversation_id: ConversationId,
+    pub session_id: Uuid,
 }
 
 pub(crate) const INITIAL_SUBMIT_ID: &str = "";
@@ -209,7 +203,10 @@ impl Codex {
             error!("Failed to create session: {e:#}");
             CodexErr::InternalAgentDied
         })?;
-        let conversation_id = session.conversation_id;
+        session
+            .record_initial_history(&turn_context, conversation_history)
+            .await;
+        let session_id = session.session_id;
 
         // This task will run until Op::Shutdown is received.
         tokio::spawn(submission_loop(
@@ -224,10 +221,7 @@ impl Codex {
             rx_event,
         };
 
-        Ok(CodexSpawnOk {
-            codex,
-            conversation_id,
-        })
+        Ok(CodexSpawnOk { codex, session_id })
     }
 
     /// Submit the `op` wrapped in a `Submission` with a unique ID.
@@ -269,14 +263,13 @@ struct State {
     pending_approvals: HashMap<String, oneshot::Sender<ReviewDecision>>,
     pending_input: Vec<ResponseInputItem>,
     history: ConversationHistory,
-    token_info: Option<TokenUsageInfo>,
 }
 
 /// Context for an initialized model agent
 ///
 /// A session has at most 1 running task at a time, and can be interrupted by user input.
 pub(crate) struct Session {
-    conversation_id: ConversationId,
+    session_id: Uuid,
     tx_event: Sender<Event>,
 
     /// Manager for external MCP servers/tools.
@@ -366,6 +359,7 @@ impl Session {
         tx_event: Sender<Event>,
         initial_history: InitialHistory,
     ) -> anyhow::Result<(Arc<Self>, TurnContext)> {
+        let session_id = Uuid::new_v4();
         let ConfigureSession {
             provider,
             model,
@@ -383,20 +377,6 @@ impl Session {
             return Err(anyhow::anyhow!("cwd is not absolute: {cwd:?}"));
         }
 
-        let (conversation_id, rollout_params) = match &initial_history {
-            InitialHistory::New | InitialHistory::Forked(_) => {
-                let conversation_id = ConversationId::default();
-                (
-                    conversation_id,
-                    RolloutRecorderParams::new(conversation_id, user_instructions.clone()),
-                )
-            }
-            InitialHistory::Resumed(resumed_history) => (
-                resumed_history.conversation_id,
-                RolloutRecorderParams::resume(resumed_history.rollout_path.clone()),
-            ),
-        };
-
         // Error messages to dispatch after SessionConfigured is sent.
         let mut post_session_configured_error_events = Vec::<Event>::new();
 
@@ -406,7 +386,7 @@ impl Session {
         // - spin up MCP connection manager
         // - perform default shell discovery
         // - load history metadata
-        let rollout_fut = RolloutRecorder::new(&config, rollout_params);
+        let rollout_fut = RolloutRecorder::new(&config, session_id, user_instructions.clone());
 
         let mcp_fut = McpConnectionManager::new(config.mcp_servers.clone());
         let default_shell_fut = shell::default_user_shell();
@@ -420,7 +400,6 @@ impl Session {
             error!("failed to initialize rollout recorder: {e:#}");
             anyhow::anyhow!("failed to initialize rollout recorder: {e:#}")
         })?;
-        let rollout_path = rollout_recorder.rollout_path.clone();
         // Create the mutable state for the Session.
         let state = State {
             history: ConversationHistory::new(),
@@ -453,7 +432,7 @@ impl Session {
             }
         }
 
-        // Now that the conversation id is final (may have been updated by resume),
+        // Now that `session_id` is final (may have been updated by resume),
         // construct the model client.
         let client = ModelClient::new(
             config.clone(),
@@ -461,19 +440,19 @@ impl Session {
             provider.clone(),
             model_reasoning_effort,
             model_reasoning_summary,
-            conversation_id,
+            session_id,
         );
         let turn_context = TurnContext {
             client,
             tools_config: ToolsConfig::new(&ToolsConfigParams {
                 model_family: &config.model_family,
                 approval_policy,
+                sandbox_policy: sandbox_policy.clone(),
                 include_plan_tool: config.include_plan_tool,
                 include_apply_patch_tool: config.include_apply_patch_tool,
                 include_web_search_request: config.tools_web_search_request,
                 use_streamable_shell_tool: config.use_experimental_streamable_shell_tool,
                 include_view_image_tool: config.include_view_image_tool,
-                experimental_unified_exec_tool: config.use_experimental_unified_exec_tool,
             }),
             user_instructions,
             base_instructions,
@@ -483,7 +462,7 @@ impl Session {
             cwd,
         };
         let sess = Arc::new(Session {
-            conversation_id,
+            session_id,
             tx_event: tx_event.clone(),
             mcp_connection_manager,
             session_manager: ExecSessionManager::default(),
@@ -498,24 +477,26 @@ impl Session {
 
         // Dispatch the SessionConfiguredEvent first and then report any errors.
         // If resuming, include converted initial messages in the payload so UIs can render them immediately.
-        let initial_messages = initial_history.get_event_msgs();
-        sess.record_initial_history(&turn_context, initial_history)
-            .await;
+        let initial_messages = match &initial_history {
+            InitialHistory::New => None,
+            InitialHistory::Resumed(items) => Some(sess.build_initial_messages(items)),
+        };
 
         let events = std::iter::once(Event {
             id: INITIAL_SUBMIT_ID.to_owned(),
             msg: EventMsg::SessionConfigured(SessionConfiguredEvent {
-                session_id: conversation_id,
+                session_id,
                 model,
                 history_log_id,
                 history_entry_count,
                 initial_messages,
-                rollout_path,
             }),
         })
         .chain(post_session_configured_error_events.into_iter());
         for event in events {
-            sess.send_event(event).await;
+            if let Err(e) = tx_event.send(event).await {
+                error!("failed to send event: {e:?}");
+            }
         }
 
         Ok((sess, turn_context))
@@ -545,33 +526,49 @@ impl Session {
     ) {
         match conversation_history {
             InitialHistory::New => {
-                // Build and record initial items (user instructions + environment context)
-                let items = self.build_initial_context(turn_context);
-                self.record_conversation_items(&items).await;
+                self.record_initial_history_new(turn_context).await;
             }
-            InitialHistory::Resumed(_) | InitialHistory::Forked(_) => {
-                let rollout_items = conversation_history.get_rollout_items();
-                let persist = matches!(conversation_history, InitialHistory::Forked(_));
-
-                // Always add response items to conversation history
-                let response_items = conversation_history.get_response_items();
-                if !response_items.is_empty() {
-                    self.record_into_history(&response_items);
-                }
-
-                // If persisting, persist all rollout items as-is (recorder filters)
-                if persist && !rollout_items.is_empty() {
-                    self.persist_rollout_items(&rollout_items).await;
-                }
+            InitialHistory::Resumed(items) => {
+                self.record_initial_history_resumed(items).await;
             }
         }
     }
 
-    /// Persist the event to rollout and send it to clients.
+    async fn record_initial_history_new(&self, turn_context: &TurnContext) {
+        // record the initial user instructions and environment context,
+        // regardless of whether we restored items.
+        // TODO: Those items shouldn't be "user messages" IMO. Maybe developer messages.
+        let mut conversation_items = Vec::<ResponseItem>::with_capacity(2);
+        if let Some(user_instructions) = turn_context.user_instructions.as_deref() {
+            conversation_items.push(UserInstructions::new(user_instructions.to_string()).into());
+        }
+        conversation_items.push(ResponseItem::from(EnvironmentContext::new(
+            Some(turn_context.cwd.clone()),
+            Some(turn_context.approval_policy),
+            Some(turn_context.sandbox_policy.clone()),
+            Some(self.user_shell.clone()),
+        )));
+        self.record_conversation_items(&conversation_items).await;
+    }
+
+    async fn record_initial_history_resumed(&self, items: Vec<ResponseItem>) {
+        self.record_conversation_items(&items).await;
+    }
+
+    /// build the initial messages vector for SessionConfigured by converting
+    /// ResponseItems into EventMsg.
+    fn build_initial_messages(&self, items: &[ResponseItem]) -> Vec<EventMsg> {
+        items
+            .iter()
+            .flat_map(|item| {
+                map_response_item_to_event_messages(item, self.show_raw_agent_reasoning)
+            })
+            .collect()
+    }
+
+    /// Sends the given event to the client and swallows the send event, if
+    /// any, logging it as an error.
     pub(crate) async fn send_event(&self, event: Event) {
-        // Persist the event into rollout (recorder filters as needed)
-        let rollout_items = vec![RolloutItem::EventMsg(event.msg.clone())];
-        self.persist_rollout_items(&rollout_items).await;
         if let Err(e) = self.tx_event.send(event).await {
             error!("failed to send tool call event: {e}");
         }
@@ -605,7 +602,7 @@ impl Session {
                 reason,
             }),
         };
-        self.send_event(event).await;
+        let _ = self.tx_event.send(event).await;
         rx_approve
     }
 
@@ -637,7 +634,7 @@ impl Session {
                 grant_root,
             }),
         };
-        self.send_event(event).await;
+        let _ = self.tx_event.send(event).await;
         rx_approve
     }
 
@@ -661,76 +658,30 @@ impl Session {
         state.approved_commands.insert(cmd);
     }
 
-    /// Records input items: always append to conversation history and
-    /// persist these response items to rollout.
+    /// Records items to both the rollout and the chat completions/ZDR
+    /// transcript, if enabled.
     async fn record_conversation_items(&self, items: &[ResponseItem]) {
-        self.record_into_history(items);
-        self.persist_rollout_response_items(items).await;
+        debug!("Recording items for conversation: {items:?}");
+        self.record_state_snapshot(items).await;
+
+        self.state.lock_unchecked().history.record_items(items);
     }
 
-    /// Append ResponseItems to the in-memory conversation history only.
-    fn record_into_history(&self, items: &[ResponseItem]) {
-        self.state
-            .lock_unchecked()
-            .history
-            .record_items(items.iter());
-    }
+    async fn record_state_snapshot(&self, items: &[ResponseItem]) {
+        let snapshot = { crate::rollout::SessionStateSnapshot {} };
 
-    async fn persist_rollout_response_items(&self, items: &[ResponseItem]) {
-        let rollout_items: Vec<RolloutItem> = items
-            .iter()
-            .cloned()
-            .map(RolloutItem::ResponseItem)
-            .collect();
-        self.persist_rollout_items(&rollout_items).await;
-    }
-
-    fn build_initial_context(&self, turn_context: &TurnContext) -> Vec<ResponseItem> {
-        let mut items = Vec::<ResponseItem>::with_capacity(2);
-        if let Some(user_instructions) = turn_context.user_instructions.as_deref() {
-            items.push(UserInstructions::new(user_instructions.to_string()).into());
-        }
-        items.push(ResponseItem::from(EnvironmentContext::new(
-            Some(turn_context.cwd.clone()),
-            Some(turn_context.approval_policy),
-            Some(turn_context.sandbox_policy.clone()),
-            Some(self.user_shell.clone()),
-        )));
-        items
-    }
-
-    async fn persist_rollout_items(&self, items: &[RolloutItem]) {
         let recorder = {
             let guard = self.rollout.lock_unchecked();
             guard.as_ref().cloned()
         };
-        if let Some(rec) = recorder
-            && let Err(e) = rec.record_items(items).await
-        {
-            error!("failed to record rollout items: {e:#}");
-        }
-    }
 
-    /// Record a user input item to conversation history and also persist a
-    /// corresponding UserMessage EventMsg to rollout.
-    async fn record_input_and_rollout_usermsg(&self, response_input: &ResponseInputItem) {
-        let response_item: ResponseItem = response_input.clone().into();
-        // Add to conversation history and persist response item to rollout
-        self.record_conversation_items(std::slice::from_ref(&response_item))
-            .await;
-
-        // Derive user message events and persist only UserMessage to rollout
-        let msgs =
-            map_response_item_to_event_messages(&response_item, self.show_raw_agent_reasoning);
-        let user_msgs: Vec<RolloutItem> = msgs
-            .into_iter()
-            .filter_map(|m| match m {
-                EventMsg::UserMessage(ev) => Some(RolloutItem::EventMsg(EventMsg::UserMessage(ev))),
-                _ => None,
-            })
-            .collect();
-        if !user_msgs.is_empty() {
-            self.persist_rollout_items(&user_msgs).await;
+        if let Some(rec) = recorder {
+            if let Err(e) = rec.record_state(snapshot).await {
+                error!("failed to record rollout state: {e:#}");
+            }
+            if let Err(e) = rec.record_items(items).await {
+                error!("failed to record rollout items: {e:#}");
+            }
         }
     }
 
@@ -773,7 +724,7 @@ impl Session {
             id: sub_id.to_string(),
             msg,
         };
-        self.send_event(event).await;
+        let _ = self.tx_event.send(event).await;
     }
 
     async fn on_exec_command_end(
@@ -820,7 +771,7 @@ impl Session {
             id: sub_id.to_string(),
             msg,
         };
-        self.send_event(event).await;
+        let _ = self.tx_event.send(event).await;
 
         // If this is an apply_patch, after we emit the end patch, emit a second event
         // with the full turn diff if there is one.
@@ -832,7 +783,7 @@ impl Session {
                     id: sub_id.into(),
                     msg,
                 };
-                self.send_event(event).await;
+                let _ = self.tx_event.send(event).await;
             }
         }
     }
@@ -898,7 +849,7 @@ impl Session {
                 message: message.into(),
             }),
         };
-        self.send_event(event).await;
+        let _ = self.tx_event.send(event).await;
     }
 
     async fn notify_stream_error(&self, sub_id: &str, message: impl Into<String>) {
@@ -908,7 +859,7 @@ impl Session {
                 message: message.into(),
             }),
         };
-        self.send_event(event).await;
+        let _ = self.tx_event.send(event).await;
     }
 
     /// Build the full turn input by concatenating the current conversation
@@ -1071,9 +1022,9 @@ impl AgentTask {
                 id: self.sub_id,
                 msg: EventMsg::TurnAborted(TurnAbortedEvent { reason }),
             };
-            let sess = self.sess.clone();
+            let tx_event = self.sess.tx_event.clone();
             tokio::spawn(async move {
-                sess.send_event(event).await;
+                tx_event.send(event).await.ok();
             });
         }
     }
@@ -1107,10 +1058,10 @@ async fn submission_loop(
                 let provider = prev.client.get_provider();
 
                 // Effective model + family
-                let (effective_model, effective_family) = if let Some(ref m) = model {
+                let (effective_model, effective_family) = if let Some(m) = model {
                     let fam =
-                        find_family_for_model(m).unwrap_or_else(|| config.model_family.clone());
-                    (m.clone(), fam)
+                        find_family_for_model(&m).unwrap_or_else(|| config.model_family.clone());
+                    (m, fam)
                 } else {
                     (prev.client.get_model(), prev.client.get_model_family())
                 };
@@ -1135,7 +1086,7 @@ async fn submission_loop(
                     provider,
                     effective_effort,
                     effective_summary,
-                    sess.conversation_id,
+                    sess.session_id,
                 );
 
                 let new_approval_policy = approval_policy.unwrap_or(prev.approval_policy);
@@ -1147,12 +1098,12 @@ async fn submission_loop(
                 let tools_config = ToolsConfig::new(&ToolsConfigParams {
                     model_family: &effective_family,
                     approval_policy: new_approval_policy,
+                    sandbox_policy: new_sandbox_policy.clone(),
                     include_plan_tool: config.include_plan_tool,
                     include_apply_patch_tool: config.include_apply_patch_tool,
                     include_web_search_request: config.tools_web_search_request,
                     use_streamable_shell_tool: config.use_experimental_streamable_shell_tool,
                     include_view_image_tool: config.include_view_image_tool,
-                    experimental_unified_exec_tool: config.use_experimental_unified_exec_tool,
                 });
 
                 let new_turn_context = TurnContext {
@@ -1168,34 +1119,25 @@ async fn submission_loop(
 
                 // Install the new persistent context for subsequent tasks/turns.
                 turn_context = Arc::new(new_turn_context);
-
-                // Optionally persist changes to model / effort
-                let effort_str = effort.map(|_| effective_effort.to_string());
-
-                if let Err(e) = persist_non_null_overrides(
-                    &config.codex_home,
-                    config.active_profile.as_deref(),
-                    &[
-                        (&[CONFIG_KEY_MODEL], model.as_deref()),
-                        (&[CONFIG_KEY_EFFORT], effort_str.as_deref()),
-                    ],
-                )
-                .await
-                {
-                    warn!("failed to persist overrides: {e:#}");
+                if cwd.is_some() || approval_policy.is_some() || sandbox_policy.is_some() {
+                    sess.record_conversation_items(&[ResponseItem::from(EnvironmentContext::new(
+                        cwd,
+                        approval_policy,
+                        sandbox_policy,
+                        // Shell is not configurable from turn to turn
+                        None,
+                    ))])
+                    .await;
                 }
             }
             Op::UserInput { items } => {
-                submit_user_input(
-                    turn_context.cwd.clone(),
-                    turn_context.approval_policy,
-                    turn_context.sandbox_policy.clone(),
-                    &sess,
-                    &turn_context,
-                    sub.id.clone(),
-                    items,
-                )
-                .await;
+                // attempt to inject input into current task
+                if let Err(items) = sess.inject_input(items) {
+                    // no current task, spawn a new one
+                    let task =
+                        AgentTask::spawn(sess.clone(), Arc::clone(&turn_context), sub.id, items);
+                    sess.set_task(task);
+                }
             }
             Op::UserTurn {
                 items,
@@ -1232,7 +1174,7 @@ async fn submission_loop(
                         provider,
                         effort,
                         summary,
-                        sess.conversation_id,
+                        sess.session_id,
                     );
 
                     let fresh_turn_context = TurnContext {
@@ -1240,14 +1182,13 @@ async fn submission_loop(
                         tools_config: ToolsConfig::new(&ToolsConfigParams {
                             model_family: &model_family,
                             approval_policy,
+                            sandbox_policy: sandbox_policy.clone(),
                             include_plan_tool: config.include_plan_tool,
                             include_apply_patch_tool: config.include_apply_patch_tool,
                             include_web_search_request: config.tools_web_search_request,
                             use_streamable_shell_tool: config
                                 .use_experimental_streamable_shell_tool,
                             include_view_image_tool: config.include_view_image_tool,
-                            experimental_unified_exec_tool: config
-                                .use_experimental_unified_exec_tool,
                         }),
                         user_instructions: turn_context.user_instructions.clone(),
                         base_instructions: turn_context.base_instructions.clone(),
@@ -1256,16 +1197,11 @@ async fn submission_loop(
                         shell_environment_policy: turn_context.shell_environment_policy.clone(),
                         cwd,
                     };
-                    submit_user_input(
-                        fresh_turn_context.cwd.clone(),
-                        fresh_turn_context.approval_policy,
-                        fresh_turn_context.sandbox_policy.clone(),
-                        &sess,
-                        &Arc::new(fresh_turn_context),
-                        sub.id.clone(),
-                        items,
-                    )
-                    .await;
+                    // TODO: record the new environment context in the conversation history
+                    // no current task, spawn a new one with the per‑turn context
+                    let task =
+                        AgentTask::spawn(sess.clone(), Arc::new(fresh_turn_context), sub.id, items);
+                    sess.set_task(task);
                 }
             }
             Op::ExecApproval { id, decision } => match decision {
@@ -1281,7 +1217,7 @@ async fn submission_loop(
                 other => sess.notify_approval(&id, other),
             },
             Op::AddToHistory { text } => {
-                let id = sess.conversation_id;
+                let id = sess.session_id;
                 let config = config.clone();
                 tokio::spawn(async move {
                     if let Err(e) = crate::message_history::append_entry(&text, &id, &config).await
@@ -1293,7 +1229,7 @@ async fn submission_loop(
 
             Op::GetHistoryEntryRequest { offset, log_id } => {
                 let config = config.clone();
-                let sess_clone = sess.clone();
+                let tx_event = sess.tx_event.clone();
                 let sub_id = sub.id.clone();
 
                 tokio::spawn(async move {
@@ -1312,7 +1248,7 @@ async fn submission_loop(
                                 log_id,
                                 entry: entry_opt.map(|e| {
                                     codex_protocol::message_history::HistoryEntry {
-                                        conversation_id: e.session_id,
+                                        session_id: e.session_id,
                                         ts: e.ts,
                                         text: e.text,
                                     }
@@ -1321,10 +1257,13 @@ async fn submission_loop(
                         ),
                     };
 
-                    sess_clone.send_event(event).await;
+                    if let Err(e) = tx_event.send(event).await {
+                        warn!("failed to send GetHistoryEntryResponse event: {e}");
+                    }
                 });
             }
             Op::ListMcpTools => {
+                let tx_event = sess.tx_event.clone();
                 let sub_id = sub.id.clone();
 
                 // This is a cheap lookup from the connection manager's cache.
@@ -1335,9 +1274,12 @@ async fn submission_loop(
                         crate::protocol::McpListToolsResponseEvent { tools },
                     ),
                 };
-                sess.send_event(event).await;
+                if let Err(e) = tx_event.send(event).await {
+                    warn!("failed to send McpListToolsResponse event: {e}");
+                }
             }
             Op::ListCustomPrompts => {
+                let tx_event = sess.tx_event.clone();
                 let sub_id = sub.id.clone();
 
                 let custom_prompts: Vec<CustomPrompt> =
@@ -1353,7 +1295,9 @@ async fn submission_loop(
                         custom_prompts,
                     }),
                 };
-                sess.send_event(event).await;
+                if let Err(e) = tx_event.send(event).await {
+                    warn!("failed to send ListCustomPromptsResponse event: {e}");
+                }
             }
             Op::Compact => {
                 // Create a summarization request as user input
@@ -1389,42 +1333,34 @@ async fn submission_loop(
                             message: "Failed to shutdown rollout recorder".to_string(),
                         }),
                     };
-                    sess.send_event(event).await;
+                    if let Err(e) = sess.tx_event.send(event).await {
+                        warn!("failed to send error message: {e:?}");
+                    }
                 }
 
                 let event = Event {
                     id: sub.id.clone(),
                     msg: EventMsg::ShutdownComplete,
                 };
-                sess.send_event(event).await;
+                if let Err(e) = sess.tx_event.send(event).await {
+                    warn!("failed to send Shutdown event: {e}");
+                }
                 break;
             }
-            Op::GetPath => {
+            Op::GetHistory => {
+                let tx_event = sess.tx_event.clone();
                 let sub_id = sub.id.clone();
-                // Flush rollout writes before returning the path so readers observe a consistent file.
-                let (path, rec_opt) = {
-                    let guard = sess.rollout.lock_unchecked();
-                    match guard.as_ref() {
-                        Some(rec) => (rec.get_rollout_path(), Some(rec.clone())),
-                        None => {
-                            error!("rollout recorder not found");
-                            continue;
-                        }
-                    }
-                };
-                if let Some(rec) = rec_opt
-                    && let Err(e) = rec.flush().await
-                {
-                    warn!("failed to flush rollout recorder before GetHistory: {e}");
-                }
+
                 let event = Event {
                     id: sub_id.clone(),
-                    msg: EventMsg::ConversationPath(ConversationPathResponseEvent {
-                        conversation_id: sess.conversation_id,
-                        path,
+                    msg: EventMsg::ConversationHistory(ConversationHistoryResponseEvent {
+                        conversation_id: sess.session_id,
+                        entries: sess.state.lock_unchecked().history.contents(),
                     }),
                 };
-                sess.send_event(event).await;
+                if let Err(e) = tx_event.send(event).await {
+                    warn!("failed to send ConversationHistory event: {e}");
+                }
             }
             _ => {
                 // Ignore unknown ops; enum is non_exhaustive to allow extensions.
@@ -1462,10 +1398,12 @@ async fn run_task(
             model_context_window: turn_context.client.get_model_context_window(),
         }),
     };
-    sess.send_event(event).await;
+    if sess.tx_event.send(event).await.is_err() {
+        return;
+    }
 
     let initial_input_for_turn: ResponseInputItem = ResponseInputItem::from(input);
-    sess.record_input_and_rollout_usermsg(&initial_input_for_turn)
+    sess.record_conversation_items(&[initial_input_for_turn.clone().into()])
         .await;
 
     let mut last_agent_message: Option<String> = None;
@@ -1634,7 +1572,7 @@ async fn run_task(
                         message: e.to_string(),
                     }),
                 };
-                sess.send_event(event).await;
+                sess.tx_event.send(event).await.ok();
                 // let the user continue the conversation
                 break;
             }
@@ -1645,7 +1583,7 @@ async fn run_task(
         id: sub_id,
         msg: EventMsg::TaskComplete(TaskCompleteEvent { last_agent_message }),
     };
-    sess.send_event(event).await;
+    sess.tx_event.send(event).await.ok();
 }
 
 async fn run_turn(
@@ -1833,22 +1771,15 @@ async fn try_run_turn(
                 response_id: _,
                 token_usage,
             } => {
-                let info = {
-                    let mut st = sess.state.lock_unchecked();
-                    let info = TokenUsageInfo::new_or_append(
-                        &st.token_info,
-                        &token_usage,
-                        turn_context.client.get_model_context_window(),
-                    );
-                    st.token_info = info.clone();
-                    info
-                };
-                let _ = sess
-                    .send_event(Event {
-                        id: sub_id.to_string(),
-                        msg: EventMsg::TokenCount(crate::protocol::TokenCountEvent { info }),
-                    })
-                    .await;
+                if let Some(token_usage) = token_usage {
+                    sess.tx_event
+                        .send(Event {
+                            id: sub_id.to_string(),
+                            msg: EventMsg::TokenCount(token_usage),
+                        })
+                        .await
+                        .ok();
+                }
 
                 let unified_diff = turn_diff_tracker.get_unified_diff();
                 if let Ok(Some(unified_diff)) = unified_diff {
@@ -1857,7 +1788,7 @@ async fn try_run_turn(
                         id: sub_id.to_string(),
                         msg,
                     };
-                    sess.send_event(event).await;
+                    let _ = sess.tx_event.send(event).await;
                 }
 
                 return Ok(output);
@@ -1867,21 +1798,21 @@ async fn try_run_turn(
                     id: sub_id.to_string(),
                     msg: EventMsg::AgentMessageDelta(AgentMessageDeltaEvent { delta }),
                 };
-                sess.send_event(event).await;
+                sess.tx_event.send(event).await.ok();
             }
             ResponseEvent::ReasoningSummaryDelta(delta) => {
                 let event = Event {
                     id: sub_id.to_string(),
                     msg: EventMsg::AgentReasoningDelta(AgentReasoningDeltaEvent { delta }),
                 };
-                sess.send_event(event).await;
+                sess.tx_event.send(event).await.ok();
             }
             ResponseEvent::ReasoningSummaryPartAdded => {
                 let event = Event {
                     id: sub_id.to_string(),
                     msg: EventMsg::AgentReasoningSectionBreak(AgentReasoningSectionBreakEvent {}),
                 };
-                sess.send_event(event).await;
+                sess.tx_event.send(event).await.ok();
             }
             ResponseEvent::ReasoningContentDelta(delta) => {
                 if sess.show_raw_agent_reasoning {
@@ -1891,7 +1822,7 @@ async fn try_run_turn(
                             AgentReasoningRawContentDeltaEvent { delta },
                         ),
                     };
-                    sess.send_event(event).await;
+                    sess.tx_event.send(event).await.ok();
                 }
             }
         }
@@ -1912,7 +1843,9 @@ async fn run_compact_task(
             model_context_window,
         }),
     };
-    sess.send_event(start_event).await;
+    if sess.tx_event.send(start_event).await.is_err() {
+        return;
+    }
 
     let initial_input_for_turn: ResponseInputItem = ResponseInputItem::from(input);
     let turn_input: Vec<ResponseItem> =
@@ -2055,6 +1988,27 @@ async fn handle_response_item(
                 .await,
             )
         }
+        ResponseItem::UnifiedExec {
+            id,
+            session_id,
+            arguments,
+            timeout_ms,
+        } => {
+            let call_id = id.clone().unwrap_or_else(|| match &session_id {
+                Some(session_id) => format!("unified_exec:{session_id}:{}", Uuid::new_v4()),
+                None => format!("unified_exec:{}", Uuid::new_v4()),
+            });
+            Some(
+                handle_unified_exec_tool_call(
+                    sess,
+                    call_id,
+                    session_id.clone(),
+                    arguments,
+                    timeout_ms,
+                )
+                .await,
+            )
+        }
         ResponseItem::CustomToolCall {
             id: _,
             call_id,
@@ -2090,7 +2044,7 @@ async fn handle_response_item(
                     id: sub_id.to_string(),
                     msg,
                 };
-                sess.send_event(event).await;
+                sess.tx_event.send(event).await.ok();
             }
             None
         }
@@ -2827,30 +2781,6 @@ async fn handle_sandbox_error(
     }
 }
 
-async fn submit_user_input(
-    cwd: PathBuf,
-    approval_policy: AskForApproval,
-    sandbox_policy: SandboxPolicy,
-    sess: &Arc<Session>,
-    turn_context: &Arc<TurnContext>,
-    sub_id: String,
-    items: Vec<InputItem>,
-) {
-    sess.record_conversation_items(&[ResponseItem::from(EnvironmentContext::new(
-        Some(cwd),
-        Some(approval_policy),
-        Some(sandbox_policy),
-        // Shell is not configurable from turn to turn
-        None,
-    ))])
-    .await;
-    if let Err(items) = sess.inject_input(items) {
-        // no current task, spawn a new one
-        let task = AgentTask::spawn(Arc::clone(sess), Arc::clone(turn_context), sub_id, items);
-        sess.set_task(task);
-    }
-}
-
 fn format_exec_output_str(exec_output: &ExecToolCallOutput) -> String {
     let ExecToolCallOutput {
         aggregated_output, ..
@@ -3034,21 +2964,13 @@ async fn drain_to_completed(
                 response_id: _,
                 token_usage,
             }) => {
-                let info = {
-                    let mut st = sess.state.lock_unchecked();
-                    let info = TokenUsageInfo::new_or_append(
-                        &st.token_info,
-                        &token_usage,
-                        turn_context.client.get_model_context_window(),
-                    );
-                    st.token_info = info.clone();
-                    info
-                };
-
+                // some providers don't return token usage, so we default
+                // TODO: consider approximate token usage
+                let token_usage = token_usage.unwrap_or_default();
                 sess.tx_event
                     .send(Event {
                         id: sub_id.to_string(),
-                        msg: EventMsg::TokenCount(crate::protocol::TokenCountEvent { info }),
+                        msg: EventMsg::TokenCount(token_usage),
                     })
                     .await
                     .ok();

codex-rs/core/src/config.rs

@@ -38,7 +38,9 @@ const OPENAI_DEFAULT_MODEL: &str = "gpt-5";
 /// the context window.
 pub(crate) const PROJECT_DOC_MAX_BYTES: usize = 32 * 1024; // 32 KiB
 
-pub(crate) const CONFIG_TOML_FILE: &str = "config.toml";
+const CONFIG_TOML_FILE: &str = "config.toml";
+
+const DEFAULT_RESPONSES_ORIGINATOR_HEADER: &str = "codex_cli_rs";
 
 /// Application configuration loaded from disk and merged with overrides.
 #[derive(Debug, Clone, PartialEq)]
@@ -167,20 +169,16 @@ pub struct Config {
 
     pub tools_web_search_request: bool,
 
+    /// The value for the `originator` header included with Responses API requests.
+    pub responses_originator_header: String,
+
     /// If set to `true`, the API key will be signed with the `originator` header.
     pub preferred_auth_method: AuthMode,
 
     pub use_experimental_streamable_shell_tool: bool,
 
-    /// If set to `true`, used only the experimental unified exec tool.
-    pub use_experimental_unified_exec_tool: bool,
-
     /// Include the `view_image` tool that lets the agent attach a local image path to context.
     pub include_view_image_tool: bool,
-
-    /// The active profile name used to derive this `Config` (if any).
-    pub active_profile: Option<String>,
-
     /// When true, disables burst-paste detection for typed input entirely.
     /// All characters are inserted as they are received, and no buffering
     /// or placeholder replacement will occur for fast keypress bursts.
@@ -264,7 +262,17 @@ pub fn load_config_as_toml(codex_home: &Path) -> std::io::Result<TomlValue> {
     }
 }
 
-fn set_project_trusted_inner(doc: &mut DocumentMut, project_path: &Path) -> anyhow::Result<()> {
+/// Patch `CODEX_HOME/config.toml` project state.
+/// Use with caution.
+pub fn set_project_trusted(codex_home: &Path, project_path: &Path) -> anyhow::Result<()> {
+    let config_path = codex_home.join(CONFIG_TOML_FILE);
+    // Parse existing config if present; otherwise start a new document.
+    let mut doc = match std::fs::read_to_string(config_path.clone()) {
+        Ok(s) => s.parse::<DocumentMut>()?,
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => DocumentMut::new(),
+        Err(e) => return Err(e.into()),
+    };
+
     // Ensure we render a human-friendly structure:
     //
     // [projects]
@@ -280,26 +288,14 @@ fn set_project_trusted_inner(doc: &mut DocumentMut, project_path: &Path) -> anyh
     // Ensure top-level `projects` exists as a non-inline, explicit table. If it
     // exists but was previously represented as a non-table (e.g., inline),
     // replace it with an explicit table.
+    let mut created_projects_table = false;
     {
         let root = doc.as_table_mut();
-        // If `projects` exists but isn't a standard table (e.g., it's an inline table),
-        // convert it to an explicit table while preserving existing entries.
-        let existing_projects = root.get("projects").cloned();
-        if existing_projects.as_ref().is_none_or(|i| !i.is_table()) {
-            let mut projects_tbl = toml_edit::Table::new();
-            projects_tbl.set_implicit(true);
-
-            // If there was an existing inline table, migrate its entries to explicit tables.
-            if let Some(inline_tbl) = existing_projects.as_ref().and_then(|i| i.as_inline_table()) {
-                for (k, v) in inline_tbl.iter() {
-                    if let Some(inner_tbl) = v.as_inline_table() {
-                        let new_tbl = inner_tbl.clone().into_table();
-                        projects_tbl.insert(k, toml_edit::Item::Table(new_tbl));
-                    }
-                }
-            }
-
-            root.insert("projects", toml_edit::Item::Table(projects_tbl));
+        let needs_table = !root.contains_key("projects")
+            || root.get("projects").and_then(|i| i.as_table()).is_none();
+        if needs_table {
+            root.insert("projects", toml_edit::table());
+            created_projects_table = true;
         }
     }
     let Some(projects_tbl) = doc["projects"].as_table_mut() else {
@@ -308,6 +304,12 @@ fn set_project_trusted_inner(doc: &mut DocumentMut, project_path: &Path) -> anyh
         ));
     };
 
+    // If we created the `projects` table ourselves, keep it implicit so we
+    // don't render a standalone `[projects]` header.
+    if created_projects_table {
+        projects_tbl.set_implicit(true);
+    }
+
     // Ensure the per-project entry is its own explicit table. If it exists but
     // is not a table (e.g., an inline table), replace it with an explicit table.
     let needs_proj_table = !projects_tbl.contains_key(project_key.as_str())
@@ -326,21 +328,6 @@ fn set_project_trusted_inner(doc: &mut DocumentMut, project_path: &Path) -> anyh
     };
     proj_tbl.set_implicit(false);
     proj_tbl["trust_level"] = toml_edit::value("trusted");
-    Ok(())
-}
-
-/// Patch `CODEX_HOME/config.toml` project state.
-/// Use with caution.
-pub fn set_project_trusted(codex_home: &Path, project_path: &Path) -> anyhow::Result<()> {
-    let config_path = codex_home.join(CONFIG_TOML_FILE);
-    // Parse existing config if present; otherwise start a new document.
-    let mut doc = match std::fs::read_to_string(config_path.clone()) {
-        Ok(s) => s.parse::<DocumentMut>()?,
-        Err(e) if e.kind() == std::io::ErrorKind::NotFound => DocumentMut::new(),
-        Err(e) => return Err(e.into()),
-    };
-
-    set_project_trusted_inner(&mut doc, project_path)?;
 
     // ensure codex_home exists
     std::fs::create_dir_all(codex_home)?;
@@ -490,7 +477,9 @@ pub struct ConfigToml {
     pub experimental_instructions_file: Option<PathBuf>,
 
     pub experimental_use_exec_command_tool: Option<bool>,
-    pub experimental_use_unified_exec_tool: Option<bool>,
+
+    /// The value for the `originator` header included with Responses API requests.
+    pub responses_originator_header_internal_override: Option<String>,
 
     pub projects: Option<HashMap<String, ProjectConfig>>,
 
@@ -672,11 +661,7 @@ impl Config {
             tools_web_search_request: override_tools_web_search_request,
         } = overrides;
 
-        let active_profile_name = config_profile_key
-            .as_ref()
-            .or(cfg.profile.as_ref())
-            .cloned();
-        let config_profile = match active_profile_name.as_ref() {
+        let config_profile = match config_profile_key.as_ref().or(cfg.profile.as_ref()) {
             Some(key) => cfg
                 .profiles
                 .get(key)
@@ -788,6 +773,10 @@ impl Config {
             Self::get_base_instructions(experimental_instructions_path, &resolved_cwd)?;
         let base_instructions = base_instructions.or(file_base_instructions);
 
+        let responses_originator_header: String = cfg
+            .responses_originator_header_internal_override
+            .unwrap_or(DEFAULT_RESPONSES_ORIGINATOR_HEADER.to_owned());
+
         let config = Self {
             model,
             model_family,
@@ -837,15 +826,12 @@ impl Config {
             include_plan_tool: include_plan_tool.unwrap_or(false),
             include_apply_patch_tool: include_apply_patch_tool.unwrap_or(false),
             tools_web_search_request,
+            responses_originator_header,
             preferred_auth_method: cfg.preferred_auth_method.unwrap_or(AuthMode::ChatGPT),
             use_experimental_streamable_shell_tool: cfg
                 .experimental_use_exec_command_tool
                 .unwrap_or(false),
-            use_experimental_unified_exec_tool: cfg
-                .experimental_use_unified_exec_tool
-                .unwrap_or(true),
             include_view_image_tool,
-            active_profile: active_profile_name,
             disable_paste_burst: cfg.disable_paste_burst.unwrap_or(false),
         };
         Ok(config)
@@ -1217,11 +1203,10 @@ model_verbosity = "high"
                 include_plan_tool: false,
                 include_apply_patch_tool: false,
                 tools_web_search_request: false,
+                responses_originator_header: "codex_cli_rs".to_string(),
                 preferred_auth_method: AuthMode::ChatGPT,
                 use_experimental_streamable_shell_tool: false,
-                use_experimental_unified_exec_tool: true,
                 include_view_image_tool: true,
-                active_profile: Some("o3".to_string()),
                 disable_paste_burst: false,
             },
             o3_profile_config
@@ -1275,11 +1260,10 @@ model_verbosity = "high"
             include_plan_tool: false,
             include_apply_patch_tool: false,
             tools_web_search_request: false,
+            responses_originator_header: "codex_cli_rs".to_string(),
             preferred_auth_method: AuthMode::ChatGPT,
             use_experimental_streamable_shell_tool: false,
-            use_experimental_unified_exec_tool: true,
             include_view_image_tool: true,
-            active_profile: Some("gpt3".to_string()),
             disable_paste_burst: false,
         };
 
@@ -1348,11 +1332,10 @@ model_verbosity = "high"
             include_plan_tool: false,
             include_apply_patch_tool: false,
             tools_web_search_request: false,
+            responses_originator_header: "codex_cli_rs".to_string(),
             preferred_auth_method: AuthMode::ChatGPT,
             use_experimental_streamable_shell_tool: false,
-            use_experimental_unified_exec_tool: true,
             include_view_image_tool: true,
-            active_profile: Some("zdr".to_string()),
             disable_paste_burst: false,
         };
 
@@ -1407,11 +1390,10 @@ model_verbosity = "high"
             include_plan_tool: false,
             include_apply_patch_tool: false,
             tools_web_search_request: false,
+            responses_originator_header: "codex_cli_rs".to_string(),
             preferred_auth_method: AuthMode::ChatGPT,
             use_experimental_streamable_shell_tool: false,
-            use_experimental_unified_exec_tool: true,
             include_view_image_tool: true,
-            active_profile: Some("gpt5".to_string()),
             disable_paste_burst: false,
         };
 
@@ -1422,14 +1404,17 @@ model_verbosity = "high"
 
     #[test]
     fn test_set_project_trusted_writes_explicit_tables() -> anyhow::Result<()> {
-        let project_dir = Path::new("/some/path");
-        let mut doc = DocumentMut::new();
+        let codex_home = TempDir::new().unwrap();
+        let project_dir = TempDir::new().unwrap();
 
-        set_project_trusted_inner(&mut doc, project_dir)?;
+        // Call the function under test
+        set_project_trusted(codex_home.path(), project_dir.path())?;
 
-        let contents = doc.to_string();
+        // Read back the generated config.toml and assert exact contents
+        let config_path = codex_home.path().join(CONFIG_TOML_FILE);
+        let contents = std::fs::read_to_string(&config_path)?;
 
-        let raw_path = project_dir.to_string_lossy();
+        let raw_path = project_dir.path().to_string_lossy();
         let path_str = if raw_path.contains('\\') {
             format!("'{raw_path}'")
         } else {
@@ -1447,10 +1432,12 @@ trust_level = "trusted"
 
     #[test]
     fn test_set_project_trusted_converts_inline_to_explicit() -> anyhow::Result<()> {
-        let project_dir = Path::new("/some/path");
+        let codex_home = TempDir::new().unwrap();
+        let project_dir = TempDir::new().unwrap();
 
         // Seed config.toml with an inline project entry under [projects]
-        let raw_path = project_dir.to_string_lossy();
+        let config_path = codex_home.path().join(CONFIG_TOML_FILE);
+        let raw_path = project_dir.path().to_string_lossy();
         let path_str = if raw_path.contains('\\') {
             format!("'{raw_path}'")
         } else {
@@ -1462,12 +1449,13 @@ trust_level = "trusted"
 {path_str} = {{ trust_level = "untrusted" }}
 "#
         );
-        let mut doc = initial.parse::<DocumentMut>()?;
+        std::fs::create_dir_all(codex_home.path())?;
+        std::fs::write(&config_path, initial)?;
 
         // Run the function; it should convert to explicit tables and set trusted
-        set_project_trusted_inner(&mut doc, project_dir)?;
+        set_project_trusted(codex_home.path(), project_dir.path())?;
 
-        let contents = doc.to_string();
+        let contents = std::fs::read_to_string(&config_path)?;
 
         // Assert exact output after conversion to explicit table
         let expected = format!(
@@ -1482,37 +1470,5 @@ trust_level = "trusted"
         Ok(())
     }
 
-    #[test]
-    fn test_set_project_trusted_migrates_top_level_inline_projects_preserving_entries()
-    -> anyhow::Result<()> {
-        let initial = r#"toplevel = "baz"
-projects = { "/Users/mbolin/code/codex4" = { trust_level = "trusted", foo = "bar" } , "/Users/mbolin/code/codex3" = { trust_level = "trusted" } }
-model = "foo""#;
-        let mut doc = initial.parse::<DocumentMut>()?;
-
-        // Approve a new directory
-        let new_project = Path::new("/Users/mbolin/code/codex2");
-        set_project_trusted_inner(&mut doc, new_project)?;
-
-        let contents = doc.to_string();
-
-        // Since we created the [projects] table as part of migration, it is kept implicit.
-        // Expect explicit per-project tables, preserving prior entries and appending the new one.
-        let expected = r#"toplevel = "baz"
-model = "foo"
-
-[projects."/Users/mbolin/code/codex4"]
-trust_level = "trusted"
-foo = "bar"
-
-[projects."/Users/mbolin/code/codex3"]
-trust_level = "trusted"
-
-[projects."/Users/mbolin/code/codex2"]
-trust_level = "trusted"
-"#;
-        assert_eq!(contents, expected);
-
-        Ok(())
-    }
+    // No test enforcing the presence of a standalone [projects] header.
 }

codex-rs/core/src/config_edit.rs

@@ -1,582 +0,0 @@
-use crate::config::CONFIG_TOML_FILE;
-use anyhow::Result;
-use std::path::Path;
-use tempfile::NamedTempFile;
-use toml_edit::DocumentMut;
-
-pub const CONFIG_KEY_MODEL: &str = "model";
-pub const CONFIG_KEY_EFFORT: &str = "model_reasoning_effort";
-
-/// Persist overrides into `config.toml` using explicit key segments per
-/// override. This avoids ambiguity with keys that contain dots or spaces.
-pub async fn persist_overrides(
-    codex_home: &Path,
-    profile: Option<&str>,
-    overrides: &[(&[&str], &str)],
-) -> Result<()> {
-    let config_path = codex_home.join(CONFIG_TOML_FILE);
-
-    let mut doc = match tokio::fs::read_to_string(&config_path).await {
-        Ok(s) => s.parse::<DocumentMut>()?,
-        Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
-            tokio::fs::create_dir_all(codex_home).await?;
-            DocumentMut::new()
-        }
-        Err(e) => return Err(e.into()),
-    };
-
-    let effective_profile = if let Some(p) = profile {
-        Some(p.to_owned())
-    } else {
-        doc.get("profile")
-            .and_then(|i| i.as_str())
-            .map(|s| s.to_string())
-    };
-
-    for (segments, val) in overrides.iter().copied() {
-        let value = toml_edit::value(val);
-        if let Some(ref name) = effective_profile {
-            if segments.first().copied() == Some("profiles") {
-                apply_toml_edit_override_segments(&mut doc, segments, value);
-            } else {
-                let mut seg_buf: Vec<&str> = Vec::with_capacity(2 + segments.len());
-                seg_buf.push("profiles");
-                seg_buf.push(name.as_str());
-                seg_buf.extend_from_slice(segments);
-                apply_toml_edit_override_segments(&mut doc, &seg_buf, value);
-            }
-        } else {
-            apply_toml_edit_override_segments(&mut doc, segments, value);
-        }
-    }
-
-    let tmp_file = NamedTempFile::new_in(codex_home)?;
-    tokio::fs::write(tmp_file.path(), doc.to_string()).await?;
-    tmp_file.persist(config_path)?;
-
-    Ok(())
-}
-
-/// Persist overrides where values may be optional. Any entries with `None`
-/// values are skipped. If all values are `None`, this becomes a no-op and
-/// returns `Ok(())` without touching the file.
-pub async fn persist_non_null_overrides(
-    codex_home: &Path,
-    profile: Option<&str>,
-    overrides: &[(&[&str], Option<&str>)],
-) -> Result<()> {
-    let filtered: Vec<(&[&str], &str)> = overrides
-        .iter()
-        .filter_map(|(k, v)| v.map(|vv| (*k, vv)))
-        .collect();
-
-    if filtered.is_empty() {
-        return Ok(());
-    }
-
-    persist_overrides(codex_home, profile, &filtered).await
-}
-
-/// Apply a single override onto a `toml_edit` document while preserving
-/// existing formatting/comments.
-/// The key is expressed as explicit segments to correctly handle keys that
-/// contain dots or spaces.
-fn apply_toml_edit_override_segments(
-    doc: &mut DocumentMut,
-    segments: &[&str],
-    value: toml_edit::Item,
-) {
-    use toml_edit::Item;
-
-    if segments.is_empty() {
-        return;
-    }
-
-    let mut current = doc.as_table_mut();
-    for seg in &segments[..segments.len() - 1] {
-        if !current.contains_key(seg) {
-            current[*seg] = Item::Table(toml_edit::Table::new());
-            if let Some(t) = current[*seg].as_table_mut() {
-                t.set_implicit(true);
-            }
-        }
-
-        let maybe_item = current.get_mut(seg);
-        let Some(item) = maybe_item else { return };
-
-        if !item.is_table() {
-            *item = Item::Table(toml_edit::Table::new());
-            if let Some(t) = item.as_table_mut() {
-                t.set_implicit(true);
-            }
-        }
-
-        let Some(tbl) = item.as_table_mut() else {
-            return;
-        };
-        current = tbl;
-    }
-
-    let last = segments[segments.len() - 1];
-    current[last] = value;
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use pretty_assertions::assert_eq;
-    use tempfile::tempdir;
-
-    /// Verifies model and effort are written at top-level when no profile is set.
-    #[tokio::test]
-    async fn set_default_model_and_effort_top_level_when_no_profile() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        persist_overrides(
-            codex_home,
-            None,
-            &[
-                (&[CONFIG_KEY_MODEL], "gpt-5"),
-                (&[CONFIG_KEY_EFFORT], "high"),
-            ],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"model = "gpt-5"
-model_reasoning_effort = "high"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies values are written under the active profile when `profile` is set.
-    #[tokio::test]
-    async fn set_defaults_update_profile_when_profile_set() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Seed config with a profile selection but without profiles table
-        let seed = "profile = \"o3\"\n";
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        persist_overrides(
-            codex_home,
-            None,
-            &[
-                (&[CONFIG_KEY_MODEL], "o3"),
-                (&[CONFIG_KEY_EFFORT], "minimal"),
-            ],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"profile = "o3"
-
-[profiles.o3]
-model = "o3"
-model_reasoning_effort = "minimal"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies profile names with dots/spaces are preserved via explicit segments.
-    #[tokio::test]
-    async fn set_defaults_update_profile_with_dot_and_space() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Seed config with a profile name that contains a dot and a space
-        let seed = "profile = \"my.team name\"\n";
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        persist_overrides(
-            codex_home,
-            None,
-            &[
-                (&[CONFIG_KEY_MODEL], "o3"),
-                (&[CONFIG_KEY_EFFORT], "minimal"),
-            ],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"profile = "my.team name"
-
-[profiles."my.team name"]
-model = "o3"
-model_reasoning_effort = "minimal"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies explicit profile override writes under that profile even without active profile.
-    #[tokio::test]
-    async fn set_defaults_update_when_profile_override_supplied() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // No profile key in config.toml
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), "")
-            .await
-            .expect("seed write");
-
-        // Persist with an explicit profile override
-        persist_overrides(
-            codex_home,
-            Some("o3"),
-            &[(&[CONFIG_KEY_MODEL], "o3"), (&[CONFIG_KEY_EFFORT], "high")],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"[profiles.o3]
-model = "o3"
-model_reasoning_effort = "high"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies nested tables are created as needed when applying overrides.
-    #[tokio::test]
-    async fn persist_overrides_creates_nested_tables() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        persist_overrides(
-            codex_home,
-            None,
-            &[
-                (&["a", "b", "c"], "v"),
-                (&["x"], "y"),
-                (&["profiles", "p1", CONFIG_KEY_MODEL], "gpt-5"),
-            ],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"x = "y"
-
-[a.b]
-c = "v"
-
-[profiles.p1]
-model = "gpt-5"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies a scalar key becomes a table when nested keys are written.
-    #[tokio::test]
-    async fn persist_overrides_replaces_scalar_with_table() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-        let seed = "foo = \"bar\"\n";
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        persist_overrides(codex_home, None, &[(&["foo", "bar", "baz"], "ok")])
-            .await
-            .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"[foo.bar]
-baz = "ok"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies comments and spacing are preserved when writing under active profile.
-    #[tokio::test]
-    async fn set_defaults_preserve_comments() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Seed a config with comments and spacing we expect to preserve
-        let seed = r#"# Global comment
-# Another line
-
-profile = "o3"
-
-# Profile settings
-[profiles.o3]
-# keep me
-existing = "keep"
-"#;
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        // Apply defaults; since profile is set, it should write under [profiles.o3]
-        persist_overrides(
-            codex_home,
-            None,
-            &[(&[CONFIG_KEY_MODEL], "o3"), (&[CONFIG_KEY_EFFORT], "high")],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"# Global comment
-# Another line
-
-profile = "o3"
-
-# Profile settings
-[profiles.o3]
-# keep me
-existing = "keep"
-model = "o3"
-model_reasoning_effort = "high"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies comments and spacing are preserved when writing at top level.
-    #[tokio::test]
-    async fn set_defaults_preserve_global_comments() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Seed a config WITHOUT a profile, containing comments and spacing
-        let seed = r#"# Top-level comments
-# should be preserved
-
-existing = "keep"
-"#;
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        // Since there is no profile, the defaults should be written at top-level
-        persist_overrides(
-            codex_home,
-            None,
-            &[
-                (&[CONFIG_KEY_MODEL], "gpt-5"),
-                (&[CONFIG_KEY_EFFORT], "minimal"),
-            ],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"# Top-level comments
-# should be preserved
-
-existing = "keep"
-model = "gpt-5"
-model_reasoning_effort = "minimal"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies errors on invalid TOML propagate and file is not clobbered.
-    #[tokio::test]
-    async fn persist_overrides_errors_on_parse_failure() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Write an intentionally invalid TOML file
-        let invalid = "invalid = [unclosed";
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), invalid)
-            .await
-            .expect("seed write");
-
-        // Attempting to persist should return an error and must not clobber the file.
-        let res = persist_overrides(codex_home, None, &[(&["x"], "y")]).await;
-        assert!(res.is_err(), "expected parse error to propagate");
-
-        // File should be unchanged
-        let contents = read_config(codex_home).await;
-        assert_eq!(contents, invalid);
-    }
-
-    /// Verifies changing model only preserves existing effort at top-level.
-    #[tokio::test]
-    async fn changing_only_model_preserves_existing_effort_top_level() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Seed with an effort value only
-        let seed = "model_reasoning_effort = \"minimal\"\n";
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        // Change only the model
-        persist_overrides(codex_home, None, &[(&[CONFIG_KEY_MODEL], "o3")])
-            .await
-            .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"model_reasoning_effort = "minimal"
-model = "o3"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies changing effort only preserves existing model at top-level.
-    #[tokio::test]
-    async fn changing_only_effort_preserves_existing_model_top_level() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Seed with a model value only
-        let seed = "model = \"gpt-5\"\n";
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        // Change only the effort
-        persist_overrides(codex_home, None, &[(&[CONFIG_KEY_EFFORT], "high")])
-            .await
-            .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"model = "gpt-5"
-model_reasoning_effort = "high"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies changing model only preserves existing effort in active profile.
-    #[tokio::test]
-    async fn changing_only_model_preserves_effort_in_active_profile() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // Seed with an active profile and an existing effort under that profile
-        let seed = r#"profile = "p1"
-
-[profiles.p1]
-model_reasoning_effort = "low"
-"#;
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        persist_overrides(codex_home, None, &[(&[CONFIG_KEY_MODEL], "o4-mini")])
-            .await
-            .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"profile = "p1"
-
-[profiles.p1]
-model_reasoning_effort = "low"
-model = "o4-mini"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies changing effort only preserves existing model in a profile override.
-    #[tokio::test]
-    async fn changing_only_effort_preserves_model_in_profile_override() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        // No active profile key; we'll target an explicit override
-        let seed = r#"[profiles.team]
-model = "gpt-5"
-"#;
-        tokio::fs::write(codex_home.join(CONFIG_TOML_FILE), seed)
-            .await
-            .expect("seed write");
-
-        persist_overrides(
-            codex_home,
-            Some("team"),
-            &[(&[CONFIG_KEY_EFFORT], "minimal")],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"[profiles.team]
-model = "gpt-5"
-model_reasoning_effort = "minimal"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies `persist_non_null_overrides` skips `None` entries and writes only present values at top-level.
-    #[tokio::test]
-    async fn persist_non_null_skips_none_top_level() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        persist_non_null_overrides(
-            codex_home,
-            None,
-            &[
-                (&[CONFIG_KEY_MODEL], Some("gpt-5")),
-                (&[CONFIG_KEY_EFFORT], None),
-            ],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = "model = \"gpt-5\"\n";
-        assert_eq!(contents, expected);
-    }
-
-    /// Verifies no-op behavior when all provided overrides are `None` (no file created/modified).
-    #[tokio::test]
-    async fn persist_non_null_noop_when_all_none() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        persist_non_null_overrides(
-            codex_home,
-            None,
-            &[(&["a"], None), (&["profiles", "p", "x"], None)],
-        )
-        .await
-        .expect("persist");
-
-        // Should not create config.toml on a pure no-op
-        assert!(!codex_home.join(CONFIG_TOML_FILE).exists());
-    }
-
-    /// Verifies entries are written under the specified profile and `None` entries are skipped.
-    #[tokio::test]
-    async fn persist_non_null_respects_profile_override() {
-        let tmpdir = tempdir().expect("tmp");
-        let codex_home = tmpdir.path();
-
-        persist_non_null_overrides(
-            codex_home,
-            Some("team"),
-            &[
-                (&[CONFIG_KEY_MODEL], Some("o3")),
-                (&[CONFIG_KEY_EFFORT], None),
-            ],
-        )
-        .await
-        .expect("persist");
-
-        let contents = read_config(codex_home).await;
-        let expected = r#"[profiles.team]
-model = "o3"
-"#;
-        assert_eq!(contents, expected);
-    }
-
-    // Test helper moved to bottom per review guidance.
-    async fn read_config(codex_home: &Path) -> String {
-        let p = codex_home.join(CONFIG_TOML_FILE);
-        tokio::fs::read_to_string(p).await.unwrap_or_default()
-    }
-}

codex-rs/core/src/config_types.rs

@@ -18,10 +18,6 @@ pub struct McpServerConfig {
 
     #[serde(default)]
     pub env: Option<HashMap<String, String>>,
-
-    /// Startup timeout in milliseconds for initializing MCP server & initially listing tools.
-    #[serde(default)]
-    pub startup_timeout_ms: Option<u64>,
 }
 
 #[derive(Deserialize, Debug, Copy, Clone, PartialEq)]

codex-rs/core/src/conversation_history.rs

@@ -71,6 +71,7 @@ fn is_api_message(message: &ResponseItem) -> bool {
         | ResponseItem::CustomToolCall { .. }
         | ResponseItem::CustomToolCallOutput { .. }
         | ResponseItem::LocalShellCall { .. }
+        | ResponseItem::UnifiedExec { .. }
         | ResponseItem::Reasoning { .. } => true,
         ResponseItem::WebSearchCall { .. } | ResponseItem::Other => false,
     }

codex-rs/core/src/conversation_manager.rs

@@ -1,5 +1,12 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::sync::Arc;
+
 use crate::AuthManager;
 use crate::CodexAuth;
+use tokio::sync::RwLock;
+use uuid::Uuid;
+
 use crate::codex::Codex;
 use crate::codex::CodexSpawnOk;
 use crate::codex::INITIAL_SUBMIT_ID;
@@ -11,19 +18,18 @@ use crate::protocol::Event;
 use crate::protocol::EventMsg;
 use crate::protocol::SessionConfiguredEvent;
 use crate::rollout::RolloutRecorder;
-use codex_protocol::mcp_protocol::ConversationId;
 use codex_protocol::models::ResponseItem;
-use codex_protocol::protocol::InitialHistory;
-use codex_protocol::protocol::RolloutItem;
-use std::collections::HashMap;
-use std::path::PathBuf;
-use std::sync::Arc;
-use tokio::sync::RwLock;
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum InitialHistory {
+    New,
+    Resumed(Vec<ResponseItem>),
+}
 
 /// Represents a newly created Codex conversation, including the first event
 /// (which is [`EventMsg::SessionConfigured`]).
 pub struct NewConversation {
-    pub conversation_id: ConversationId,
+    pub conversation_id: Uuid,
     pub conversation: Arc<CodexConversation>,
     pub session_configured: SessionConfiguredEvent,
 }
@@ -31,7 +37,7 @@ pub struct NewConversation {
 /// [`ConversationManager`] is responsible for creating conversations and
 /// maintaining them in memory.
 pub struct ConversationManager {
-    conversations: Arc<RwLock<HashMap<ConversationId, Arc<CodexConversation>>>>,
+    conversations: Arc<RwLock<HashMap<Uuid, Arc<CodexConversation>>>>,
     auth_manager: Arc<AuthManager>,
 }
 
@@ -64,14 +70,14 @@ impl ConversationManager {
             let initial_history = RolloutRecorder::get_rollout_history(resume_path).await?;
             let CodexSpawnOk {
                 codex,
-                conversation_id,
+                session_id: conversation_id,
             } = Codex::spawn(config, auth_manager, initial_history).await?;
             self.finalize_spawn(codex, conversation_id).await
         } else {
             let CodexSpawnOk {
                 codex,
-                conversation_id,
-            } = Codex::spawn(config, auth_manager, InitialHistory::New).await?;
+                session_id: conversation_id,
+            } = { Codex::spawn(config, auth_manager, InitialHistory::New).await? };
             self.finalize_spawn(codex, conversation_id).await
         }
     }
@@ -79,7 +85,7 @@ impl ConversationManager {
     async fn finalize_spawn(
         &self,
         codex: Codex,
-        conversation_id: ConversationId,
+        conversation_id: Uuid,
     ) -> CodexResult<NewConversation> {
         // The first event must be `SessionInitialized`. Validate and forward it
         // to the caller so that they can display it in the conversation
@@ -110,7 +116,7 @@ impl ConversationManager {
 
     pub async fn get_conversation(
         &self,
-        conversation_id: ConversationId,
+        conversation_id: Uuid,
     ) -> CodexResult<Arc<CodexConversation>> {
         let conversations = self.conversations.read().await;
         conversations
@@ -128,20 +134,13 @@ impl ConversationManager {
         let initial_history = RolloutRecorder::get_rollout_history(&rollout_path).await?;
         let CodexSpawnOk {
             codex,
-            conversation_id,
+            session_id: conversation_id,
         } = Codex::spawn(config, auth_manager, initial_history).await?;
         self.finalize_spawn(codex, conversation_id).await
     }
 
-    /// Removes the conversation from the manager's internal map, though the
-    /// conversation is stored as `Arc<CodexConversation>`, it is possible that
-    /// other references to it exist elsewhere. Returns the conversation if the
-    /// conversation was found and removed.
-    pub async fn remove_conversation(
-        &self,
-        conversation_id: &ConversationId,
-    ) -> Option<Arc<CodexConversation>> {
-        self.conversations.write().await.remove(conversation_id)
+    pub async fn remove_conversation(&self, conversation_id: Uuid) {
+        self.conversations.write().await.remove(&conversation_id);
     }
 
     /// Fork an existing conversation by dropping the last `drop_last_messages`
@@ -150,19 +149,19 @@ impl ConversationManager {
     /// caller's `config`). The new conversation will have a fresh id.
     pub async fn fork_conversation(
         &self,
+        conversation_history: Vec<ResponseItem>,
         num_messages_to_drop: usize,
         config: Config,
-        path: PathBuf,
     ) -> CodexResult<NewConversation> {
         // Compute the prefix up to the cut point.
-        let history = RolloutRecorder::get_rollout_history(&path).await?;
-        let history = truncate_after_dropping_last_messages(history, num_messages_to_drop);
+        let history =
+            truncate_after_dropping_last_messages(conversation_history, num_messages_to_drop);
 
         // Spawn a new conversation with the computed initial history.
         let auth_manager = self.auth_manager.clone();
         let CodexSpawnOk {
             codex,
-            conversation_id,
+            session_id: conversation_id,
         } = Codex::spawn(config, auth_manager, history).await?;
 
         self.finalize_spawn(codex, conversation_id).await
@@ -171,37 +170,31 @@ impl ConversationManager {
 
 /// Return a prefix of `items` obtained by dropping the last `n` user messages
 /// and all items that follow them.
-fn truncate_after_dropping_last_messages(history: InitialHistory, n: usize) -> InitialHistory {
+fn truncate_after_dropping_last_messages(items: Vec<ResponseItem>, n: usize) -> InitialHistory {
     if n == 0 {
-        return InitialHistory::Forked(history.get_rollout_items());
+        return InitialHistory::Resumed(items);
     }
 
-    // Work directly on rollout items, and cut the vector at the nth-from-last user message input.
-    let items: Vec<RolloutItem> = history.get_rollout_items();
-
-    // Find indices of user message inputs in rollout order.
-    let mut user_positions: Vec<usize> = Vec::new();
-    for (idx, item) in items.iter().enumerate() {
-        if let RolloutItem::ResponseItem(ResponseItem::Message { role, .. }) = item
+    // Walk backwards counting only `user` Message items, find cut index.
+    let mut count = 0usize;
+    let mut cut_index = 0usize;
+    for (idx, item) in items.iter().enumerate().rev() {
+        if let ResponseItem::Message { role, .. } = item
             && role == "user"
         {
-            user_positions.push(idx);
+            count += 1;
+            if count == n {
+                // Cut everything from this user message to the end.
+                cut_index = idx;
+                break;
+            }
         }
     }
-
-    // If fewer than n user messages exist, treat as empty.
-    if user_positions.len() < n {
-        return InitialHistory::New;
-    }
-
-    // Cut strictly before the nth-from-last user message (do not keep the nth itself).
-    let cut_idx = user_positions[user_positions.len() - n];
-    let rolled: Vec<RolloutItem> = items.into_iter().take(cut_idx).collect();
-
-    if rolled.is_empty() {
+    if cut_index == 0 {
+        // No prefix remains after dropping; start a new conversation.
         InitialHistory::New
     } else {
-        InitialHistory::Forked(rolled)
+        InitialHistory::Resumed(items.into_iter().take(cut_index).collect())
     }
 }
 
@@ -256,30 +249,13 @@ mod tests {
             assistant_msg("a4"),
         ];
 
-        // Wrap as InitialHistory::Forked with response items only.
-        let initial: Vec<RolloutItem> = items
-            .iter()
-            .cloned()
-            .map(RolloutItem::ResponseItem)
-            .collect();
-        let truncated = truncate_after_dropping_last_messages(InitialHistory::Forked(initial), 1);
-        let got_items = truncated.get_rollout_items();
-        let expected_items = vec![
-            RolloutItem::ResponseItem(items[0].clone()),
-            RolloutItem::ResponseItem(items[1].clone()),
-            RolloutItem::ResponseItem(items[2].clone()),
-        ];
+        let truncated = truncate_after_dropping_last_messages(items.clone(), 1);
         assert_eq!(
-            serde_json::to_value(&got_items).unwrap(),
-            serde_json::to_value(&expected_items).unwrap()
+            truncated,
+            InitialHistory::Resumed(vec![items[0].clone(), items[1].clone(), items[2].clone(),])
         );
 
-        let initial2: Vec<RolloutItem> = items
-            .iter()
-            .cloned()
-            .map(RolloutItem::ResponseItem)
-            .collect();
-        let truncated2 = truncate_after_dropping_last_messages(InitialHistory::Forked(initial2), 2);
-        assert!(matches!(truncated2, InitialHistory::New));
+        let truncated2 = truncate_after_dropping_last_messages(items, 2);
+        assert_eq!(truncated2, InitialHistory::New);
     }
 }

codex-rs/core/src/default_client.rs

@@ -1,123 +1,38 @@
-use reqwest::header::HeaderValue;
-use std::sync::LazyLock;
-use std::sync::Mutex;
+pub const DEFAULT_ORIGINATOR: &str = "codex_cli_rs";
 
-/// Set this to add a suffix to the User-Agent string.
-///
-/// It is not ideal that we're using a global singleton for this.
-/// This is primarily designed to differentiate MCP clients from each other.
-/// Because there can only be one MCP server per process, it should be safe for this to be a global static.
-/// However, future users of this should use this with caution as a result.
-/// In addition, we want to be confident that this value is used for ALL clients and doing that requires a
-/// lot of wiring and it's easy to miss code paths by doing so.
-/// See https://github.com/openai/codex/pull/3388/files for an example of what that would look like.
-/// Finally, we want to make sure this is set for ALL mcp clients without needing to know a special env var
-/// or having to set data that they already specified in the mcp initialize request somewhere else.
-///
-/// A space is automatically added between the suffix and the rest of the User-Agent string.
-/// The full user agent string is returned from the mcp initialize response.
-/// Parenthesis will be added by Codex. This should only specify what goes inside of the parenthesis.
-pub static USER_AGENT_SUFFIX: LazyLock<Mutex<Option<String>>> = LazyLock::new(|| Mutex::new(None));
-
-pub const CODEX_INTERNAL_ORIGINATOR_OVERRIDE_ENV_VAR: &str = "CODEX_INTERNAL_ORIGINATOR_OVERRIDE";
-
-#[derive(Debug, Clone)]
-pub struct Originator {
-    pub value: String,
-    pub header_value: HeaderValue,
-}
-
-pub static ORIGINATOR: LazyLock<Originator> = LazyLock::new(|| {
-    let default = "codex_cli_rs";
-    let value = std::env::var(CODEX_INTERNAL_ORIGINATOR_OVERRIDE_ENV_VAR)
-        .unwrap_or_else(|_| default.to_string());
-
-    match HeaderValue::from_str(&value) {
-        Ok(header_value) => Originator {
-            value,
-            header_value,
-        },
-        Err(e) => {
-            tracing::error!("Unable to turn originator override {value} into header value: {e}");
-            Originator {
-                value: default.to_string(),
-                header_value: HeaderValue::from_static(default),
-            }
-        }
-    }
-});
-
-pub fn get_codex_user_agent() -> String {
+pub fn get_codex_user_agent(originator: Option<&str>) -> String {
     let build_version = env!("CARGO_PKG_VERSION");
     let os_info = os_info::get();
-    let prefix = format!(
+    format!(
         "{}/{build_version} ({} {}; {}) {}",
-        ORIGINATOR.value.as_str(),
+        originator.unwrap_or(DEFAULT_ORIGINATOR),
         os_info.os_type(),
         os_info.version(),
         os_info.architecture().unwrap_or("unknown"),
         crate::terminal::user_agent()
-    );
-    let suffix = USER_AGENT_SUFFIX
-        .lock()
-        .ok()
-        .and_then(|guard| guard.clone());
-    let suffix = suffix
-        .as_deref()
-        .map(str::trim)
-        .filter(|value| !value.is_empty())
-        .map_or_else(String::new, |value| format!(" ({value})"));
-
-    let candidate = format!("{prefix}{suffix}");
-    sanitize_user_agent(candidate, &prefix)
-}
-
-/// Sanitize the user agent string.
-///
-/// Invalid characters are replaced with an underscore.
-///
-/// If the user agent fails to parse, it falls back to fallback and then to ORIGINATOR.
-fn sanitize_user_agent(candidate: String, fallback: &str) -> String {
-    if HeaderValue::from_str(candidate.as_str()).is_ok() {
-        return candidate;
-    }
-
-    let sanitized: String = candidate
-        .chars()
-        .map(|ch| if matches!(ch, ' '..='~') { ch } else { '_' })
-        .collect();
-    if !sanitized.is_empty() && HeaderValue::from_str(sanitized.as_str()).is_ok() {
-        tracing::warn!(
-            "Sanitized Codex user agent because provided suffix contained invalid header characters"
-        );
-        sanitized
-    } else if HeaderValue::from_str(fallback).is_ok() {
-        tracing::warn!(
-            "Falling back to base Codex user agent because provided suffix could not be sanitized"
-        );
-        fallback.to_string()
-    } else {
-        tracing::warn!(
-            "Falling back to default Codex originator because base user agent string is invalid"
-        );
-        ORIGINATOR.value.clone()
-    }
+    )
 }
 
 /// Create a reqwest client with default `originator` and `User-Agent` headers set.
-pub fn create_client() -> reqwest::Client {
+pub fn create_client(originator: &str) -> reqwest::Client {
     use reqwest::header::HeaderMap;
+    use reqwest::header::HeaderValue;
 
     let mut headers = HeaderMap::new();
-    headers.insert("originator", ORIGINATOR.header_value.clone());
-    let ua = get_codex_user_agent();
+    let originator_value = HeaderValue::from_str(originator)
+        .unwrap_or_else(|_| HeaderValue::from_static(DEFAULT_ORIGINATOR));
+    headers.insert("originator", originator_value);
+    let ua = get_codex_user_agent(Some(originator));
 
-    reqwest::Client::builder()
+    match reqwest::Client::builder()
         // Set UA via dedicated helper to avoid header validation pitfalls
         .user_agent(ua)
         .default_headers(headers)
         .build()
-        .unwrap_or_else(|_| reqwest::Client::new())
+    {
+        Ok(client) => client,
+        Err(_) => reqwest::Client::new(),
+    }
 }
 
 #[cfg(test)]
@@ -126,7 +41,7 @@ mod tests {
 
     #[test]
     fn test_get_codex_user_agent() {
-        let user_agent = get_codex_user_agent();
+        let user_agent = get_codex_user_agent(None);
         assert!(user_agent.starts_with("codex_cli_rs/"));
     }
 
@@ -138,7 +53,8 @@ mod tests {
         use wiremock::matchers::method;
         use wiremock::matchers::path;
 
-        let client = create_client();
+        let originator = "test_originator";
+        let client = create_client(originator);
 
         // Spin up a local mock server and capture a request.
         let server = MockServer::start().await;
@@ -166,43 +82,21 @@ mod tests {
         let originator_header = headers
             .get("originator")
             .expect("originator header missing");
-        assert_eq!(originator_header.to_str().unwrap(), "codex_cli_rs");
+        assert_eq!(originator_header.to_str().unwrap(), originator);
 
         // User-Agent matches the computed Codex UA for that originator
-        let expected_ua = get_codex_user_agent();
+        let expected_ua = get_codex_user_agent(Some(originator));
         let ua_header = headers
             .get("user-agent")
             .expect("user-agent header missing");
         assert_eq!(ua_header.to_str().unwrap(), expected_ua);
     }
 
-    #[test]
-    fn test_invalid_suffix_is_sanitized() {
-        let prefix = "codex_cli_rs/0.0.0";
-        let suffix = "bad\rsuffix";
-
-        assert_eq!(
-            sanitize_user_agent(format!("{prefix} ({suffix})"), prefix),
-            "codex_cli_rs/0.0.0 (bad_suffix)"
-        );
-    }
-
-    #[test]
-    fn test_invalid_suffix_is_sanitized2() {
-        let prefix = "codex_cli_rs/0.0.0";
-        let suffix = "bad\0suffix";
-
-        assert_eq!(
-            sanitize_user_agent(format!("{prefix} ({suffix})"), prefix),
-            "codex_cli_rs/0.0.0 (bad_suffix)"
-        );
-    }
-
     #[test]
     #[cfg(target_os = "macos")]
     fn test_macos() {
         use regex_lite::Regex;
-        let user_agent = get_codex_user_agent();
+        let user_agent = get_codex_user_agent(None);
         let re = Regex::new(
             r"^codex_cli_rs/\d+\.\d+\.\d+ \(Mac OS \d+\.\d+\.\d+; (x86_64|arm64)\) (\S+)$",
         )

codex-rs/core/src/environment_context.rs

@@ -26,7 +26,6 @@ pub(crate) struct EnvironmentContext {
     pub approval_policy: Option<AskForApproval>,
     pub sandbox_mode: Option<SandboxMode>,
     pub network_access: Option<NetworkAccess>,
-    pub writable_roots: Option<Vec<PathBuf>>,
     pub shell: Option<Shell>,
 }
 
@@ -58,16 +57,6 @@ impl EnvironmentContext {
                 }
                 None => None,
             },
-            writable_roots: match sandbox_policy {
-                Some(SandboxPolicy::WorkspaceWrite { writable_roots, .. }) => {
-                    if writable_roots.is_empty() {
-                        None
-                    } else {
-                        Some(writable_roots.clone())
-                    }
-                }
-                _ => None,
-            },
             shell,
         }
     }
@@ -83,7 +72,6 @@ impl EnvironmentContext {
     ///   <cwd>...</cwd>
     ///   <approval_policy>...</approval_policy>
     ///   <sandbox_mode>...</sandbox_mode>
-    ///   <writable_roots>...</writable_roots>
     ///   <network_access>...</network_access>
     ///   <shell>...</shell>
     /// </environment_context>
@@ -106,16 +94,6 @@ impl EnvironmentContext {
                 "  <network_access>{network_access}</network_access>"
             ));
         }
-        if let Some(writable_roots) = self.writable_roots {
-            lines.push("  <writable_roots>".to_string());
-            for writable_root in writable_roots {
-                lines.push(format!(
-                    "    <root>{}</root>",
-                    writable_root.to_string_lossy()
-                ));
-            }
-            lines.push("  </writable_roots>".to_string());
-        }
         if let Some(shell) = self.shell
             && let Some(shell_name) = shell.name()
         {
@@ -137,77 +115,3 @@ impl From<EnvironmentContext> for ResponseItem {
         }
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use pretty_assertions::assert_eq;
-
-    fn workspace_write_policy(writable_roots: Vec<&str>, network_access: bool) -> SandboxPolicy {
-        SandboxPolicy::WorkspaceWrite {
-            writable_roots: writable_roots.into_iter().map(PathBuf::from).collect(),
-            network_access,
-            exclude_tmpdir_env_var: false,
-            exclude_slash_tmp: false,
-        }
-    }
-
-    #[test]
-    fn serialize_workspace_write_environment_context() {
-        let context = EnvironmentContext::new(
-            Some(PathBuf::from("/repo")),
-            Some(AskForApproval::OnRequest),
-            Some(workspace_write_policy(vec!["/repo", "/tmp"], false)),
-            None,
-        );
-
-        let expected = r#"<environment_context>
-  <cwd>/repo</cwd>
-  <approval_policy>on-request</approval_policy>
-  <sandbox_mode>workspace-write</sandbox_mode>
-  <network_access>restricted</network_access>
-  <writable_roots>
-    <root>/repo</root>
-    <root>/tmp</root>
-  </writable_roots>
-</environment_context>"#;
-
-        assert_eq!(context.serialize_to_xml(), expected);
-    }
-
-    #[test]
-    fn serialize_read_only_environment_context() {
-        let context = EnvironmentContext::new(
-            None,
-            Some(AskForApproval::Never),
-            Some(SandboxPolicy::ReadOnly),
-            None,
-        );
-
-        let expected = r#"<environment_context>
-  <approval_policy>never</approval_policy>
-  <sandbox_mode>read-only</sandbox_mode>
-  <network_access>restricted</network_access>
-</environment_context>"#;
-
-        assert_eq!(context.serialize_to_xml(), expected);
-    }
-
-    #[test]
-    fn serialize_full_access_environment_context() {
-        let context = EnvironmentContext::new(
-            None,
-            Some(AskForApproval::OnFailure),
-            Some(SandboxPolicy::DangerFullAccess),
-            None,
-        );
-
-        let expected = r#"<environment_context>
-  <approval_policy>on-failure</approval_policy>
-  <sandbox_mode>danger-full-access</sandbox_mode>
-  <network_access>enabled</network_access>
-</environment_context>"#;
-
-        assert_eq!(context.serialize_to_xml(), expected);
-    }
-}

codex-rs/core/src/error.rs

@@ -1,10 +1,10 @@
-use codex_protocol::mcp_protocol::ConversationId;
 use reqwest::StatusCode;
 use serde_json;
 use std::io;
 use std::time::Duration;
 use thiserror::Error;
 use tokio::task::JoinError;
+use uuid::Uuid;
 
 pub type Result<T> = std::result::Result<T, CodexErr>;
 
@@ -49,7 +49,7 @@ pub enum CodexErr {
     Stream(String, Option<Duration>),
 
     #[error("no conversation with id: {0}")]
-    ConversationNotFound(ConversationId),
+    ConversationNotFound(Uuid),
 
     #[error("session configured event was not the first event in the stream")]
     SessionConfiguredNotFirstEvent,

codex-rs/core/src/event_mapping.rs

@@ -25,56 +25,31 @@ pub(crate) fn map_response_item_to_event_messages(
                 return Vec::new();
             }
 
-            let mut events: Vec<EventMsg> = Vec::new();
-            let mut message_parts: Vec<String> = Vec::new();
-            let mut images: Vec<String> = Vec::new();
-            let mut kind: Option<InputMessageKind> = None;
-
-            for content_item in content.iter() {
-                match content_item {
-                    ContentItem::InputText { text } => {
-                        if kind.is_none() {
-                            let trimmed = text.trim_start();
-                            kind = if trimmed.starts_with("<environment_context>") {
-                                Some(InputMessageKind::EnvironmentContext)
-                            } else if trimmed.starts_with("<user_instructions>") {
-                                Some(InputMessageKind::UserInstructions)
-                            } else {
-                                Some(InputMessageKind::Plain)
-                            };
-                        }
-                        message_parts.push(text.clone());
-                    }
-                    ContentItem::InputImage { image_url } => {
-                        images.push(image_url.clone());
-                    }
+            let events: Vec<EventMsg> = content
+                .iter()
+                .filter_map(|content_item| match content_item {
                     ContentItem::OutputText { text } => {
-                        events.push(EventMsg::AgentMessage(AgentMessageEvent {
+                        Some(EventMsg::AgentMessage(AgentMessageEvent {
                             message: text.clone(),
-                        }));
+                        }))
                     }
-                }
-            }
-
-            if !message_parts.is_empty() || !images.is_empty() {
-                let message = if message_parts.is_empty() {
-                    String::new()
-                } else {
-                    message_parts.join("")
-                };
-                let images = if images.is_empty() {
-                    None
-                } else {
-                    Some(images)
-                };
-
-                events.push(EventMsg::UserMessage(UserMessageEvent {
-                    message,
-                    kind,
-                    images,
-                }));
-            }
-
+                    ContentItem::InputText { text } => {
+                        let trimmed = text.trim_start();
+                        let kind = if trimmed.starts_with("<environment_context>") {
+                            Some(InputMessageKind::EnvironmentContext)
+                        } else if trimmed.starts_with("<user_instructions>") {
+                            Some(InputMessageKind::UserInstructions)
+                        } else {
+                            Some(InputMessageKind::Plain)
+                        };
+                        Some(EventMsg::UserMessage(UserMessageEvent {
+                            message: text.clone(),
+                            kind,
+                        }))
+                    }
+                    _ => None,
+                })
+                .collect();
             events
         }
 
@@ -116,52 +91,9 @@ pub(crate) fn map_response_item_to_event_messages(
         ResponseItem::FunctionCall { .. }
         | ResponseItem::FunctionCallOutput { .. }
         | ResponseItem::LocalShellCall { .. }
+        | ResponseItem::UnifiedExec { .. }
         | ResponseItem::CustomToolCall { .. }
         | ResponseItem::CustomToolCallOutput { .. }
         | ResponseItem::Other => Vec::new(),
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::map_response_item_to_event_messages;
-    use crate::protocol::EventMsg;
-    use crate::protocol::InputMessageKind;
-    use codex_protocol::models::ContentItem;
-    use codex_protocol::models::ResponseItem;
-    use pretty_assertions::assert_eq;
-
-    #[test]
-    fn maps_user_message_with_text_and_two_images() {
-        let img1 = "https://example.com/one.png".to_string();
-        let img2 = "https://example.com/two.jpg".to_string();
-
-        let item = ResponseItem::Message {
-            id: None,
-            role: "user".to_string(),
-            content: vec![
-                ContentItem::InputText {
-                    text: "Hello world".to_string(),
-                },
-                ContentItem::InputImage {
-                    image_url: img1.clone(),
-                },
-                ContentItem::InputImage {
-                    image_url: img2.clone(),
-                },
-            ],
-        };
-
-        let events = map_response_item_to_event_messages(&item, false);
-        assert_eq!(events.len(), 1, "expected a single user message event");
-
-        match &events[0] {
-            EventMsg::UserMessage(user) => {
-                assert_eq!(user.message, "Hello world");
-                assert!(matches!(user.kind, Some(InputMessageKind::Plain)));
-                assert_eq!(user.images, Some(vec![img1.clone(), img2.clone()]));
-            }
-            other => panic!("expected UserMessage, got {other:?}"),
-        }
-    }
-}

codex-rs/core/src/exec_command/session_manager.rs

@@ -3,7 +3,6 @@ use std::io::ErrorKind;
 use std::io::Read;
 use std::sync::Arc;
 use std::sync::Mutex as StdMutex;
-use std::sync::atomic::AtomicBool;
 use std::sync::atomic::AtomicU32;
 
 use portable_pty::CommandBuilder;
@@ -329,8 +328,8 @@ async fn create_exec_command_session(
 
     // Keep the child alive until it exits, then signal exit code.
     let (exit_tx, exit_rx) = oneshot::channel::<i32>();
-    let exit_status = Arc::new(AtomicBool::new(false));
-    let wait_exit_status = exit_status.clone();
+    let exit_status = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false));
+    let wait_exit_status = std::sync::Arc::clone(&exit_status);
     let wait_handle = tokio::task::spawn_blocking(move || {
         let code = match child.wait() {
             Ok(status) => status.exit_code() as i32,

codex-rs/core/src/git_info.rs

@@ -3,7 +3,6 @@ use std::path::Path;
 use std::path::PathBuf;
 
 use codex_protocol::mcp_protocol::GitSha;
-use codex_protocol::protocol::GitInfo;
 use futures::future::join_all;
 use serde::Deserialize;
 use serde::Serialize;
@@ -44,6 +43,19 @@ pub fn get_git_repo_root(base_dir: &Path) -> Option<PathBuf> {
 /// Timeout for git commands to prevent freezing on large repositories
 const GIT_COMMAND_TIMEOUT: TokioDuration = TokioDuration::from_secs(5);
 
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct GitInfo {
+    /// Current commit hash (SHA)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub commit_hash: Option<String>,
+    /// Current branch name
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub branch: Option<String>,
+    /// Repository URL (if available from remote)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub repository_url: Option<String>,
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug)]
 pub struct GitDiffToRemote {
     pub sha: GitSha,

codex-rs/core/src/lib.rs

@@ -16,7 +16,6 @@ mod codex_conversation;
 pub mod token_data;
 pub use codex_conversation::CodexConversation;
 pub mod config;
-pub mod config_edit;
 pub mod config_profile;
 pub mod config_types;
 mod conversation_history;
@@ -45,7 +44,6 @@ pub use model_provider_info::built_in_model_providers;
 pub use model_provider_info::create_oss_provider_with_base_url;
 mod conversation_manager;
 mod event_mapping;
-pub use codex_protocol::protocol::InitialHistory;
 pub use conversation_manager::ConversationManager;
 pub use conversation_manager::NewConversation;
 // Re-export common auth types for workspace consumers
@@ -65,10 +63,7 @@ pub mod spawn;
 pub mod terminal;
 mod tool_apply_patch;
 pub mod turn_diff_tracker;
-pub use rollout::ARCHIVED_SESSIONS_SUBDIR;
 pub use rollout::RolloutRecorder;
-pub use rollout::SESSIONS_SUBDIR;
-pub use rollout::SessionMeta;
 pub use rollout::list::ConversationItem;
 pub use rollout::list::ConversationsPage;
 pub use rollout::list::Cursor;

codex-rs/core/src/mcp_connection_manager.rs

@@ -9,7 +9,6 @@
 use std::collections::HashMap;
 use std::collections::HashSet;
 use std::ffi::OsString;
-use std::sync::Arc;
 use std::time::Duration;
 
 use anyhow::Context;
@@ -37,8 +36,8 @@ use crate::config_types::McpServerConfig;
 const MCP_TOOL_NAME_DELIMITER: &str = "__";
 const MAX_TOOL_NAME_LENGTH: usize = 64;
 
-/// Default timeout for initializing MCP server & initially listing tools.
-const DEFAULT_STARTUP_TIMEOUT: Duration = Duration::from_secs(10);
+/// Timeout for the `tools/list` request.
+const LIST_TOOLS_TIMEOUT: Duration = Duration::from_secs(10);
 
 /// Map that holds a startup error for every MCP server that could **not** be
 /// spawned successfully.
@@ -82,11 +81,6 @@ struct ToolInfo {
     tool: Tool,
 }
 
-struct ManagedClient {
-    client: Arc<McpClient>,
-    startup_timeout: Duration,
-}
-
 /// A thin wrapper around a set of running [`McpClient`] instances.
 #[derive(Default)]
 pub(crate) struct McpConnectionManager {
@@ -94,7 +88,7 @@ pub(crate) struct McpConnectionManager {
     ///
     /// The server name originates from the keys of the `mcp_servers` map in
     /// the user configuration.
-    clients: HashMap<String, ManagedClient>,
+    clients: HashMap<String, std::sync::Arc<McpClient>>,
 
     /// Fully qualified tool name -> tool instance.
     tools: HashMap<String, ToolInfo>,
@@ -132,15 +126,8 @@ impl McpConnectionManager {
                 continue;
             }
 
-            let startup_timeout = cfg
-                .startup_timeout_ms
-                .map(Duration::from_millis)
-                .unwrap_or(DEFAULT_STARTUP_TIMEOUT);
-
             join_set.spawn(async move {
-                let McpServerConfig {
-                    command, args, env, ..
-                } = cfg;
+                let McpServerConfig { command, args, env } = cfg;
                 let client_res = McpClient::new_stdio_client(
                     command.into(),
                     args.into_iter().map(OsString::from).collect(),
@@ -163,23 +150,16 @@ impl McpConnectionManager {
                                 name: "codex-mcp-client".to_owned(),
                                 version: env!("CARGO_PKG_VERSION").to_owned(),
                                 title: Some("Codex".into()),
-                                // This field is used by Codex when it is an MCP
-                                // server: it should not be used when Codex is
-                                // an MCP client.
-                                user_agent: None,
                             },
                             protocol_version: mcp_types::MCP_SCHEMA_VERSION.to_owned(),
                         };
                         let initialize_notification_params = None;
+                        let timeout = Some(Duration::from_secs(10));
                         match client
-                            .initialize(
-                                params,
-                                initialize_notification_params,
-                                Some(startup_timeout),
-                            )
+                            .initialize(params, initialize_notification_params, timeout)
                             .await
                         {
-                            Ok(_response) => (server_name, Ok((client, startup_timeout))),
+                            Ok(_response) => (server_name, Ok(client)),
                             Err(e) => (server_name, Err(e)),
                         }
                     }
@@ -188,26 +168,15 @@ impl McpConnectionManager {
             });
         }
 
-        let mut clients: HashMap<String, ManagedClient> = HashMap::with_capacity(join_set.len());
+        let mut clients: HashMap<String, std::sync::Arc<McpClient>> =
+            HashMap::with_capacity(join_set.len());
 
         while let Some(res) = join_set.join_next().await {
-            let (server_name, client_res) = match res {
-                Ok((server_name, client_res)) => (server_name, client_res),
-                Err(e) => {
-                    warn!("Task panic when starting MCP server: {e:#}");
-                    continue;
-                }
-            };
+            let (server_name, client_res) = res?; // JoinError propagation
 
             match client_res {
-                Ok((client, startup_timeout)) => {
-                    clients.insert(
-                        server_name,
-                        ManagedClient {
-                            client: Arc::new(client),
-                            startup_timeout,
-                        },
-                    );
+                Ok(client) => {
+                    clients.insert(server_name, std::sync::Arc::new(client));
                 }
                 Err(e) => {
                     errors.insert(server_name, e);
@@ -215,13 +184,7 @@ impl McpConnectionManager {
             }
         }
 
-        let all_tools = match list_all_tools(&clients).await {
-            Ok(tools) => tools,
-            Err(e) => {
-                warn!("Failed to list tools from some MCP servers: {e:#}");
-                Vec::new()
-            }
-        };
+        let all_tools = list_all_tools(&clients).await?;
 
         let tools = qualify_tools(all_tools);
 
@@ -249,7 +212,6 @@ impl McpConnectionManager {
             .clients
             .get(server)
             .ok_or_else(|| anyhow!("unknown MCP server '{server}'"))?
-            .client
             .clone();
 
         client
@@ -267,18 +229,21 @@ impl McpConnectionManager {
 
 /// Query every server for its available tools and return a single map that
 /// contains **all** tools. Each key is the fully-qualified name for the tool.
-async fn list_all_tools(clients: &HashMap<String, ManagedClient>) -> Result<Vec<ToolInfo>> {
+async fn list_all_tools(
+    clients: &HashMap<String, std::sync::Arc<McpClient>>,
+) -> Result<Vec<ToolInfo>> {
     let mut join_set = JoinSet::new();
 
     // Spawn one task per server so we can query them concurrently. This
     // keeps the overall latency roughly at the slowest server instead of
     // the cumulative latency.
-    for (server_name, managed_client) in clients {
+    for (server_name, client) in clients {
         let server_name_cloned = server_name.clone();
-        let client_clone = managed_client.client.clone();
-        let startup_timeout = managed_client.startup_timeout;
+        let client_clone = client.clone();
         join_set.spawn(async move {
-            let res = client_clone.list_tools(None, Some(startup_timeout)).await;
+            let res = client_clone
+                .list_tools(None, Some(LIST_TOOLS_TIMEOUT))
+                .await;
             (server_name_cloned, res)
         });
     }
@@ -286,19 +251,8 @@ async fn list_all_tools(clients: &HashMap<String, ManagedClient>) -> Result<Vec<
     let mut aggregated: Vec<ToolInfo> = Vec::with_capacity(join_set.len());
 
     while let Some(join_res) = join_set.join_next().await {
-        let (server_name, list_result) = if let Ok(result) = join_res {
-            result
-        } else {
-            warn!("Task panic when listing tools for MCP server: {join_res:#?}");
-            continue;
-        };
-
-        let list_result = if let Ok(result) = list_result {
-            result
-        } else {
-            warn!("Failed to list tools for MCP server '{server_name}': {list_result:#?}");
-            continue;
-        };
+        let (server_name, list_result) = join_res?;
+        let list_result = list_result?;
 
         for tool in list_result.tools {
             let tool_info = ToolInfo {

codex-rs/core/src/message_history.rs

@@ -5,7 +5,7 @@
 //! JSON-Lines tooling. Each record has the following schema:
 //!
 //! ````text
-//! {"conversation_id":"<uuid>","ts":<unix_seconds>,"text":"<message>"}
+//! {"session_id":"<uuid>","ts":<unix_seconds>,"text":"<message>"}
 //! ````
 //!
 //! To minimise the chance of interleaved writes when multiple processes are
@@ -22,15 +22,14 @@ use std::path::PathBuf;
 
 use serde::Deserialize;
 use serde::Serialize;
-
 use std::time::Duration;
 use tokio::fs;
 use tokio::io::AsyncReadExt;
+use uuid::Uuid;
 
 use crate::config::Config;
 use crate::config_types::HistoryPersistence;
 
-use codex_protocol::mcp_protocol::ConversationId;
 #[cfg(unix)]
 use std::os::unix::fs::OpenOptionsExt;
 #[cfg(unix)]
@@ -55,14 +54,10 @@ fn history_filepath(config: &Config) -> PathBuf {
     path
 }
 
-/// Append a `text` entry associated with `conversation_id` to the history file. Uses
+/// Append a `text` entry associated with `session_id` to the history file. Uses
 /// advisory file locking to ensure that concurrent writes do not interleave,
 /// which entails a small amount of blocking I/O internally.
-pub(crate) async fn append_entry(
-    text: &str,
-    conversation_id: &ConversationId,
-    config: &Config,
-) -> Result<()> {
+pub(crate) async fn append_entry(text: &str, session_id: &Uuid, config: &Config) -> Result<()> {
     match config.history.persistence {
         HistoryPersistence::SaveAll => {
             // Save everything: proceed.
@@ -89,7 +84,7 @@ pub(crate) async fn append_entry(
 
     // Construct the JSON line first so we can write it in a single syscall.
     let entry = HistoryEntry {
-        session_id: conversation_id.to_string(),
+        session_id: session_id.to_string(),
         ts,
         text: text.to_string(),
     };

codex-rs/core/src/model_family.rs

@@ -103,7 +103,7 @@ pub fn find_family_for_model(slug: &str) -> Option<ModelFamily> {
             slug, "gpt-4.1",
             needs_special_apply_patch_instructions: true,
         )
-    } else if slug.starts_with("gpt-oss") || slug.starts_with("openai/gpt-oss") {
+    } else if slug.starts_with("gpt-oss") {
         model_family!(slug, "gpt-oss", apply_patch_tool_type: Some(ApplyPatchToolType::Function))
     } else if slug.starts_with("gpt-4o") {
         simple_model_family!(slug, "gpt-4o")

codex-rs/core/src/openai_tools.rs

@@ -8,6 +8,7 @@ use std::collections::HashMap;
 use crate::model_family::ModelFamily;
 use crate::plan_tool::PLAN_TOOL;
 use crate::protocol::AskForApproval;
+use crate::protocol::SandboxPolicy;
 use crate::tool_apply_patch::ApplyPatchToolType;
 use crate::tool_apply_patch::create_apply_patch_freeform_tool;
 use crate::tool_apply_patch::create_apply_patch_json_tool;
@@ -57,7 +58,7 @@ pub(crate) enum OpenAiTool {
 #[derive(Debug, Clone)]
 pub enum ConfigShellToolType {
     DefaultShell,
-    ShellWithRequest,
+    ShellWithRequest { sandbox_policy: SandboxPolicy },
     LocalShell,
     StreamableShell,
 }
@@ -69,18 +70,17 @@ pub(crate) struct ToolsConfig {
     pub apply_patch_tool_type: Option<ApplyPatchToolType>,
     pub web_search_request: bool,
     pub include_view_image_tool: bool,
-    pub experimental_unified_exec_tool: bool,
 }
 
 pub(crate) struct ToolsConfigParams<'a> {
     pub(crate) model_family: &'a ModelFamily,
     pub(crate) approval_policy: AskForApproval,
+    pub(crate) sandbox_policy: SandboxPolicy,
     pub(crate) include_plan_tool: bool,
     pub(crate) include_apply_patch_tool: bool,
     pub(crate) include_web_search_request: bool,
     pub(crate) use_streamable_shell_tool: bool,
     pub(crate) include_view_image_tool: bool,
-    pub(crate) experimental_unified_exec_tool: bool,
 }
 
 impl ToolsConfig {
@@ -88,12 +88,12 @@ impl ToolsConfig {
         let ToolsConfigParams {
             model_family,
             approval_policy,
+            sandbox_policy,
             include_plan_tool,
             include_apply_patch_tool,
             include_web_search_request,
             use_streamable_shell_tool,
             include_view_image_tool,
-            experimental_unified_exec_tool,
         } = params;
         let mut shell_type = if *use_streamable_shell_tool {
             ConfigShellToolType::StreamableShell
@@ -103,7 +103,9 @@ impl ToolsConfig {
             ConfigShellToolType::DefaultShell
         };
         if matches!(approval_policy, AskForApproval::OnRequest) && !use_streamable_shell_tool {
-            shell_type = ConfigShellToolType::ShellWithRequest;
+            shell_type = ConfigShellToolType::ShellWithRequest {
+                sandbox_policy: sandbox_policy.clone(),
+            }
         }
 
         let apply_patch_tool_type = match model_family.apply_patch_tool_type {
@@ -124,7 +126,6 @@ impl ToolsConfig {
             apply_patch_tool_type,
             web_search_request: *include_web_search_request,
             include_view_image_tool: *include_view_image_tool,
-            experimental_unified_exec_tool: *experimental_unified_exec_tool,
         }
     }
 }
@@ -246,9 +247,7 @@ fn create_unified_exec_tool() -> OpenAiTool {
     })
 }
 
-const SHELL_TOOL_DESCRIPTION: &str = r#"Runs a shell command and returns its output"#;
-
-fn create_shell_tool_for_sandbox() -> OpenAiTool {
+fn create_shell_tool_for_sandbox(sandbox_policy: &SandboxPolicy) -> OpenAiTool {
     let mut properties = BTreeMap::new();
     properties.insert(
         "command".to_string(),
@@ -260,29 +259,82 @@ fn create_shell_tool_for_sandbox() -> OpenAiTool {
     properties.insert(
         "workdir".to_string(),
         JsonSchema::String {
-            description: Some("Working directory to execute the command in.".to_string()),
+            description: Some("The working directory to execute the command in".to_string()),
         },
     );
     properties.insert(
         "timeout_ms".to_string(),
         JsonSchema::Number {
-            description: Some("Timeout for the command in milliseconds.".to_string()),
-        },
-    );
-    properties.insert(
-        "with_escalated_permissions".to_string(),
-        JsonSchema::Boolean {
-            description: Some("Request escalated permissions, only for when a command would otherwise be blocked by the sandbox.".to_string()),
-        },
-    );
-    properties.insert(
-        "justification".to_string(),
-        JsonSchema::String {
-            description: Some("Required if and only if with_escalated_permissions == true. One sentence explaining why escalation is needed (e.g., write outside CWD, network fetch, git commit).".to_string()),
+            description: Some("The timeout for the command in milliseconds".to_string()),
         },
     );
 
-    let description = SHELL_TOOL_DESCRIPTION.to_string();
+    if matches!(sandbox_policy, SandboxPolicy::WorkspaceWrite { .. }) {
+        properties.insert(
+        "with_escalated_permissions".to_string(),
+        JsonSchema::Boolean {
+            description: Some("Whether to request escalated permissions. Set to true if command needs to be run without sandbox restrictions".to_string()),
+        },
+    );
+        properties.insert(
+        "justification".to_string(),
+        JsonSchema::String {
+            description: Some("Only set if with_escalated_permissions is true. 1-sentence explanation of why we want to run this command.".to_string()),
+        },
+    );
+    }
+
+    let description = match sandbox_policy {
+        SandboxPolicy::WorkspaceWrite {
+            network_access,
+            writable_roots,
+            ..
+        } => {
+            format!(
+                r#"
+The shell tool is used to execute shell commands.
+- When invoking the shell tool, your call will be running in a sandbox, and some shell commands will require escalated privileges:
+  - Types of actions that require escalated privileges:
+    - Writing files other than those in the writable roots
+      - writable roots:
+{}{}
+  - Examples of commands that require escalated privileges:
+    - git commit
+    - npm install or pnpm install
+    - cargo build
+    - cargo test
+- When invoking a command that will require escalated privileges:
+  - Provide the with_escalated_permissions parameter with the boolean value true
+  - Include a short, 1 sentence explanation for why we need to run with_escalated_permissions in the justification parameter."#,
+                writable_roots.iter().map(|wr| format!("        - {}", wr.to_string_lossy())).collect::<Vec<String>>().join("\n"),
+                if !network_access {
+                    "\n    - Commands that require network access\n"
+                } else {
+                    ""
+                }
+            )
+        }
+        SandboxPolicy::DangerFullAccess => {
+            "Runs a shell command and returns its output.".to_string()
+        }
+        SandboxPolicy::ReadOnly => {
+            r#"
+The shell tool is used to execute shell commands.
+- When invoking the shell tool, your call will be running in a sandbox, and some shell commands (including apply_patch) will require escalated permissions:
+  - Types of actions that require escalated privileges:
+    - Writing files
+    - Applying patches
+  - Examples of commands that require escalated privileges:
+    - apply_patch
+    - git commit
+    - npm install or pnpm install
+    - cargo build
+    - cargo test
+- When invoking a command that will require escalated privileges:
+  - Provide the with_escalated_permissions parameter with the boolean value true
+  - Include a short, 1 sentence explanation for why we need to run with_escalated_permissions in the justification parameter"#.to_string()
+        }
+    };
 
     OpenAiTool::Function(ResponsesApiTool {
         name: "shell".to_string(),
@@ -295,6 +347,7 @@ fn create_shell_tool_for_sandbox() -> OpenAiTool {
         },
     })
 }
+
 fn create_view_image_tool() -> OpenAiTool {
     // Support only local filesystem path.
     let mut properties = BTreeMap::new();
@@ -528,29 +581,27 @@ pub(crate) fn get_openai_tools(
 ) -> Vec<OpenAiTool> {
     let mut tools: Vec<OpenAiTool> = Vec::new();
 
-    if config.experimental_unified_exec_tool {
-        tools.push(create_unified_exec_tool());
-    } else {
-        match &config.shell_type {
-            ConfigShellToolType::DefaultShell => {
-                tools.push(create_shell_tool());
-            }
-            ConfigShellToolType::ShellWithRequest => {
-                tools.push(create_shell_tool_for_sandbox());
-            }
-            ConfigShellToolType::LocalShell => {
-                tools.push(OpenAiTool::LocalShell {});
-            }
-            ConfigShellToolType::StreamableShell => {
-                tools.push(OpenAiTool::Function(
-                    crate::exec_command::create_exec_command_tool_for_responses_api(),
-                ));
-                tools.push(OpenAiTool::Function(
-                    crate::exec_command::create_write_stdin_tool_for_responses_api(),
-                ));
-            }
-        }
-    }
+    // match &config.shell_type {
+    //     ConfigShellToolType::DefaultShell => {
+    //         tools.push(create_shell_tool());
+    //     }
+    //     ConfigShellToolType::ShellWithRequest { sandbox_policy } => {
+    //         tools.push(create_shell_tool_for_sandbox(sandbox_policy));
+    //     }
+    //     ConfigShellToolType::LocalShell => {
+    //         tools.push(OpenAiTool::LocalShell {});
+    //     }
+    //     ConfigShellToolType::StreamableShell => {
+    //         tools.push(OpenAiTool::Function(
+    //             crate::exec_command::create_exec_command_tool_for_responses_api(),
+    //         ));
+    //         tools.push(OpenAiTool::Function(
+    //             crate::exec_command::create_write_stdin_tool_for_responses_api(),
+    //         ));
+    //     }
+    // }
+
+    tools.push(create_unified_exec_tool());
 
     if config.plan_tool {
         tools.push(PLAN_TOOL.clone());
@@ -576,7 +627,6 @@ pub(crate) fn get_openai_tools(
         tools.push(create_view_image_tool());
     }
     if let Some(mcp_tools) = mcp_tools {
-        // Ensure deterministic ordering to maximize prompt cache hits.
         let mut entries: Vec<(String, mcp_types::Tool)> = mcp_tools.into_iter().collect();
         entries.sort_by(|a, b| a.0.cmp(&b.0));
 
@@ -632,18 +682,24 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: true,
             include_apply_patch_tool: false,
             include_web_search_request: true,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
         let tools = get_openai_tools(&config, Some(HashMap::new()));
 
         assert_eq_tool_names(
             &tools,
-            &["unified_exec", "update_plan", "web_search", "view_image"],
+            &[
+                "local_shell",
+                "unified_exec",
+                "update_plan",
+                "web_search",
+                "view_image",
+            ],
         );
     }
 
@@ -653,18 +709,24 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: true,
             include_apply_patch_tool: false,
             include_web_search_request: true,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
         let tools = get_openai_tools(&config, Some(HashMap::new()));
 
         assert_eq_tool_names(
             &tools,
-            &["unified_exec", "update_plan", "web_search", "view_image"],
+            &[
+                "shell",
+                "unified_exec",
+                "update_plan",
+                "web_search",
+                "view_image",
+            ],
         );
     }
 
@@ -674,12 +736,12 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: false,
             include_apply_patch_tool: false,
             include_web_search_request: true,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
         let tools = get_openai_tools(
             &config,
@@ -722,6 +784,7 @@ mod tests {
         assert_eq_tool_names(
             &tools,
             &[
+                "shell",
                 "unified_exec",
                 "web_search",
                 "view_image",
@@ -730,7 +793,7 @@ mod tests {
         );
 
         assert_eq!(
-            tools[3],
+            tools[4],
             OpenAiTool::Function(ResponsesApiTool {
                 name: "test_server/do_something_cool".to_string(),
                 parameters: JsonSchema::Object {
@@ -779,12 +842,12 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: false,
             include_apply_patch_tool: false,
             include_web_search_request: false,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
 
         // Intentionally construct a map with keys that would sort alphabetically.
@@ -837,10 +900,11 @@ mod tests {
         ]);
 
         let tools = get_openai_tools(&config, Some(tools_map));
-        // Expect unified_exec first, followed by MCP tools sorted by fully-qualified name.
+        // Expect shell first, followed by MCP tools sorted by fully-qualified name.
         assert_eq_tool_names(
             &tools,
             &[
+                "shell",
                 "unified_exec",
                 "view_image",
                 "test_server/cool",
@@ -856,12 +920,12 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: false,
             include_apply_patch_tool: false,
             include_web_search_request: true,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
 
         let tools = get_openai_tools(
@@ -889,11 +953,17 @@ mod tests {
 
         assert_eq_tool_names(
             &tools,
-            &["unified_exec", "web_search", "view_image", "dash/search"],
+            &[
+                "shell",
+                "unified_exec",
+                "web_search",
+                "view_image",
+                "dash/search",
+            ],
         );
 
         assert_eq!(
-            tools[3],
+            tools[4],
             OpenAiTool::Function(ResponsesApiTool {
                 name: "dash/search".to_string(),
                 parameters: JsonSchema::Object {
@@ -918,12 +988,12 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: false,
             include_apply_patch_tool: false,
             include_web_search_request: true,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
 
         let tools = get_openai_tools(
@@ -949,10 +1019,16 @@ mod tests {
 
         assert_eq_tool_names(
             &tools,
-            &["unified_exec", "web_search", "view_image", "dash/paginate"],
+            &[
+                "shell",
+                "unified_exec",
+                "web_search",
+                "view_image",
+                "dash/paginate",
+            ],
         );
         assert_eq!(
-            tools[3],
+            tools[4],
             OpenAiTool::Function(ResponsesApiTool {
                 name: "dash/paginate".to_string(),
                 parameters: JsonSchema::Object {
@@ -975,12 +1051,12 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: false,
             include_apply_patch_tool: false,
             include_web_search_request: true,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
 
         let tools = get_openai_tools(
@@ -1006,10 +1082,16 @@ mod tests {
 
         assert_eq_tool_names(
             &tools,
-            &["unified_exec", "web_search", "view_image", "dash/tags"],
+            &[
+                "shell",
+                "unified_exec",
+                "web_search",
+                "view_image",
+                "dash/tags",
+            ],
         );
         assert_eq!(
-            tools[3],
+            tools[4],
             OpenAiTool::Function(ResponsesApiTool {
                 name: "dash/tags".to_string(),
                 parameters: JsonSchema::Object {
@@ -1035,12 +1117,12 @@ mod tests {
         let config = ToolsConfig::new(&ToolsConfigParams {
             model_family: &model_family,
             approval_policy: AskForApproval::Never,
+            sandbox_policy: SandboxPolicy::ReadOnly,
             include_plan_tool: false,
             include_apply_patch_tool: false,
             include_web_search_request: true,
             use_streamable_shell_tool: false,
             include_view_image_tool: true,
-            experimental_unified_exec_tool: true,
         });
 
         let tools = get_openai_tools(
@@ -1066,10 +1148,16 @@ mod tests {
 
         assert_eq_tool_names(
             &tools,
-            &["unified_exec", "web_search", "view_image", "dash/value"],
+            &[
+                "shell",
+                "unified_exec",
+                "web_search",
+                "view_image",
+                "dash/value",
+            ],
         );
         assert_eq!(
-            tools[3],
+            tools[4],
             OpenAiTool::Function(ResponsesApiTool {
                 name: "dash/value".to_string(),
                 parameters: JsonSchema::Object {
@@ -1088,7 +1176,13 @@ mod tests {
 
     #[test]
     fn test_shell_tool_for_sandbox_workspace_write() {
-        let tool = super::create_shell_tool_for_sandbox();
+        let sandbox_policy = SandboxPolicy::WorkspaceWrite {
+            writable_roots: vec!["workspace".into()],
+            network_access: false,
+            exclude_tmpdir_env_var: false,
+            exclude_slash_tmp: false,
+        };
+        let tool = super::create_shell_tool_for_sandbox(&sandbox_policy);
         let OpenAiTool::Function(ResponsesApiTool {
             description, name, ..
         }) = &tool
@@ -1097,13 +1191,29 @@ mod tests {
         };
         assert_eq!(name, "shell");
 
-        let expected = super::SHELL_TOOL_DESCRIPTION;
+        let expected = r#"
+The shell tool is used to execute shell commands.
+- When invoking the shell tool, your call will be running in a sandbox, and some shell commands will require escalated privileges:
+  - Types of actions that require escalated privileges:
+    - Writing files other than those in the writable roots
+      - writable roots:
+        - workspace
+    - Commands that require network access
+
+  - Examples of commands that require escalated privileges:
+    - git commit
+    - npm install or pnpm install
+    - cargo build
+    - cargo test
+- When invoking a command that will require escalated privileges:
+  - Provide the with_escalated_permissions parameter with the boolean value true
+  - Include a short, 1 sentence explanation for why we need to run with_escalated_permissions in the justification parameter."#;
         assert_eq!(description, expected);
     }
 
     #[test]
     fn test_shell_tool_for_sandbox_readonly() {
-        let tool = super::create_shell_tool_for_sandbox();
+        let tool = super::create_shell_tool_for_sandbox(&SandboxPolicy::ReadOnly);
         let OpenAiTool::Function(ResponsesApiTool {
             description, name, ..
         }) = &tool
@@ -1112,13 +1222,27 @@ mod tests {
         };
         assert_eq!(name, "shell");
 
-        let expected = super::SHELL_TOOL_DESCRIPTION;
+        let expected = r#"
+The shell tool is used to execute shell commands.
+- When invoking the shell tool, your call will be running in a sandbox, and some shell commands (including apply_patch) will require escalated permissions:
+  - Types of actions that require escalated privileges:
+    - Writing files
+    - Applying patches
+  - Examples of commands that require escalated privileges:
+    - apply_patch
+    - git commit
+    - npm install or pnpm install
+    - cargo build
+    - cargo test
+- When invoking a command that will require escalated privileges:
+  - Provide the with_escalated_permissions parameter with the boolean value true
+  - Include a short, 1 sentence explanation for why we need to run with_escalated_permissions in the justification parameter"#;
         assert_eq!(description, expected);
     }
 
     #[test]
     fn test_shell_tool_for_sandbox_danger_full_access() {
-        let tool = super::create_shell_tool_for_sandbox();
+        let tool = super::create_shell_tool_for_sandbox(&SandboxPolicy::DangerFullAccess);
         let OpenAiTool::Function(ResponsesApiTool {
             description, name, ..
         }) = &tool
@@ -1127,7 +1251,6 @@ mod tests {
         };
         assert_eq!(name, "shell");
 
-        let expected = super::SHELL_TOOL_DESCRIPTION;
-        assert_eq!(description, expected);
+        assert_eq!(description, "Runs a shell command and returns its output.");
     }
 }

codex-rs/core/src/rollout/list.rs

@@ -10,9 +10,6 @@ use time::macros::format_description;
 use uuid::Uuid;
 
 use super::SESSIONS_SUBDIR;
-use crate::protocol::EventMsg;
-use codex_protocol::protocol::RolloutItem;
-use codex_protocol::protocol::RolloutLine;
 
 /// Returned page of conversation summaries.
 #[derive(Debug, Default, PartialEq)]
@@ -37,7 +34,7 @@ pub struct ConversationItem {
 }
 
 /// Hard cap to bound worst‑case work per request.
-const MAX_SCAN_FILES: usize = 100;
+const MAX_SCAN_FILES: usize = 10_000;
 const HEAD_RECORD_LIMIT: usize = 10;
 
 /// Pagination cursor identifying a file by timestamp and UUID.
@@ -170,16 +167,10 @@ async fn traverse_directories_for_paths(
                     if items.len() == page_size {
                         break 'outer;
                     }
-                    // Read head and simultaneously detect message events within the same
-                    // first N JSONL records to avoid a second file read.
-                    let (head, saw_session_meta, saw_user_event) =
-                        read_head_and_flags(&path, HEAD_RECORD_LIMIT)
-                            .await
-                            .unwrap_or((Vec::new(), false, false));
-                    // Apply filters: must have session meta and at least one user message event
-                    if saw_session_meta && saw_user_event {
-                        items.push(ConversationItem { path, head });
-                    }
+                    let head = read_first_jsonl_records(&path, HEAD_RECORD_LIMIT)
+                        .await
+                        .unwrap_or_default();
+                    items.push(ConversationItem { path, head });
                 }
             }
         }
@@ -282,19 +273,16 @@ fn parse_timestamp_uuid_from_filename(name: &str) -> Option<(OffsetDateTime, Uui
     Some((ts, uuid))
 }
 
-async fn read_head_and_flags(
+async fn read_first_jsonl_records(
     path: &Path,
     max_records: usize,
-) -> io::Result<(Vec<serde_json::Value>, bool, bool)> {
+) -> io::Result<Vec<serde_json::Value>> {
     use tokio::io::AsyncBufReadExt;
 
     let file = tokio::fs::File::open(path).await?;
     let reader = tokio::io::BufReader::new(file);
     let mut lines = reader.lines();
     let mut head: Vec<serde_json::Value> = Vec::new();
-    let mut saw_session_meta = false;
-    let mut saw_user_event = false;
-
     while head.len() < max_records {
         let line_opt = lines.next_line().await?;
         let Some(line) = line_opt else { break };
@@ -302,29 +290,9 @@ async fn read_head_and_flags(
         if trimmed.is_empty() {
             continue;
         }
-
-        let parsed: Result<RolloutLine, _> = serde_json::from_str(trimmed);
-        let Ok(rollout_line) = parsed else { continue };
-
-        match rollout_line.item {
-            RolloutItem::SessionMeta(session_meta_line) => {
-                if let Ok(val) = serde_json::to_value(session_meta_line) {
-                    head.push(val);
-                    saw_session_meta = true;
-                }
-            }
-            RolloutItem::ResponseItem(item) => {
-                if let Ok(val) = serde_json::to_value(item) {
-                    head.push(val);
-                }
-            }
-            RolloutItem::EventMsg(ev) => {
-                if matches!(ev, EventMsg::UserMessage(_)) {
-                    saw_user_event = true;
-                }
-            }
+        if let Ok(v) = serde_json::from_str::<serde_json::Value>(trimmed) {
+            head.push(v);
         }
     }
-
-    Ok((head, saw_session_meta, saw_user_event))
+    Ok(head)
 }

codex-rs/core/src/rollout/mod.rs

@@ -1,15 +1,13 @@
 //! Rollout module: persistence and discovery of session rollout files.
 
-pub const SESSIONS_SUBDIR: &str = "sessions";
-pub const ARCHIVED_SESSIONS_SUBDIR: &str = "archived_sessions";
+pub(crate) const SESSIONS_SUBDIR: &str = "sessions";
 
 pub mod list;
 pub(crate) mod policy;
 pub mod recorder;
 
-pub use codex_protocol::protocol::SessionMeta;
 pub use recorder::RolloutRecorder;
-pub use recorder::RolloutRecorderParams;
+pub use recorder::SessionStateSnapshot;
 
 #[cfg(test)]
 pub mod tests;

codex-rs/core/src/rollout/policy.rs

@@ -1,25 +1,13 @@
-use crate::protocol::EventMsg;
-use crate::protocol::RolloutItem;
 use codex_protocol::models::ResponseItem;
 
-/// Whether a rollout `item` should be persisted in rollout files.
-#[inline]
-pub(crate) fn is_persisted_response_item(item: &RolloutItem) -> bool {
-    match item {
-        RolloutItem::ResponseItem(item) => should_persist_response_item(item),
-        RolloutItem::EventMsg(ev) => should_persist_event_msg(ev),
-        // Always persist session meta
-        RolloutItem::SessionMeta(_) => true,
-    }
-}
-
 /// Whether a `ResponseItem` should be persisted in rollout files.
 #[inline]
-pub(crate) fn should_persist_response_item(item: &ResponseItem) -> bool {
+pub(crate) fn is_persisted_response_item(item: &ResponseItem) -> bool {
     match item {
         ResponseItem::Message { .. }
         | ResponseItem::Reasoning { .. }
         | ResponseItem::LocalShellCall { .. }
+        | ResponseItem::UnifiedExec { .. }
         | ResponseItem::FunctionCall { .. }
         | ResponseItem::FunctionCallOutput { .. }
         | ResponseItem::CustomToolCall { .. }
@@ -27,44 +15,3 @@ pub(crate) fn should_persist_response_item(item: &ResponseItem) -> bool {
         ResponseItem::WebSearchCall { .. } | ResponseItem::Other => false,
     }
 }
-
-/// Whether an `EventMsg` should be persisted in rollout files.
-#[inline]
-pub(crate) fn should_persist_event_msg(ev: &EventMsg) -> bool {
-    match ev {
-        EventMsg::UserMessage(_)
-        | EventMsg::AgentMessage(_)
-        | EventMsg::AgentReasoning(_)
-        | EventMsg::AgentReasoningRawContent(_)
-        | EventMsg::TokenCount(_) => true,
-        EventMsg::Error(_)
-        | EventMsg::TaskStarted(_)
-        | EventMsg::TaskComplete(_)
-        | EventMsg::AgentMessageDelta(_)
-        | EventMsg::AgentReasoningDelta(_)
-        | EventMsg::AgentReasoningRawContentDelta(_)
-        | EventMsg::AgentReasoningSectionBreak(_)
-        | EventMsg::SessionConfigured(_)
-        | EventMsg::McpToolCallBegin(_)
-        | EventMsg::McpToolCallEnd(_)
-        | EventMsg::WebSearchBegin(_)
-        | EventMsg::WebSearchEnd(_)
-        | EventMsg::ExecCommandBegin(_)
-        | EventMsg::ExecCommandOutputDelta(_)
-        | EventMsg::ExecCommandEnd(_)
-        | EventMsg::ExecApprovalRequest(_)
-        | EventMsg::ApplyPatchApprovalRequest(_)
-        | EventMsg::BackgroundEvent(_)
-        | EventMsg::StreamError(_)
-        | EventMsg::PatchApplyBegin(_)
-        | EventMsg::PatchApplyEnd(_)
-        | EventMsg::TurnDiff(_)
-        | EventMsg::GetHistoryEntryResponse(_)
-        | EventMsg::McpListToolsResponse(_)
-        | EventMsg::ListCustomPromptsResponse(_)
-        | EventMsg::PlanUpdate(_)
-        | EventMsg::TurnAborted(_)
-        | EventMsg::ShutdownComplete
-        | EventMsg::ConversationPath(_) => false,
-    }
-}

codex-rs/core/src/rollout/recorder.rs

@@ -4,9 +4,7 @@ use std::fs::File;
 use std::fs::{self};
 use std::io::Error as IoError;
 use std::path::Path;
-use std::path::PathBuf;
 
-use codex_protocol::mcp_protocol::ConversationId;
 use serde::Deserialize;
 use serde::Serialize;
 use serde_json::Value;
@@ -19,6 +17,7 @@ use tokio::sync::mpsc::{self};
 use tokio::sync::oneshot;
 use tracing::info;
 use tracing::warn;
+use uuid::Uuid;
 
 use super::SESSIONS_SUBDIR;
 use super::list::ConversationsPage;
@@ -26,15 +25,25 @@ use super::list::Cursor;
 use super::list::get_conversations;
 use super::policy::is_persisted_response_item;
 use crate::config::Config;
-use crate::default_client::ORIGINATOR;
+use crate::conversation_manager::InitialHistory;
+use crate::git_info::GitInfo;
 use crate::git_info::collect_git_info;
 use codex_protocol::models::ResponseItem;
-use codex_protocol::protocol::InitialHistory;
-use codex_protocol::protocol::ResumedHistory;
-use codex_protocol::protocol::RolloutItem;
-use codex_protocol::protocol::RolloutLine;
-use codex_protocol::protocol::SessionMeta;
-use codex_protocol::protocol::SessionMetaLine;
+
+#[derive(Serialize, Deserialize, Clone, Default)]
+pub struct SessionMeta {
+    pub id: Uuid,
+    pub timestamp: String,
+    pub instructions: Option<String>,
+}
+
+#[derive(Serialize)]
+struct SessionMetaWithGit {
+    #[serde(flatten)]
+    meta: SessionMeta,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    git: Option<GitInfo>,
+}
 
 #[derive(Serialize, Deserialize, Default, Clone)]
 pub struct SessionStateSnapshot {}
@@ -46,7 +55,7 @@ pub struct SavedSession {
     pub items: Vec<ResponseItem>,
     #[serde(default)]
     pub state: SessionStateSnapshot,
-    pub session_id: ConversationId,
+    pub session_id: Uuid,
 }
 
 /// Records all [`ResponseItem`]s for a session and flushes them to disk after
@@ -61,45 +70,16 @@ pub struct SavedSession {
 #[derive(Clone)]
 pub struct RolloutRecorder {
     tx: Sender<RolloutCmd>,
-    pub(crate) rollout_path: PathBuf,
-}
-
-#[derive(Clone)]
-pub enum RolloutRecorderParams {
-    Create {
-        conversation_id: ConversationId,
-        instructions: Option<String>,
-    },
-    Resume {
-        path: PathBuf,
-    },
 }
 
 enum RolloutCmd {
-    AddItems(Vec<RolloutItem>),
-    /// Ensure all prior writes are processed; respond when flushed.
-    Flush {
-        ack: oneshot::Sender<()>,
-    },
-    Shutdown {
-        ack: oneshot::Sender<()>,
-    },
-}
-
-impl RolloutRecorderParams {
-    pub fn new(conversation_id: ConversationId, instructions: Option<String>) -> Self {
-        Self::Create {
-            conversation_id,
-            instructions,
-        }
-    }
-
-    pub fn resume(path: PathBuf) -> Self {
-        Self::Resume { path }
-    }
+    AddItems(Vec<ResponseItem>),
+    UpdateState(SessionStateSnapshot),
+    Shutdown { ack: oneshot::Sender<()> },
 }
 
 impl RolloutRecorder {
+    #[allow(dead_code)]
     /// List conversations (rollout files) under the provided Codex home directory.
     pub async fn list_conversations(
         codex_home: &Path,
@@ -112,49 +92,24 @@ impl RolloutRecorder {
     /// Attempt to create a new [`RolloutRecorder`]. If the sessions directory
     /// cannot be created or the rollout file cannot be opened we return the
     /// error so the caller can decide whether to disable persistence.
-    pub async fn new(config: &Config, params: RolloutRecorderParams) -> std::io::Result<Self> {
-        let (file, rollout_path, meta) = match params {
-            RolloutRecorderParams::Create {
-                conversation_id,
-                instructions,
-            } => {
-                let LogFileInfo {
-                    file,
-                    path,
-                    conversation_id: session_id,
-                    timestamp,
-                } = create_log_file(config, conversation_id)?;
+    pub async fn new(
+        config: &Config,
+        uuid: Uuid,
+        instructions: Option<String>,
+    ) -> std::io::Result<Self> {
+        let LogFileInfo {
+            file,
+            session_id,
+            timestamp,
+        } = create_log_file(config, uuid)?;
 
-                let timestamp_format: &[FormatItem] = format_description!(
-                    "[year]-[month]-[day]T[hour]:[minute]:[second].[subsecond digits:3]Z"
-                );
-                let timestamp = timestamp
-                    .to_offset(time::UtcOffset::UTC)
-                    .format(timestamp_format)
-                    .map_err(|e| IoError::other(format!("failed to format timestamp: {e}")))?;
-
-                (
-                    tokio::fs::File::from_std(file),
-                    path,
-                    Some(SessionMeta {
-                        id: session_id,
-                        timestamp,
-                        cwd: config.cwd.clone(),
-                        originator: ORIGINATOR.value.clone(),
-                        cli_version: env!("CARGO_PKG_VERSION").to_string(),
-                        instructions,
-                    }),
-                )
-            }
-            RolloutRecorderParams::Resume { path } => (
-                tokio::fs::OpenOptions::new()
-                    .append(true)
-                    .open(&path)
-                    .await?,
-                path,
-                None,
-            ),
-        };
+        let timestamp_format: &[FormatItem] = format_description!(
+            "[year]-[month]-[day]T[hour]:[minute]:[second].[subsecond digits:3]Z"
+        );
+        let timestamp = timestamp
+            .to_offset(time::UtcOffset::UTC)
+            .format(timestamp_format)
+            .map_err(|e| IoError::other(format!("failed to format timestamp: {e}")))?;
 
         // Clone the cwd for the spawned task to collect git info asynchronously
         let cwd = config.cwd.clone();
@@ -167,12 +122,21 @@ impl RolloutRecorder {
         // Spawn a Tokio task that owns the file handle and performs async
         // writes. Using `tokio::fs::File` keeps everything on the async I/O
         // driver instead of blocking the runtime.
-        tokio::task::spawn(rollout_writer(file, rx, meta, cwd));
+        tokio::task::spawn(rollout_writer(
+            tokio::fs::File::from_std(file),
+            rx,
+            Some(SessionMeta {
+                timestamp,
+                id: session_id,
+                instructions,
+            }),
+            cwd,
+        ));
 
-        Ok(Self { tx, rollout_path })
+        Ok(Self { tx })
     }
 
-    pub(crate) async fn record_items(&self, items: &[RolloutItem]) -> std::io::Result<()> {
+    pub(crate) async fn record_items(&self, items: &[ResponseItem]) -> std::io::Result<()> {
         let mut filtered = Vec::new();
         for item in items {
             // Note that function calls may look a bit strange if they are
@@ -191,85 +155,55 @@ impl RolloutRecorder {
             .map_err(|e| IoError::other(format!("failed to queue rollout items: {e}")))
     }
 
-    /// Flush all queued writes and wait until they are committed by the writer task.
-    pub async fn flush(&self) -> std::io::Result<()> {
-        let (tx, rx) = oneshot::channel();
+    pub(crate) async fn record_state(&self, state: SessionStateSnapshot) -> std::io::Result<()> {
         self.tx
-            .send(RolloutCmd::Flush { ack: tx })
+            .send(RolloutCmd::UpdateState(state))
             .await
-            .map_err(|e| IoError::other(format!("failed to queue rollout flush: {e}")))?;
-        rx.await
-            .map_err(|e| IoError::other(format!("failed waiting for rollout flush: {e}")))
+            .map_err(|e| IoError::other(format!("failed to queue rollout state: {e}")))
     }
 
-    pub(crate) async fn get_rollout_history(path: &Path) -> std::io::Result<InitialHistory> {
+    pub async fn get_rollout_history(path: &Path) -> std::io::Result<InitialHistory> {
         info!("Resuming rollout from {path:?}");
-        tracing::error!("Resuming rollout from {path:?}");
         let text = tokio::fs::read_to_string(path).await?;
-        if text.trim().is_empty() {
-            return Err(IoError::other("empty session file"));
-        }
+        let mut lines = text.lines();
+        let _ = lines
+            .next()
+            .ok_or_else(|| IoError::other("empty session file"))?;
+        let mut items = Vec::new();
 
-        let mut items: Vec<RolloutItem> = Vec::new();
-        let mut conversation_id: Option<ConversationId> = None;
-        for line in text.lines() {
+        for line in lines {
             if line.trim().is_empty() {
                 continue;
             }
             let v: Value = match serde_json::from_str(line) {
                 Ok(v) => v,
-                Err(e) => {
-                    warn!("failed to parse line as JSON: {line:?}, error: {e}");
-                    continue;
-                }
+                Err(_) => continue,
             };
-
-            // Parse the rollout line structure
-            match serde_json::from_value::<RolloutLine>(v.clone()) {
-                Ok(rollout_line) => match rollout_line.item {
-                    RolloutItem::SessionMeta(session_meta_line) => {
-                        // Use the FIRST SessionMeta encountered in the file as the canonical
-                        // conversation id and main session information. Keep all items intact.
-                        if conversation_id.is_none() {
-                            conversation_id = Some(session_meta_line.meta.id);
-                        }
-                        items.push(RolloutItem::SessionMeta(session_meta_line));
+            if v.get("record_type")
+                .and_then(|rt| rt.as_str())
+                .map(|s| s == "state")
+                .unwrap_or(false)
+            {
+                continue;
+            }
+            match serde_json::from_value::<ResponseItem>(v.clone()) {
+                Ok(item) => {
+                    if is_persisted_response_item(&item) {
+                        items.push(item);
                     }
-                    RolloutItem::ResponseItem(item) => {
-                        items.push(RolloutItem::ResponseItem(item));
-                    }
-                    RolloutItem::EventMsg(_ev) => {
-                        items.push(RolloutItem::EventMsg(_ev));
-                    }
-                },
+                }
                 Err(e) => {
-                    warn!("failed to parse rollout line: {v:?}, error: {e}");
+                    warn!("failed to parse item: {v:?}, error: {e}");
                 }
             }
         }
 
-        tracing::error!(
-            "Resumed rollout with {} items, conversation ID: {:?}",
-            items.len(),
-            conversation_id
-        );
-        let conversation_id = conversation_id
-            .ok_or_else(|| IoError::other("failed to parse conversation ID from rollout file"))?;
-
-        if items.is_empty() {
-            return Ok(InitialHistory::New);
-        }
-
         info!("Resumed rollout successfully from {path:?}");
-        Ok(InitialHistory::Resumed(ResumedHistory {
-            conversation_id,
-            history: items,
-            rollout_path: path.to_path_buf(),
-        }))
-    }
-
-    pub(crate) fn get_rollout_path(&self) -> PathBuf {
-        self.rollout_path.clone()
+        if items.is_empty() {
+            Ok(InitialHistory::New)
+        } else {
+            Ok(InitialHistory::Resumed(items))
+        }
     }
 
     pub async fn shutdown(&self) -> std::io::Result<()> {
@@ -292,20 +226,14 @@ struct LogFileInfo {
     /// Opened file handle to the rollout file.
     file: File,
 
-    /// Full path to the rollout file.
-    path: PathBuf,
-
     /// Session ID (also embedded in filename).
-    conversation_id: ConversationId,
+    session_id: Uuid,
 
     /// Timestamp for the start of the session.
     timestamp: OffsetDateTime,
 }
 
-fn create_log_file(
-    config: &Config,
-    conversation_id: ConversationId,
-) -> std::io::Result<LogFileInfo> {
+fn create_log_file(config: &Config, session_id: Uuid) -> std::io::Result<LogFileInfo> {
     // Resolve ~/.codex/sessions/YYYY/MM/DD and create it if missing.
     let timestamp = OffsetDateTime::now_local()
         .map_err(|e| IoError::other(format!("failed to get local time: {e}")))?;
@@ -324,7 +252,7 @@ fn create_log_file(
         .format(format)
         .map_err(|e| IoError::other(format!("failed to format timestamp: {e}")))?;
 
-    let filename = format!("rollout-{date_str}-{conversation_id}.jsonl");
+    let filename = format!("rollout-{date_str}-{session_id}.jsonl");
 
     let path = dir.join(filename);
     let file = std::fs::OpenOptions::new()
@@ -334,8 +262,7 @@ fn create_log_file(
 
     Ok(LogFileInfo {
         file,
-        path,
-        conversation_id,
+        session_id,
         timestamp,
     })
 }
@@ -351,15 +278,13 @@ async fn rollout_writer(
     // If we have a meta, collect git info asynchronously and write meta first
     if let Some(session_meta) = meta.take() {
         let git_info = collect_git_info(&cwd).await;
-        let session_meta_line = SessionMetaLine {
+        let session_meta_with_git = SessionMetaWithGit {
             meta: session_meta,
             git: git_info,
         };
 
-        // Write the SessionMeta as the first item in the file, wrapped in a rollout line
-        writer
-            .write_rollout_item(RolloutItem::SessionMeta(session_meta_line))
-            .await?;
+        // Write the SessionMeta as the first item in the file
+        writer.write_line(&session_meta_with_git).await?;
     }
 
     // Process rollout commands
@@ -368,17 +293,23 @@ async fn rollout_writer(
             RolloutCmd::AddItems(items) => {
                 for item in items {
                     if is_persisted_response_item(&item) {
-                        writer.write_rollout_item(item).await?;
+                        writer.write_line(&item).await?;
                     }
                 }
             }
-            RolloutCmd::Flush { ack } => {
-                // Ensure underlying file is flushed and then ack.
-                if let Err(e) = writer.file.flush().await {
-                    let _ = ack.send(());
-                    return Err(e);
+            RolloutCmd::UpdateState(state) => {
+                #[derive(Serialize)]
+                struct StateLine<'a> {
+                    record_type: &'static str,
+                    #[serde(flatten)]
+                    state: &'a SessionStateSnapshot,
                 }
-                let _ = ack.send(());
+                writer
+                    .write_line(&StateLine {
+                        record_type: "state",
+                        state: &state,
+                    })
+                    .await?;
             }
             RolloutCmd::Shutdown { ack } => {
                 let _ = ack.send(());
@@ -394,24 +325,10 @@ struct JsonlWriter {
 }
 
 impl JsonlWriter {
-    async fn write_rollout_item(&mut self, rollout_item: RolloutItem) -> std::io::Result<()> {
-        let timestamp_format: &[FormatItem] = format_description!(
-            "[year]-[month]-[day]T[hour]:[minute]:[second].[subsecond digits:3]Z"
-        );
-        let timestamp = OffsetDateTime::now_utc()
-            .format(timestamp_format)
-            .map_err(|e| IoError::other(format!("failed to format timestamp: {e}")))?;
-
-        let line = RolloutLine {
-            timestamp,
-            item: rollout_item,
-        };
-        self.write_line(&line).await
-    }
     async fn write_line(&mut self, item: &impl serde::Serialize) -> std::io::Result<()> {
         let mut json = serde_json::to_string(item)?;
         json.push('\n');
-        self.file.write_all(json.as_bytes()).await?;
+        let _ = self.file.write_all(json.as_bytes()).await;
         self.file.flush().await?;
         Ok(())
     }

codex-rs/core/src/rollout/tests.rs

@@ -42,30 +42,10 @@ fn write_session_file(
 
     let meta = serde_json::json!({
         "timestamp": ts_str,
-        "type": "session_meta",
-        "payload": {
-            "id": uuid,
-            "timestamp": ts_str,
-            "instructions": null,
-            "cwd": ".",
-            "originator": "test_originator",
-            "cli_version": "test_version"
-        }
+        "id": uuid.to_string()
     });
     writeln!(file, "{meta}")?;
 
-    // Include at least one user message event to satisfy listing filters
-    let user_event = serde_json::json!({
-        "timestamp": ts_str,
-        "type": "event_msg",
-        "payload": {
-            "type": "user_message",
-            "message": "Hello from user",
-            "kind": "plain"
-        }
-    });
-    writeln!(file, "{user_event}")?;
-
     for i in 0..num_records {
         let rec = serde_json::json!({
             "record_type": "response",
@@ -113,30 +93,24 @@ async fn test_list_conversations_latest_first() {
         .join("01")
         .join(format!("rollout-2025-01-01T12-00-00-{u1}.jsonl"));
 
-    let head_3 = vec![serde_json::json!({
-        "id": u3,
-        "timestamp": "2025-01-03T12-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
-    let head_2 = vec![serde_json::json!({
-        "id": u2,
-        "timestamp": "2025-01-02T12-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
-    let head_1 = vec![serde_json::json!({
-        "id": u1,
-        "timestamp": "2025-01-01T12-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
+    let head_3 = vec![
+        serde_json::json!({"timestamp": "2025-01-03T12-00-00", "id": u3.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+        serde_json::json!({"record_type": "response", "index": 1}),
+        serde_json::json!({"record_type": "response", "index": 2}),
+    ];
+    let head_2 = vec![
+        serde_json::json!({"timestamp": "2025-01-02T12-00-00", "id": u2.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+        serde_json::json!({"record_type": "response", "index": 1}),
+        serde_json::json!({"record_type": "response", "index": 2}),
+    ];
+    let head_1 = vec![
+        serde_json::json!({"timestamp": "2025-01-01T12-00-00", "id": u1.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+        serde_json::json!({"record_type": "response", "index": 1}),
+        serde_json::json!({"record_type": "response", "index": 2}),
+    ];
 
     let expected_cursor: Cursor =
         serde_json::from_str(&format!("\"2025-01-01T12-00-00|{u1}\"")).unwrap();
@@ -196,22 +170,14 @@ async fn test_pagination_cursor() {
         .join("03")
         .join("04")
         .join(format!("rollout-2025-03-04T09-00-00-{u4}.jsonl"));
-    let head_5 = vec![serde_json::json!({
-        "id": u5,
-        "timestamp": "2025-03-05T09-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
-    let head_4 = vec![serde_json::json!({
-        "id": u4,
-        "timestamp": "2025-03-04T09-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
+    let head_5 = vec![
+        serde_json::json!({"timestamp": "2025-03-05T09-00-00", "id": u5.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+    ];
+    let head_4 = vec![
+        serde_json::json!({"timestamp": "2025-03-04T09-00-00", "id": u4.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+    ];
     let expected_cursor1: Cursor =
         serde_json::from_str(&format!("\"2025-03-04T09-00-00|{u4}\"")).unwrap();
     let expected_page1 = ConversationsPage {
@@ -246,22 +212,14 @@ async fn test_pagination_cursor() {
         .join("03")
         .join("02")
         .join(format!("rollout-2025-03-02T09-00-00-{u2}.jsonl"));
-    let head_3 = vec![serde_json::json!({
-        "id": u3,
-        "timestamp": "2025-03-03T09-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
-    let head_2 = vec![serde_json::json!({
-        "id": u2,
-        "timestamp": "2025-03-02T09-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
+    let head_3 = vec![
+        serde_json::json!({"timestamp": "2025-03-03T09-00-00", "id": u3.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+    ];
+    let head_2 = vec![
+        serde_json::json!({"timestamp": "2025-03-02T09-00-00", "id": u2.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+    ];
     let expected_cursor2: Cursor =
         serde_json::from_str(&format!("\"2025-03-02T09-00-00|{u2}\"")).unwrap();
     let expected_page2 = ConversationsPage {
@@ -290,14 +248,10 @@ async fn test_pagination_cursor() {
         .join("03")
         .join("01")
         .join(format!("rollout-2025-03-01T09-00-00-{u1}.jsonl"));
-    let head_1 = vec![serde_json::json!({
-        "id": u1,
-        "timestamp": "2025-03-01T09-00-00",
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
+    let head_1 = vec![
+        serde_json::json!({"timestamp": "2025-03-01T09-00-00", "id": u1.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+    ];
     let expected_cursor3: Cursor =
         serde_json::from_str(&format!("\"2025-03-01T09-00-00|{u1}\"")).unwrap();
     let expected_page3 = ConversationsPage {
@@ -333,14 +287,11 @@ async fn test_get_conversation_contents() {
         .join("04")
         .join("01")
         .join(format!("rollout-2025-04-01T10-30-00-{uuid}.jsonl"));
-    let expected_head = vec![serde_json::json!({
-        "id": uuid,
-        "timestamp": ts,
-        "instructions": null,
-        "cwd": ".",
-        "originator": "test_originator",
-        "cli_version": "test_version"
-    })];
+    let expected_head = vec![
+        serde_json::json!({"timestamp": ts, "id": uuid.to_string()}),
+        serde_json::json!({"record_type": "response", "index": 0}),
+        serde_json::json!({"record_type": "response", "index": 1}),
+    ];
     let expected_cursor: Cursor = serde_json::from_str(&format!("\"{ts}|{uuid}\"")).unwrap();
     let expected_page = ConversationsPage {
         items: vec![ConversationItem {
@@ -354,15 +305,10 @@ async fn test_get_conversation_contents() {
     assert_eq!(page, expected_page);
 
     // Entire file contents equality
-    let meta = serde_json::json!({"timestamp": ts, "type": "session_meta", "payload": {"id": uuid, "timestamp": ts, "instructions": null, "cwd": ".", "originator": "test_originator", "cli_version": "test_version"}});
-    let user_event = serde_json::json!({
-        "timestamp": ts,
-        "type": "event_msg",
-        "payload": {"type": "user_message", "message": "Hello from user", "kind": "plain"}
-    });
+    let meta = serde_json::json!({"timestamp": ts, "id": uuid.to_string()});
     let rec0 = serde_json::json!({"record_type": "response", "index": 0});
     let rec1 = serde_json::json!({"record_type": "response", "index": 1});
-    let expected_content = format!("{meta}\n{user_event}\n{rec0}\n{rec1}\n");
+    let expected_content = format!("{meta}\n{rec0}\n{rec1}\n");
     assert_eq!(content, expected_content);
 }
 
@@ -395,14 +341,7 @@ async fn test_stable_ordering_same_second_pagination() {
         .join("01")
         .join(format!("rollout-2025-07-01T00-00-00-{u2}.jsonl"));
     let head = |u: Uuid| -> Vec<serde_json::Value> {
-        vec![serde_json::json!({
-            "id": u,
-            "timestamp": ts,
-            "instructions": null,
-            "cwd": ".",
-            "originator": "test_originator",
-            "cli_version": "test_version"
-        })]
+        vec![serde_json::json!({"timestamp": ts, "id": u.to_string()})]
     };
     let expected_cursor1: Cursor = serde_json::from_str(&format!("\"{ts}|{u2}\"")).unwrap();
     let expected_page1 = ConversationsPage {

codex-rs/core/src/seatbelt_base_policy.sbpl

@@ -69,8 +69,3 @@
 ; Added on top of Chrome profile
 ; Needed for python multiprocessing on MacOS for the SemLock
 (allow ipc-posix-sem)
-
-; needed to look up user info, see https://crbug.com/792228
-(allow mach-lookup
-  (global-name "com.apple.system.opendirectoryd.libinfo")
-)

codex-rs/core/src/unified_exec/errors.rs

@@ -13,6 +13,10 @@ pub(crate) enum UnifiedExecError {
     WriteToStdin,
     #[error("missing command line for unified exec request")]
     MissingCommandLine,
+    #[error("invalid command line: {command_line}")]
+    InvalidCommandLine { command_line: String },
+    #[error("command not found: {command}")]
+    CommandNotFound { command: String },
 }
 
 impl UnifiedExecError {

codex-rs/core/src/unified_exec/mod.rs

@@ -21,9 +21,14 @@ use crate::exec_command::ExecCommandSession;
 use crate::truncate::truncate_middle;
 
 mod errors;
+mod path;
 
 pub(crate) use errors::UnifiedExecError;
 
+use path::command_from_chunks;
+use path::join_input_chunks;
+use path::resolve_command_path;
+
 const DEFAULT_TIMEOUT_MS: u64 = 1_000;
 const MAX_TIMEOUT_MS: u64 = 60_000;
 const UNIFIED_EXEC_OUTPUT_MAX_BYTES: usize = 128 * 1024; // 128 KiB
@@ -51,8 +56,6 @@ pub(crate) struct UnifiedExecSessionManager {
 struct ManagedUnifiedExecSession {
     session: ExecCommandSession,
     output_buffer: OutputBuffer,
-    /// Notifies waiters whenever new output has been appended to
-    /// `output_buffer`, allowing clients to poll for fresh data.
     output_notify: Arc<Notify>,
     output_task: JoinHandle<()>,
 }
@@ -68,21 +71,10 @@ impl OutputBufferState {
         self.total_bytes = self.total_bytes.saturating_add(chunk.len());
         self.chunks.push_back(chunk);
 
-        let mut excess = self
-            .total_bytes
-            .saturating_sub(UNIFIED_EXEC_OUTPUT_MAX_BYTES);
-
-        while excess > 0 {
-            match self.chunks.front_mut() {
-                Some(front) if excess >= front.len() => {
-                    excess -= front.len();
-                    self.total_bytes = self.total_bytes.saturating_sub(front.len());
-                    self.chunks.pop_front();
-                }
-                Some(front) => {
-                    front.drain(..excess);
-                    self.total_bytes = self.total_bytes.saturating_sub(excess);
-                    break;
+        while self.total_bytes > UNIFIED_EXEC_OUTPUT_MAX_BYTES {
+            match self.chunks.pop_front() {
+                Some(removed) => {
+                    self.total_bytes = self.total_bytes.saturating_sub(removed.len());
                 }
                 None => break,
             }
@@ -191,7 +183,7 @@ impl UnifiedExecSessionManager {
             }
             drop(sessions);
         } else {
-            let command = request.input_chunks.to_vec();
+            let command = command_from_chunks(request.input_chunks)?;
             let new_id = self.next_session_id.fetch_add(1, Ordering::SeqCst);
             let session = create_unified_exec_session(&command).await?;
             let managed_session = ManagedUnifiedExecSession::new(session);
@@ -204,7 +196,7 @@ impl UnifiedExecSessionManager {
         };
 
         if request.session_id.is_some() {
-            let joined_input = request.input_chunks.join(" ");
+            let joined_input = join_input_chunks(request.input_chunks);
             if !joined_input.is_empty() && writer_tx.send(joined_input.into_bytes()).await.is_err()
             {
                 return Err(UnifiedExecError::WriteToStdin);
@@ -227,11 +219,11 @@ impl UnifiedExecSessionManager {
             }
 
             if drained_chunks.is_empty() {
-                let remaining = deadline.saturating_duration_since(Instant::now());
-                if remaining == Duration::ZERO {
+                if Instant::now() >= deadline {
                     break;
                 }
 
+                let remaining = deadline.saturating_duration_since(Instant::now());
                 let notified = wait_for_output.unwrap_or_else(|| output_notify.notified());
                 tokio::pin!(notified);
                 tokio::select! {
@@ -313,8 +305,8 @@ async fn create_unified_exec_session(
         })
         .map_err(UnifiedExecError::create_session)?;
 
-    // Safe thanks to the check at the top of the function.
-    let mut command_builder = CommandBuilder::new(command[0].clone());
+    let resolved_command = resolve_command_path(&command[0])?;
+    let mut command_builder = CommandBuilder::new(&resolved_command);
     for arg in &command[1..] {
         command_builder.arg(arg);
     }
@@ -393,28 +385,34 @@ async fn create_unified_exec_session(
 
 #[cfg(test)]
 mod tests {
+    use super::path::parse_command_line;
     use super::*;
 
     #[test]
-    fn push_chunk_trims_only_excess_bytes() {
-        let mut buffer = OutputBufferState::default();
-        buffer.push_chunk(vec![b'a'; UNIFIED_EXEC_OUTPUT_MAX_BYTES]);
-        buffer.push_chunk(vec![b'b']);
-        buffer.push_chunk(vec![b'c']);
-
-        assert_eq!(buffer.total_bytes, UNIFIED_EXEC_OUTPUT_MAX_BYTES);
-        assert_eq!(buffer.chunks.len(), 3);
+    fn parse_command_line_splits_words() {
         assert_eq!(
-            buffer.chunks.front().unwrap().len(),
-            UNIFIED_EXEC_OUTPUT_MAX_BYTES - 2
+            parse_command_line("echo codex").unwrap(),
+            vec!["echo".to_string(), "codex".to_string()]
         );
-        assert_eq!(buffer.chunks.pop_back().unwrap(), vec![b'c']);
-        assert_eq!(buffer.chunks.pop_back().unwrap(), vec![b'b']);
+    }
+
+    #[test]
+    fn parse_command_line_trims_whitespace() {
+        assert_eq!(
+            parse_command_line("  ls  -la  \n").unwrap(),
+            vec!["ls".to_string(), "-la".to_string()]
+        );
+    }
+
+    #[test]
+    fn parse_command_line_rejects_empty() {
+        let err = parse_command_line("   ").expect_err("expected error");
+        assert!(matches!(err, UnifiedExecError::MissingCommandLine));
     }
 
     #[cfg(unix)]
     #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-    async fn unified_exec_persists_across_requests_jif() -> Result<(), UnifiedExecError> {
+    async fn unified_exec_persists_across_requests() -> Result<(), UnifiedExecError> {
         let manager = UnifiedExecSessionManager::default();
 
         let open_shell = manager
@@ -429,11 +427,8 @@ mod tests {
         manager
             .handle_request(UnifiedExecRequest {
                 session_id: Some(session_id),
-                input_chunks: &[
-                    "export".to_string(),
-                    "CODEX_INTERACTIVE_SHELL_VAR=codex\n".to_string(),
-                ],
-                timeout_ms: Some(2_500),
+                input_chunks: &["export CODEX_INTERACTIVE_SHELL_VAR=codex\n".to_string()],
+                timeout_ms: Some(1_500),
             })
             .await?;
 
@@ -444,6 +439,7 @@ mod tests {
                 timeout_ms: Some(1_500),
             })
             .await?;
+
         assert!(out_2.output.contains("codex"));
 
         Ok(())
@@ -474,10 +470,7 @@ mod tests {
         let out_2 = manager
             .handle_request(UnifiedExecRequest {
                 session_id: None,
-                input_chunks: &[
-                    "echo".to_string(),
-                    "$CODEX_INTERACTIVE_SHELL_VAR\n".to_string(),
-                ],
+                input_chunks: &["/bin/echo $CODEX_INTERACTIVE_SHELL_VAR\n".to_string()],
                 timeout_ms: Some(1_500),
             })
             .await?;
@@ -503,7 +496,7 @@ mod tests {
         let open_shell = manager
             .handle_request(UnifiedExecRequest {
                 session_id: None,
-                input_chunks: &["bash".to_string(), "-i".to_string()],
+                input_chunks: &["/bin/bash".to_string(), "-i".to_string()],
                 timeout_ms: Some(1_500),
             })
             .await?;
@@ -512,10 +505,7 @@ mod tests {
         manager
             .handle_request(UnifiedExecRequest {
                 session_id: Some(session_id),
-                input_chunks: &[
-                    "export".to_string(),
-                    "CODEX_INTERACTIVE_SHELL_VAR=codex\n".to_string(),
-                ],
+                input_chunks: &["export CODEX_INTERACTIVE_SHELL_VAR=codex\n".to_string()],
                 timeout_ms: Some(1_500),
             })
             .await?;
@@ -553,7 +543,7 @@ mod tests {
         let result = manager
             .handle_request(UnifiedExecRequest {
                 session_id: None,
-                input_chunks: &["echo".to_string(), "codex".to_string()],
+                input_chunks: &["/bin/echo".to_string(), "codex".to_string()],
                 timeout_ms: Some(120_000),
             })
             .await?;

codex-rs/core/src/unified_exec/path.rs

@@ -0,0 +1,194 @@
+use std::env;
+use std::path::Path;
+use std::path::PathBuf;
+
+use super::errors::UnifiedExecError;
+
+pub(crate) fn parse_command_line(line: &str) -> Result<Vec<String>, UnifiedExecError> {
+    let trimmed = line.trim();
+    if trimmed.is_empty() {
+        return Err(UnifiedExecError::MissingCommandLine);
+    }
+
+    match parse_command_line_impl(trimmed) {
+        Some(parts) if !parts.is_empty() => Ok(parts),
+        _ => Err(UnifiedExecError::InvalidCommandLine {
+            command_line: trimmed.to_string(),
+        }),
+    }
+}
+
+#[cfg(not(windows))]
+fn parse_command_line_impl(trimmed: &str) -> Option<Vec<String>> {
+    shlex::split(trimmed)
+}
+
+#[cfg(windows)]
+fn parse_command_line_impl(trimmed: &str) -> Option<Vec<String>> {
+    windows_split_command_line(trimmed)
+}
+
+#[cfg(windows)]
+fn windows_split_command_line(input: &str) -> Option<Vec<String>> {
+    let mut args = Vec::new();
+    let mut current = String::new();
+    let mut in_quotes = false;
+    let mut backslashes = 0usize;
+
+    for ch in input.chars() {
+        match ch {
+            '\\' => {
+                backslashes += 1;
+            }
+            '"' => {
+                current.extend(std::iter::repeat_n('\\', backslashes / 2));
+                if backslashes % 2 == 0 {
+                    in_quotes = !in_quotes;
+                } else {
+                    current.push('"');
+                }
+                backslashes = 0;
+            }
+            c if c.is_whitespace() && !in_quotes => {
+                current.extend(std::iter::repeat_n('\\', backslashes));
+                backslashes = 0;
+                if !current.is_empty() {
+                    args.push(std::mem::take(&mut current));
+                }
+            }
+            other => {
+                current.extend(std::iter::repeat_n('\\', backslashes));
+                backslashes = 0;
+                current.push(other);
+            }
+        }
+    }
+
+    if in_quotes {
+        return None;
+    }
+
+    current.extend(std::iter::repeat_n('\\', backslashes));
+    if !current.is_empty() {
+        args.push(current);
+    }
+
+    if args.is_empty() { None } else { Some(args) }
+}
+
+pub(crate) fn command_from_chunks(chunks: &[String]) -> Result<Vec<String>, UnifiedExecError> {
+    match chunks {
+        [] => Err(UnifiedExecError::MissingCommandLine),
+        [single] => parse_command_line(single),
+        _ => Ok(chunks.to_vec()),
+    }
+}
+
+pub(crate) fn join_input_chunks(chunks: &[String]) -> String {
+    match chunks {
+        [] => String::new(),
+        [single] => single.clone(),
+        _ => chunks.concat(),
+    }
+}
+
+pub(crate) fn resolve_command_path(command: &str) -> Result<String, UnifiedExecError> {
+    if command.is_empty() {
+        return Err(UnifiedExecError::MissingCommandLine);
+    }
+
+    if is_explicit_path(command) {
+        return ensure_executable(Path::new(command))
+            .then_some(command.to_string())
+            .ok_or_else(|| UnifiedExecError::CommandNotFound {
+                command: command.to_string(),
+            });
+    }
+
+    if let Some(resolved) = find_in_path(command) {
+        return Ok(resolved.to_string_lossy().to_string());
+    }
+
+    Err(UnifiedExecError::CommandNotFound {
+        command: command.to_string(),
+    })
+}
+
+fn is_explicit_path(command: &str) -> bool {
+    let path = Path::new(command);
+    path.is_absolute() || path.components().count() > 1
+}
+
+fn find_in_path(command: &str) -> Option<PathBuf> {
+    let path_var = env::var_os("PATH")?;
+    env::split_paths(&path_var)
+        .flat_map(|dir| candidate_paths(dir, command))
+        .find(|candidate| ensure_executable(candidate))
+}
+
+fn candidate_paths(dir: PathBuf, command: &str) -> Vec<PathBuf> {
+    build_platform_candidates(dir.join(command))
+}
+
+#[cfg(unix)]
+fn build_platform_candidates(candidate: PathBuf) -> Vec<PathBuf> {
+    vec![candidate]
+}
+
+#[cfg(windows)]
+fn build_platform_candidates(candidate: PathBuf) -> Vec<PathBuf> {
+    if candidate.extension().is_some() {
+        return vec![candidate];
+    }
+
+    let pathext = env::var("PATHEXT").unwrap_or_else(|_| ".COM;.EXE;.BAT;.CMD".to_string());
+    let mut candidates = Vec::new();
+    for ext in pathext.split(';') {
+        if ext.is_empty() {
+            continue;
+        }
+        let mut path_with_ext = candidate.clone();
+        let new_ext = ext.trim_start_matches('.');
+        path_with_ext.set_extension(new_ext);
+        candidates.push(path_with_ext);
+    }
+    if candidates.is_empty() {
+        candidates.push(candidate);
+    }
+    candidates
+}
+
+fn ensure_executable(path: &Path) -> bool {
+    match path.metadata() {
+        Ok(metadata) => metadata.is_file() && is_executable(&metadata),
+        Err(_) => false,
+    }
+}
+
+#[cfg(unix)]
+fn is_executable(metadata: &std::fs::Metadata) -> bool {
+    use std::os::unix::fs::PermissionsExt;
+    metadata.permissions().mode() & 0o111 != 0
+}
+
+#[cfg(not(unix))]
+fn is_executable(metadata: &std::fs::Metadata) -> bool {
+    metadata.is_file()
+}
+
+#[cfg(all(test, windows))]
+mod tests {
+    use super::parse_command_line;
+
+    #[test]
+    fn parses_windows_command_with_spaces() {
+        let out = parse_command_line(r#""C:\Program Files\Git\bin\bash.exe" -i"#).unwrap();
+        assert_eq!(
+            out,
+            vec![
+                "C:\\Program Files\\Git\\bin\\bash.exe".to_string(),
+                "-i".to_string(),
+            ]
+        );
+    }
+}

codex-rs/core/tests/chat_completions_payload.rs

@@ -11,11 +11,11 @@ use codex_core::ReasoningItemContent;
 use codex_core::ResponseItem;
 use codex_core::WireApi;
 use codex_core::spawn::CODEX_SANDBOX_NETWORK_DISABLED_ENV_VAR;
-use codex_protocol::mcp_protocol::ConversationId;
 use core_test_support::load_default_config_for_test;
 use futures::StreamExt;
 use serde_json::Value;
 use tempfile::TempDir;
+use uuid::Uuid;
 use wiremock::Mock;
 use wiremock::MockServer;
 use wiremock::ResponseTemplate;
@@ -76,7 +76,7 @@ async fn run_request(input: Vec<ResponseItem>) -> Value {
         provider,
         effort,
         summary,
-        ConversationId::new(),
+        Uuid::new_v4(),
     );
 
     let mut prompt = Prompt::default();

codex-rs/core/tests/chat_completions_sse.rs

@@ -8,10 +8,10 @@ use codex_core::ResponseEvent;
 use codex_core::ResponseItem;
 use codex_core::WireApi;
 use codex_core::spawn::CODEX_SANDBOX_NETWORK_DISABLED_ENV_VAR;
-use codex_protocol::mcp_protocol::ConversationId;
 use core_test_support::load_default_config_for_test;
 use futures::StreamExt;
 use tempfile::TempDir;
+use uuid::Uuid;
 use wiremock::Mock;
 use wiremock::MockServer;
 use wiremock::ResponseTemplate;
@@ -69,7 +69,7 @@ async fn run_stream(sse_body: &str) -> Vec<ResponseEvent> {
         provider,
         effort,
         summary,
-        ConversationId::new(),
+        Uuid::new_v4(),
     );
 
     let mut prompt = Prompt::default();

codex-rs/core/tests/suite/cli_stream.rs

@@ -1,6 +1,4 @@
 use assert_cmd::Command as AssertCommand;
-use codex_core::RolloutRecorder;
-use codex_core::protocol::GitInfo;
 use codex_core::spawn::CODEX_SANDBOX_NETWORK_DISABLED_ENV_VAR;
 use std::time::Duration;
 use std::time::Instant;
@@ -79,22 +77,6 @@ async fn chat_mode_stream_cli() {
     assert_eq!(hi_lines, 1, "Expected exactly one line with 'hi'");
 
     server.verify().await;
-
-    // Verify a new session rollout was created and is discoverable via list_conversations
-    let page = RolloutRecorder::list_conversations(home.path(), 10, None)
-        .await
-        .expect("list conversations");
-    assert!(
-        !page.items.is_empty(),
-        "expected at least one session to be listed"
-    );
-    // First line of head must be the SessionMeta payload (id/timestamp)
-    let head0 = page.items[0].head.first().expect("missing head record");
-    assert!(head0.get("id").is_some(), "head[0] missing id");
-    assert!(
-        head0.get("timestamp").is_some(),
-        "head[0] missing timestamp"
-    );
 }
 
 /// Verify that passing `-c experimental_instructions_file=...` to the CLI
@@ -315,10 +297,8 @@ async fn integration_creates_and_checks_session_file() {
                     Ok(v) => v,
                     Err(_) => continue,
                 };
-                if item.get("type").and_then(|t| t.as_str()) == Some("response_item")
-                    && let Some(payload) = item.get("payload")
-                    && payload.get("type").and_then(|t| t.as_str()) == Some("message")
-                    && let Some(c) = payload.get("content")
+                if item.get("type").and_then(|t| t.as_str()) == Some("message")
+                    && let Some(c) = item.get("content")
                     && c.to_string().contains(&marker)
                 {
                     matching_path = Some(path.to_path_buf());
@@ -381,16 +361,9 @@ async fn integration_creates_and_checks_session_file() {
         .unwrap_or_else(|_| panic!("missing session meta line"));
     let meta: serde_json::Value = serde_json::from_str(meta_line)
         .unwrap_or_else(|_| panic!("Failed to parse session meta line as JSON"));
-    assert_eq!(
-        meta.get("type").and_then(|v| v.as_str()),
-        Some("session_meta")
-    );
-    let payload = meta
-        .get("payload")
-        .unwrap_or_else(|| panic!("Missing payload in meta line"));
-    assert!(payload.get("id").is_some(), "SessionMeta missing id");
+    assert!(meta.get("id").is_some(), "SessionMeta missing id");
     assert!(
-        payload.get("timestamp").is_some(),
+        meta.get("timestamp").is_some(),
         "SessionMeta missing timestamp"
     );
 
@@ -402,10 +375,8 @@ async fn integration_creates_and_checks_session_file() {
         let Ok(item) = serde_json::from_str::<serde_json::Value>(line) else {
             continue;
         };
-        if item.get("type").and_then(|t| t.as_str()) == Some("response_item")
-            && let Some(payload) = item.get("payload")
-            && payload.get("type").and_then(|t| t.as_str()) == Some("message")
-            && let Some(c) = payload.get("content")
+        if item.get("type").and_then(|t| t.as_str()) == Some("message")
+            && let Some(c) = item.get("content")
             && c.to_string().contains(&marker)
         {
             found_message = true;
@@ -417,7 +388,8 @@ async fn integration_creates_and_checks_session_file() {
         "No message found in session file containing the marker"
     );
 
-    // Second run: resume should update the existing file.
+    // Second run: resume should create a NEW session file that contains both old and new history.
+    let orig_len = content.lines().count();
     let marker2 = format!("integration-resume-{}", Uuid::new_v4());
     let prompt2 = format!("echo {marker2}");
     // Cross‑platform safe resume override.  On Windows, backslashes in a TOML string must be escaped
@@ -477,8 +449,8 @@ async fn integration_creates_and_checks_session_file() {
     }
 
     let resumed_path = resumed_path.expect("No resumed session file found containing the marker2");
-    // Resume should write to the existing log file.
-    assert_eq!(
+    // Resume should have written to a new file, not the original one.
+    assert_ne!(
         resumed_path, path,
         "resume should create a new session file"
     );
@@ -492,6 +464,14 @@ async fn integration_creates_and_checks_session_file() {
         resumed_content.contains(&marker2),
         "resumed file missing resumed marker"
     );
+
+    // Original file should remain unchanged.
+    let content_after = std::fs::read_to_string(&path).unwrap();
+    assert_eq!(
+        content_after.lines().count(),
+        orig_len,
+        "original rollout file should not change on resume"
+    );
 }
 
 /// Integration test to verify git info is collected and recorded in session files.
@@ -618,7 +598,7 @@ async fn integration_git_info_unit_test() {
 
     // 5. Test serialization to ensure it works in SessionMeta
     let serialized = serde_json::to_string(&git_info).unwrap();
-    let deserialized: GitInfo = serde_json::from_str(&serialized).unwrap();
+    let deserialized: codex_core::git_info::GitInfo = serde_json::from_str(&serialized).unwrap();
 
     assert_eq!(git_info.commit_hash, deserialized.commit_hash);
     assert_eq!(git_info.branch, deserialized.branch);

codex-rs/core/tests/suite/client.rs

@@ -15,7 +15,6 @@ use core_test_support::wait_for_event;
 use serde_json::json;
 use std::io::Write;
 use tempfile::TempDir;
-use uuid::Uuid;
 use wiremock::Mock;
 use wiremock::MockServer;
 use wiremock::ResponseTemplate;
@@ -123,22 +122,11 @@ async fn resume_includes_initial_messages_and_sends_prior_items() {
     let tmpdir = TempDir::new().unwrap();
     let session_path = tmpdir.path().join("resume-session.jsonl");
     let mut f = std::fs::File::create(&session_path).unwrap();
-    let convo_id = Uuid::new_v4();
+    // First line: meta (content not used by reader other than non-empty)
     writeln!(
         f,
         "{}",
-        json!({
-            "timestamp": "2024-01-01T00:00:00.000Z",
-            "type": "session_meta",
-            "payload": {
-                "id": convo_id,
-                "timestamp": "2024-01-01T00:00:00Z",
-                "instructions": "be nice",
-                "cwd": ".",
-                "originator": "test_originator",
-                "cli_version": "test_version"
-            }
-        })
+        serde_json::json!({"meta":"test","instructions":"be nice"})
     )
     .unwrap();
 
@@ -150,17 +138,7 @@ async fn resume_includes_initial_messages_and_sends_prior_items() {
             text: "resumed user message".to_string(),
         }],
     };
-    let prior_user_json = serde_json::to_value(&prior_user).unwrap();
-    writeln!(
-        f,
-        "{}",
-        json!({
-            "timestamp": "2024-01-01T00:00:01.000Z",
-            "type": "response_item",
-            "payload": prior_user_json
-        })
-    )
-    .unwrap();
+    writeln!(f, "{}", serde_json::to_string(&prior_user).unwrap()).unwrap();
 
     // Prior item: system message (excluded from API history)
     let prior_system = codex_protocol::models::ResponseItem::Message {
@@ -170,17 +148,7 @@ async fn resume_includes_initial_messages_and_sends_prior_items() {
             text: "resumed system instruction".to_string(),
         }],
     };
-    let prior_system_json = serde_json::to_value(&prior_system).unwrap();
-    writeln!(
-        f,
-        "{}",
-        json!({
-            "timestamp": "2024-01-01T00:00:02.000Z",
-            "type": "response_item",
-            "payload": prior_system_json
-        })
-    )
-    .unwrap();
+    writeln!(f, "{}", serde_json::to_string(&prior_system).unwrap()).unwrap();
 
     // Prior item: assistant message
     let prior_item = codex_protocol::models::ResponseItem::Message {
@@ -190,17 +158,7 @@ async fn resume_includes_initial_messages_and_sends_prior_items() {
             text: "resumed assistant message".to_string(),
         }],
     };
-    let prior_item_json = serde_json::to_value(&prior_item).unwrap();
-    writeln!(
-        f,
-        "{}",
-        json!({
-            "timestamp": "2024-01-01T00:00:03.000Z",
-            "type": "response_item",
-            "payload": prior_item_json
-        })
-    )
-    .unwrap();
+    writeln!(f, "{}", serde_json::to_string(&prior_item).unwrap()).unwrap();
     drop(f);
 
     // Mock server that will receive the resumed request
@@ -238,13 +196,16 @@ async fn resume_includes_initial_messages_and_sends_prior_items() {
         .await
         .expect("create new conversation");
 
-    // 1) Assert initial_messages only includes existing EventMsg entries; response items are not converted
+    // 1) Assert initial_messages contains the prior user + assistant messages as EventMsg entries
     let initial_msgs = session_configured
         .initial_messages
         .clone()
-        .expect("expected initial messages option for resumed session");
+        .expect("expected initial messages for resumed session");
     let initial_json = serde_json::to_value(&initial_msgs).unwrap();
-    let expected_initial_json = json!([]);
+    let expected_initial_json = serde_json::json!([
+        { "type": "user_message", "message": "resumed user message", "kind": "plain" },
+        { "type": "agent_message", "message": "resumed assistant message" }
+    ]);
     assert_eq!(initial_json, expected_initial_json);
 
     // 2) Submit new input; the request body must include the prior item followed by the new user input.
@@ -260,7 +221,7 @@ async fn resume_includes_initial_messages_and_sends_prior_items() {
 
     let request = &server.received_requests().await.unwrap()[0];
     let request_body = request.body_json::<serde_json::Value>().unwrap();
-    let expected_input = json!([
+    let expected_input = serde_json::json!([
         {
             "type": "message",
             "role": "user",
@@ -277,29 +238,11 @@ async fn resume_includes_initial_messages_and_sends_prior_items() {
             "content": [{ "type": "input_text", "text": "hello" }]
         }
     ]);
-    let input_array = request_body
-        .get("input")
-        .and_then(|v| v.as_array())
-        .cloned()
-        .expect("input array in request body");
-    let filtered: Vec<serde_json::Value> = input_array
-        .into_iter()
-        .filter(|item| {
-            let text = item
-                .get("content")
-                .and_then(|c| c.as_array())
-                .and_then(|a| a.first())
-                .and_then(|o| o.get("text"))
-                .and_then(|t| t.as_str())
-                .unwrap_or("");
-            !text.contains("<environment_context>")
-        })
-        .collect();
-    assert_eq!(serde_json::json!(filtered), expected_input);
+    assert_eq!(request_body["input"], expected_input);
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn includes_conversation_id_and_model_headers_in_request() {
+async fn includes_session_id_and_model_headers_in_request() {
     if std::env::var(CODEX_SANDBOX_NETWORK_DISABLED_ENV_VAR).is_ok() {
         println!(
             "Skipping test because it cannot execute when network is disabled in a Codex sandbox."
@@ -356,12 +299,12 @@ async fn includes_conversation_id_and_model_headers_in_request() {
 
     // get request from the server
     let request = &server.received_requests().await.unwrap()[0];
-    let request_conversation_id = request.headers.get("conversation_id").unwrap();
+    let request_session_id = request.headers.get("session_id").unwrap();
     let request_authorization = request.headers.get("authorization").unwrap();
     let request_originator = request.headers.get("originator").unwrap();
 
     assert_eq!(
-        request_conversation_id.to_str().unwrap(),
+        request_session_id.to_str().unwrap(),
         conversation_id.to_string()
     );
     assert_eq!(request_originator.to_str().unwrap(), "codex_cli_rs");
@@ -428,6 +371,56 @@ async fn includes_base_instructions_override_in_request() {
     );
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn originator_config_override_is_used() {
+    // Mock server
+    let server = MockServer::start().await;
+
+    let first = ResponseTemplate::new(200)
+        .insert_header("content-type", "text/event-stream")
+        .set_body_raw(sse_completed("resp1"), "text/event-stream");
+
+    Mock::given(method("POST"))
+        .and(path("/v1/responses"))
+        .respond_with(first)
+        .expect(1)
+        .mount(&server)
+        .await;
+
+    let model_provider = ModelProviderInfo {
+        base_url: Some(format!("{}/v1", server.uri())),
+        ..built_in_model_providers()["openai"].clone()
+    };
+
+    let codex_home = TempDir::new().unwrap();
+    let mut config = load_default_config_for_test(&codex_home);
+    config.model_provider = model_provider;
+    config.responses_originator_header = "my_override".to_owned();
+
+    let conversation_manager =
+        ConversationManager::with_auth(CodexAuth::from_api_key("Test API Key"));
+    let codex = conversation_manager
+        .new_conversation(config)
+        .await
+        .expect("create new conversation")
+        .conversation;
+
+    codex
+        .submit(Op::UserInput {
+            items: vec![InputItem::Text {
+                text: "hello".into(),
+            }],
+        })
+        .await
+        .unwrap();
+
+    wait_for_event(&codex, |ev| matches!(ev, EventMsg::TaskComplete(_))).await;
+
+    let request = &server.received_requests().await.unwrap()[0];
+    let request_originator = request.headers.get("originator").unwrap();
+    assert_eq!(request_originator.to_str().unwrap(), "my_override");
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn chatgpt_auth_sends_correct_request() {
     if std::env::var(CODEX_SANDBOX_NETWORK_DISABLED_ENV_VAR).is_ok() {
@@ -484,14 +477,14 @@ async fn chatgpt_auth_sends_correct_request() {
 
     // get request from the server
     let request = &server.received_requests().await.unwrap()[0];
-    let request_conversation_id = request.headers.get("conversation_id").unwrap();
+    let request_session_id = request.headers.get("session_id").unwrap();
     let request_authorization = request.headers.get("authorization").unwrap();
     let request_originator = request.headers.get("originator").unwrap();
     let request_chatgpt_account_id = request.headers.get("chatgpt-account-id").unwrap();
     let request_body = request.body_json::<serde_json::Value>().unwrap();
 
     assert_eq!(
-        request_conversation_id.to_str().unwrap(),
+        request_session_id.to_str().unwrap(),
         conversation_id.to_string()
     );
     assert_eq!(request_originator.to_str().unwrap(), "codex_cli_rs");
@@ -553,12 +546,15 @@ async fn prefers_chatgpt_token_when_config_prefers_chatgpt() {
     config.model_provider = model_provider;
     config.preferred_auth_method = AuthMode::ChatGPT;
 
-    let auth_manager =
-        match CodexAuth::from_codex_home(codex_home.path(), config.preferred_auth_method) {
-            Ok(Some(auth)) => codex_core::AuthManager::from_auth_for_testing(auth),
-            Ok(None) => panic!("No CodexAuth found in codex_home"),
-            Err(e) => panic!("Failed to load CodexAuth: {e}"),
-        };
+    let auth_manager = match CodexAuth::from_codex_home(
+        codex_home.path(),
+        config.preferred_auth_method,
+        &config.responses_originator_header,
+    ) {
+        Ok(Some(auth)) => codex_core::AuthManager::from_auth_for_testing(auth),
+        Ok(None) => panic!("No CodexAuth found in codex_home"),
+        Err(e) => panic!("Failed to load CodexAuth: {e}"),
+    };
     let conversation_manager = ConversationManager::new(auth_manager);
     let NewConversation {
         conversation: codex,
@@ -626,12 +622,15 @@ async fn prefers_apikey_when_config_prefers_apikey_even_with_chatgpt_tokens() {
     config.model_provider = model_provider;
     config.preferred_auth_method = AuthMode::ApiKey;
 
-    let auth_manager =
-        match CodexAuth::from_codex_home(codex_home.path(), config.preferred_auth_method) {
-            Ok(Some(auth)) => codex_core::AuthManager::from_auth_for_testing(auth),
-            Ok(None) => panic!("No CodexAuth found in codex_home"),
-            Err(e) => panic!("Failed to load CodexAuth: {e}"),
-        };
+    let auth_manager = match CodexAuth::from_codex_home(
+        codex_home.path(),
+        config.preferred_auth_method,
+        &config.responses_originator_header,
+    ) {
+        Ok(Some(auth)) => codex_core::AuthManager::from_auth_for_testing(auth),
+        Ok(None) => panic!("No CodexAuth found in codex_home"),
+        Err(e) => panic!("Failed to load CodexAuth: {e}"),
+    };
     let conversation_manager = ConversationManager::new(auth_manager);
     let NewConversation {
         conversation: codex,
@@ -968,6 +967,34 @@ async fn history_dedupes_streamed_and_final_messages_across_turns() {
     assert_eq!(requests.len(), 3, "expected 3 requests (one per turn)");
 
     // Replace full-array compare with tail-only raw JSON compare using a single hard-coded value.
+    let r3_tail_expected = serde_json::json!([
+        {
+            "type": "message",
+            "role": "user",
+            "content": [{"type":"input_text","text":"U1"}]
+        },
+        {
+            "type": "message",
+            "role": "assistant",
+            "content": [{"type":"output_text","text":"Hey there!\n"}]
+        },
+        {
+            "type": "message",
+            "role": "user",
+            "content": [{"type":"input_text","text":"U2"}]
+        },
+        {
+            "type": "message",
+            "role": "assistant",
+            "content": [{"type":"output_text","text":"Hey there!\n"}]
+        },
+        {
+            "type": "message",
+            "role": "user",
+            "content": [{"type":"input_text","text":"U3"}]
+        }
+    ]);
+
     let r3_input_array = requests[2]
         .body_json::<serde_json::Value>()
         .unwrap()
@@ -975,60 +1002,12 @@ async fn history_dedupes_streamed_and_final_messages_across_turns() {
         .and_then(|v| v.as_array())
         .cloned()
         .expect("r3 missing input array");
-    // We only assert on the last 5 items of the input history for request 3.
-    // With per-turn environment context injected, the last 5 should be:
-    // [env_ctx, U2, assistant("Hey there!\n"), env_ctx, U3]
-    let actual_tail = &r3_input_array[r3_input_array.len() - 5..];
-
-    // env_ctx 1
-    assert_eq!(actual_tail[0]["type"], serde_json::json!("message"));
-    assert_eq!(actual_tail[0]["role"], serde_json::json!("user"));
-    let env_text_1 = &actual_tail[0]["content"][0]["text"];
-    assert!(
-        env_text_1
-            .as_str()
-            .expect("env text should be string")
-            .contains("<environment_context>")
-    );
-
-    // U2
+    // skipping earlier context and developer messages
+    let tail_len = r3_tail_expected.as_array().unwrap().len();
+    let actual_tail = &r3_input_array[r3_input_array.len() - tail_len..];
     assert_eq!(
-        actual_tail[1],
-        serde_json::json!({
-            "type": "message",
-            "role": "user",
-            "content": [ { "type": "input_text", "text": "U2" } ]
-        })
-    );
-
-    // assistant response
-    assert_eq!(
-        actual_tail[2],
-        serde_json::json!({
-            "type": "message",
-            "role": "assistant",
-            "content": [ { "type": "output_text", "text": "Hey there!\n" } ]
-        })
-    );
-
-    // env_ctx 2
-    assert_eq!(actual_tail[3]["type"], serde_json::json!("message"));
-    assert_eq!(actual_tail[3]["role"], serde_json::json!("user"));
-    let env_text_2 = &actual_tail[3]["content"][0]["text"];
-    assert!(
-        env_text_2
-            .as_str()
-            .expect("env text should be string")
-            .contains("<environment_context>")
-    );
-
-    // U3
-    assert_eq!(
-        actual_tail[4],
-        serde_json::json!({
-            "type": "message",
-            "role": "user",
-            "content": [ { "type": "input_text", "text": "U3" } ]
-        })
+        serde_json::Value::Array(actual_tail.to_vec()),
+        r3_tail_expected,
+        "request 3 tail mismatch",
     );
 }

codex-rs/core/tests/suite/fork_conversation.rs

@@ -1,16 +1,12 @@
 use codex_core::CodexAuth;
-use codex_core::ContentItem;
 use codex_core::ConversationManager;
 use codex_core::ModelProviderInfo;
 use codex_core::NewConversation;
-use codex_core::ResponseItem;
 use codex_core::built_in_model_providers;
-use codex_core::protocol::ConversationPathResponseEvent;
+use codex_core::protocol::ConversationHistoryResponseEvent;
 use codex_core::protocol::EventMsg;
 use codex_core::protocol::InputItem;
 use codex_core::protocol::Op;
-use codex_core::protocol::RolloutItem;
-use codex_core::protocol::RolloutLine;
 use core_test_support::load_default_config_for_test;
 use core_test_support::wait_for_event;
 use tempfile::TempDir;
@@ -75,121 +71,84 @@ async fn fork_conversation_twice_drops_to_first_message() {
         let _ = wait_for_event(&codex, |ev| matches!(ev, EventMsg::TaskComplete(_))).await;
     }
 
-    // Request history from the base conversation to obtain rollout path.
-    codex.submit(Op::GetPath).await.unwrap();
+    // Request history from the base conversation.
+    codex.submit(Op::GetHistory).await.unwrap();
     let base_history =
-        wait_for_event(&codex, |ev| matches!(ev, EventMsg::ConversationPath(_))).await;
-    let base_path = match &base_history {
-        EventMsg::ConversationPath(ConversationPathResponseEvent { path, .. }) => path.clone(),
+        wait_for_event(&codex, |ev| matches!(ev, EventMsg::ConversationHistory(_))).await;
+
+    // Capture entries from the base history and compute expected prefixes after each fork.
+    let entries_after_three = match &base_history {
+        EventMsg::ConversationHistory(ConversationHistoryResponseEvent { entries, .. }) => {
+            entries.clone()
+        }
         _ => panic!("expected ConversationHistory event"),
     };
+    // History layout for this test:
+    // [0] user instructions,
+    // [1] environment context,
+    // [2] "first" user message,
+    // [3] "second" user message,
+    // [4] "third" user message.
 
-    // GetHistory flushes before returning the path; no wait needed.
+    // Fork 1: drops the last user message and everything after.
+    let expected_after_first = vec![
+        entries_after_three[0].clone(),
+        entries_after_three[1].clone(),
+        entries_after_three[2].clone(),
+        entries_after_three[3].clone(),
+    ];
 
-    // Helper: read rollout items (excluding SessionMeta) from a JSONL path.
-    let read_items = |p: &std::path::Path| -> Vec<RolloutItem> {
-        let text = std::fs::read_to_string(p).expect("read rollout file");
-        let mut items: Vec<RolloutItem> = Vec::new();
-        for line in text.lines() {
-            if line.trim().is_empty() {
-                continue;
-            }
-            let v: serde_json::Value = serde_json::from_str(line).expect("jsonl line");
-            let rl: RolloutLine = serde_json::from_value(v).expect("rollout line");
-            match rl.item {
-                RolloutItem::SessionMeta(_) => {}
-                other => items.push(other),
-            }
-        }
-        items
-    };
+    // Fork 2: drops the last user message and everything after.
+    // [0] user instructions,
+    // [1] environment context,
+    // [2] "first" user message,
+    let expected_after_second = vec![
+        entries_after_three[0].clone(),
+        entries_after_three[1].clone(),
+        entries_after_three[2].clone(),
+    ];
 
-    // Compute expected prefixes after each fork by truncating base rollout at nth-from-last user input.
-    let base_items = read_items(&base_path);
-    let find_user_input_positions = |items: &[RolloutItem]| -> Vec<usize> {
-        let mut pos = Vec::new();
-        for (i, it) in items.iter().enumerate() {
-            if let RolloutItem::ResponseItem(ResponseItem::Message { role, content, .. }) = it
-                && role == "user"
-            {
-                // Consider any user message as an input boundary; recorder stores both EventMsg and ResponseItem.
-                // We specifically look for input items, which are represented as ContentItem::InputText.
-                if content
-                    .iter()
-                    .any(|c| matches!(c, ContentItem::InputText { .. }))
-                {
-                    pos.push(i);
-                }
-            }
-        }
-        pos
-    };
-    let user_inputs = find_user_input_positions(&base_items);
-
-    // After dropping last user input (n=1), cut strictly before that input if present, else empty.
-    let cut1 = user_inputs
-        .get(user_inputs.len().saturating_sub(1))
-        .copied()
-        .unwrap_or(0);
-    let expected_after_first: Vec<RolloutItem> = base_items[..cut1].to_vec();
-
-    // After dropping again (n=1 on fork1), compute expected relative to fork1's rollout.
-
-    // Fork once with n=1 → drops the last user input and everything after.
+    // Fork once with n=1 → drops the last user message and everything after.
     let NewConversation {
         conversation: codex_fork1,
         ..
     } = conversation_manager
-        .fork_conversation(1, config_for_fork.clone(), base_path.clone())
+        .fork_conversation(entries_after_three.clone(), 1, config_for_fork.clone())
         .await
         .expect("fork 1");
 
-    codex_fork1.submit(Op::GetPath).await.unwrap();
+    codex_fork1.submit(Op::GetHistory).await.unwrap();
     let fork1_history = wait_for_event(&codex_fork1, |ev| {
-        matches!(ev, EventMsg::ConversationPath(_))
+        matches!(ev, EventMsg::ConversationHistory(_))
     })
     .await;
-    let fork1_path = match &fork1_history {
-        EventMsg::ConversationPath(ConversationPathResponseEvent { path, .. }) => path.clone(),
+    let entries_after_first_fork = match &fork1_history {
+        EventMsg::ConversationHistory(ConversationHistoryResponseEvent { entries, .. }) => {
+            assert!(matches!(
+                fork1_history,
+                EventMsg::ConversationHistory(ConversationHistoryResponseEvent { ref entries, .. }) if *entries == expected_after_first
+            ));
+            entries.clone()
+        }
         _ => panic!("expected ConversationHistory event after first fork"),
     };
 
-    // GetHistory on fork1 flushed; the file is ready.
-    let fork1_items = read_items(&fork1_path);
-    pretty_assertions::assert_eq!(
-        serde_json::to_value(&fork1_items).unwrap(),
-        serde_json::to_value(&expected_after_first).unwrap()
-    );
-
     // Fork again with n=1 → drops the (new) last user message, leaving only the first.
     let NewConversation {
         conversation: codex_fork2,
         ..
     } = conversation_manager
-        .fork_conversation(1, config_for_fork.clone(), fork1_path.clone())
+        .fork_conversation(entries_after_first_fork.clone(), 1, config_for_fork.clone())
         .await
         .expect("fork 2");
 
-    codex_fork2.submit(Op::GetPath).await.unwrap();
+    codex_fork2.submit(Op::GetHistory).await.unwrap();
     let fork2_history = wait_for_event(&codex_fork2, |ev| {
-        matches!(ev, EventMsg::ConversationPath(_))
+        matches!(ev, EventMsg::ConversationHistory(_))
     })
     .await;
-    let fork2_path = match &fork2_history {
-        EventMsg::ConversationPath(ConversationPathResponseEvent { path, .. }) => path.clone(),
-        _ => panic!("expected ConversationHistory event after second fork"),
-    };
-    // GetHistory on fork2 flushed; the file is ready.
-    let fork1_items = read_items(&fork1_path);
-    let fork1_user_inputs = find_user_input_positions(&fork1_items);
-    let cut_last_on_fork1 = fork1_user_inputs
-        .get(fork1_user_inputs.len().saturating_sub(1))
-        .copied()
-        .unwrap_or(0);
-    let expected_after_second: Vec<RolloutItem> = fork1_items[..cut_last_on_fork1].to_vec();
-    let fork2_items = read_items(&fork2_path);
-    pretty_assertions::assert_eq!(
-        serde_json::to_value(&fork2_items).unwrap(),
-        serde_json::to_value(&expected_after_second).unwrap()
-    );
+    assert!(matches!(
+        fork2_history,
+        EventMsg::ConversationHistory(ConversationHistoryResponseEvent { ref entries, .. }) if *entries == expected_after_second
+    ));
 }

codex-rs/core/tests/suite/prompt_caching.rs

@@ -191,8 +191,13 @@ async fn prompt_tools_are_consistent_across_requests() {
     let expected_instructions: &str = include_str!("../../prompt.md");
     // our internal implementation is responsible for keeping tools in sync
     // with the OpenAI schema, so we just verify the tool presence here
-    let expected_tools_names: &[&str] =
-        &["unified_exec", "update_plan", "apply_patch", "view_image"];
+    let expected_tools_names: &[&str] = &[
+        "shell",
+        "unified_exec",
+        "update_plan",
+        "apply_patch",
+        "view_image",
+    ];
     let body0 = requests[0].body_json::<serde_json::Value>().unwrap();
     assert_eq!(
         body0["instructions"],
@@ -272,7 +277,7 @@ async fn prefixes_context_and_instructions_once_and_consistently_across_requests
 
     let shell = default_user_shell().await;
 
-    let expected_env_text_init = format!(
+    let expected_env_text = format!(
         r#"<environment_context>
   <cwd>{}</cwd>
   <approval_policy>on-request</approval_policy>
@@ -285,28 +290,13 @@ async fn prefixes_context_and_instructions_once_and_consistently_across_requests
             None => String::new(),
         }
     );
-    // Per-turn environment context omits the shell tag.
-    let expected_env_text_turn = format!(
-        r#"<environment_context>
-  <cwd>{}</cwd>
-  <approval_policy>on-request</approval_policy>
-  <sandbox_mode>read-only</sandbox_mode>
-  <network_access>restricted</network_access>
-</environment_context>"#,
-        cwd.path().to_string_lossy(),
-    );
     let expected_ui_text =
         "<user_instructions>\n\nbe consistent and helpful\n\n</user_instructions>";
 
-    let expected_env_msg_init = serde_json::json!({
+    let expected_env_msg = serde_json::json!({
         "type": "message",
         "role": "user",
-        "content": [ { "type": "input_text", "text": expected_env_text_init } ]
-    });
-    let expected_env_msg_turn = serde_json::json!({
-        "type": "message",
-        "role": "user",
-        "content": [ { "type": "input_text", "text": expected_env_text_turn } ]
+        "content": [ { "type": "input_text", "text": expected_env_text } ]
     });
     let expected_ui_msg = serde_json::json!({
         "type": "message",
@@ -322,12 +312,7 @@ async fn prefixes_context_and_instructions_once_and_consistently_across_requests
     let body1 = requests[0].body_json::<serde_json::Value>().unwrap();
     assert_eq!(
         body1["input"],
-        serde_json::json!([
-            expected_ui_msg,
-            expected_env_msg_init,
-            expected_env_msg_turn,
-            expected_user_message_1
-        ])
+        serde_json::json!([expected_ui_msg, expected_env_msg, expected_user_message_1])
     );
 
     let expected_user_message_2 = serde_json::json!({
@@ -339,7 +324,7 @@ async fn prefixes_context_and_instructions_once_and_consistently_across_requests
     let expected_body2 = serde_json::json!(
         [
             body1["input"].as_array().unwrap().as_slice(),
-            [expected_env_msg_turn, expected_user_message_2].as_slice(),
+            [expected_user_message_2].as_slice(),
         ]
         .concat()
     );
@@ -447,17 +432,11 @@ async fn overrides_turn_context_but_keeps_cached_prefix_and_key_constant() {
     // After overriding the turn context, the environment context should be emitted again
     // reflecting the new approval policy and sandbox settings. Omit cwd because it did
     // not change.
-    let expected_env_text_2 = format!(
-        r#"<environment_context>
+    let expected_env_text_2 = r#"<environment_context>
   <approval_policy>never</approval_policy>
   <sandbox_mode>workspace-write</sandbox_mode>
   <network_access>enabled</network_access>
-  <writable_roots>
-    <root>{}</root>
-  </writable_roots>
-</environment_context>"#,
-        writable.path().to_string_lossy()
-    );
+</environment_context>"#;
     let expected_env_msg_2 = serde_json::json!({
         "type": "message",
         "role": "user",
@@ -567,24 +546,10 @@ async fn per_turn_overrides_keep_cached_prefix_and_key_constant() {
         "role": "user",
         "content": [ { "type": "input_text", "text": "hello 2" } ]
     });
-    let expected_env_text_2 = format!(
-        r#"<environment_context>
-  <cwd>{}</cwd>
-  <approval_policy>never</approval_policy>
-  <sandbox_mode>workspace-write</sandbox_mode>
-  <network_access>enabled</network_access>
-</environment_context>"#,
-        new_cwd.path().to_string_lossy()
-    );
-    let expected_env_msg_2 = serde_json::json!({
-        "type": "message",
-        "role": "user",
-        "content": [ { "type": "input_text", "text": expected_env_text_2 } ]
-    });
     let expected_body2 = serde_json::json!(
         [
             body1["input"].as_array().unwrap().as_slice(),
-            [expected_env_msg_2, expected_user_message_2].as_slice(),
+            [expected_user_message_2].as_slice(),
         ]
         .concat()
     );

codex-rs/core/tests/suite/seatbelt.rs

@@ -159,41 +159,6 @@ async fn read_only_forbids_all_writes() {
         .await;
 }
 
-/// Verify that user lookups via `pwd.getpwuid(os.getuid())` work under the
-/// seatbelt sandbox. Prior to allowing the necessary mach‑lookup for
-/// OpenDirectory libinfo, this would fail with `KeyError: getpwuid(): uid not found`.
-#[tokio::test]
-async fn python_getpwuid_works_under_seatbelt() {
-    if std::env::var(CODEX_SANDBOX_ENV_VAR) == Ok("seatbelt".to_string()) {
-        eprintln!("{CODEX_SANDBOX_ENV_VAR} is set to 'seatbelt', skipping test.");
-        return;
-    }
-
-    // ReadOnly is sufficient here since we are only exercising user lookup.
-    let policy = SandboxPolicy::ReadOnly;
-
-    let mut child = spawn_command_under_seatbelt(
-        vec![
-            "python3".to_string(),
-            "-c".to_string(),
-            // Print the passwd struct; success implies lookup worked.
-            "import pwd, os; print(pwd.getpwuid(os.getuid()))".to_string(),
-        ],
-        &policy,
-        std::env::current_dir().expect("should be able to get current dir"),
-        StdioPolicy::RedirectForShellTool,
-        HashMap::new(),
-    )
-    .await
-    .expect("should be able to spawn python under seatbelt");
-
-    let status = child
-        .wait()
-        .await
-        .expect("should be able to wait for child process");
-    assert!(status.success(), "python exited with {status:?}");
-}
-
 #[expect(clippy::expect_used)]
 fn create_test_scenario(tmp: &TempDir) -> TestScenario {
     let repo_parent = tmp.path().to_path_buf();

codex-rs/exec/Cargo.toml

@@ -25,6 +25,7 @@ codex-common = { path = "../common", features = [
     "sandbox_summary",
 ] }
 codex-core = { path = "../core" }
+codex-login = { path = "../login" }
 codex-ollama = { path = "../ollama" }
 codex-protocol = { path = "../protocol" }
 owo-colors = "4.2.0"

codex-rs/exec/src/event_processor_with_human_output.rs

@@ -26,7 +26,6 @@ use codex_core::protocol::TurnAbortReason;
 use codex_core::protocol::TurnDiffEvent;
 use codex_core::protocol::WebSearchBeginEvent;
 use codex_core::protocol::WebSearchEndEvent;
-use codex_protocol::num_format::format_with_separators;
 use owo_colors::OwoColorize;
 use owo_colors::Style;
 use shlex::try_join;
@@ -190,14 +189,8 @@ impl EventProcessor for EventProcessorWithHumanOutput {
                 }
                 return CodexStatus::InitiateShutdown;
             }
-            EventMsg::TokenCount(ev) => {
-                if let Some(usage_info) = ev.info {
-                    ts_println!(
-                        self,
-                        "tokens used: {}",
-                        format_with_separators(usage_info.total_token_usage.blended_total())
-                    );
-                }
+            EventMsg::TokenCount(token_usage) => {
+                ts_println!(self, "tokens used: {}", token_usage.blended_total());
             }
             EventMsg::AgentMessageDelta(AgentMessageDeltaEvent { delta }) => {
                 if !self.answer_started {
@@ -518,19 +511,18 @@ impl EventProcessor for EventProcessorWithHumanOutput {
             }
             EventMsg::SessionConfigured(session_configured_event) => {
                 let SessionConfiguredEvent {
-                    session_id: conversation_id,
+                    session_id,
                     model,
                     history_log_id: _,
                     history_entry_count: _,
                     initial_messages: _,
-                    rollout_path: _,
                 } = session_configured_event;
 
                 ts_println!(
                     self,
                     "{} {}",
                     "codex session".style(self.magenta).style(self.bold),
-                    conversation_id.to_string().style(self.dimmed)
+                    session_id.to_string().style(self.dimmed)
                 );
 
                 ts_println!(self, "model: {}", model);
@@ -559,7 +551,7 @@ impl EventProcessor for EventProcessorWithHumanOutput {
                 }
             },
             EventMsg::ShutdownComplete => return CodexStatus::Shutdown,
-            EventMsg::ConversationPath(_) => {}
+            EventMsg::ConversationHistory(_) => {}
             EventMsg::UserMessage(_) => {}
         }
         CodexStatus::Running

codex-rs/exec/src/lib.rs

@@ -190,6 +190,7 @@ pub async fn run_main(cli: Cli, codex_linux_sandbox_exe: Option<PathBuf>) -> any
     let conversation_manager = ConversationManager::new(AuthManager::shared(
         config.codex_home.clone(),
         config.preferred_auth_method,
+        config.responses_originator_header.clone(),
     ));
     let NewConversation {
         conversation_id: _,

codex-rs/linux-sandbox/Cargo.toml

@@ -15,7 +15,9 @@ path = "src/lib.rs"
 workspace = true
 
 [target.'cfg(target_os = "linux")'.dependencies]
+anyhow = "1"
 clap = { version = "4", features = ["derive"] }
+codex-common = { path = "../common", features = ["cli"] }
 codex-core = { path = "../core" }
 landlock = "0.4.1"
 libc = "0.2.175"

codex-rs/login/Cargo.toml

@@ -17,6 +17,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 sha2 = "0.10"
 tempfile = "3"
+thiserror = "2.0.16"
 tiny_http = "0.12"
 tokio = { version = "1", features = [
     "io-std",
@@ -30,4 +31,5 @@ urlencoding = "2.1"
 webbrowser = "1.0"
 
 [dev-dependencies]
+pretty_assertions = "1.4.1"
 tempfile = "3"

codex-rs/login/src/server.rs

@@ -16,7 +16,6 @@ use base64::Engine;
 use chrono::Utc;
 use codex_core::auth::AuthDotJson;
 use codex_core::auth::get_auth_file;
-use codex_core::default_client::ORIGINATOR;
 use codex_core::token_data::TokenData;
 use codex_core::token_data::parse_id_token;
 use rand::RngCore;
@@ -36,10 +35,11 @@ pub struct ServerOptions {
     pub port: u16,
     pub open_browser: bool,
     pub force_state: Option<String>,
+    pub originator: String,
 }
 
 impl ServerOptions {
-    pub fn new(codex_home: PathBuf, client_id: String) -> Self {
+    pub fn new(codex_home: PathBuf, client_id: String, originator: String) -> Self {
         Self {
             codex_home,
             client_id: client_id.to_string(),
@@ -47,6 +47,7 @@ impl ServerOptions {
             port: DEFAULT_PORT,
             open_browser: true,
             force_state: None,
+            originator,
         }
     }
 }
@@ -102,7 +103,14 @@ pub fn run_login_server(opts: ServerOptions) -> io::Result<LoginServer> {
     let server = Arc::new(server);
 
     let redirect_uri = format!("http://localhost:{actual_port}/auth/callback");
-    let auth_url = build_authorize_url(&opts.issuer, &opts.client_id, &redirect_uri, &pkce, &state);
+    let auth_url = build_authorize_url(
+        &opts.issuer,
+        &opts.client_id,
+        &redirect_uri,
+        &pkce,
+        &state,
+        &opts.originator,
+    );
 
     if opts.open_browser {
         let _ = webbrowser::open(&auth_url);
@@ -303,6 +311,7 @@ fn build_authorize_url(
     redirect_uri: &str,
     pkce: &PkceCodes,
     state: &str,
+    originator: &str,
 ) -> String {
     let query = vec![
         ("response_type", "code"),
@@ -314,7 +323,7 @@ fn build_authorize_url(
         ("id_token_add_organizations", "true"),
         ("codex_cli_simplified_flow", "true"),
         ("state", state),
-        ("originator", ORIGINATOR.value.as_str()),
+        ("originator", originator),
     ];
     let qs = query
         .into_iter()

codex-rs/login/tests/suite/login_server_e2e.rs

@@ -102,6 +102,7 @@ async fn end_to_end_login_flow_persists_auth_json() {
         port: 0,
         open_browser: false,
         force_state: Some(state),
+        originator: "test_originator".to_string(),
     };
     let server = run_login_server(opts).unwrap();
     let login_port = server.actual_port;
@@ -160,6 +161,7 @@ async fn creates_missing_codex_home_dir() {
         port: 0,
         open_browser: false,
         force_state: Some(state),
+        originator: "test_originator".to_string(),
     };
     let server = run_login_server(opts).unwrap();
     let login_port = server.actual_port;
@@ -200,6 +202,7 @@ async fn cancels_previous_login_server_when_port_is_in_use() {
         port: 0,
         open_browser: false,
         force_state: Some("cancel_state".to_string()),
+        originator: "test_originator".to_string(),
     };
 
     let first_server = run_login_server(first_opts).unwrap();
@@ -218,6 +221,7 @@ async fn cancels_previous_login_server_when_port_is_in_use() {
         port: login_port,
         open_browser: false,
         force_state: Some("cancel_state_2".to_string()),
+        originator: "test_originator".to_string(),
     };
 
     let second_server = run_login_server(second_opts).unwrap();

codex-rs/mcp-client/src/main.rs

@@ -64,9 +64,6 @@ async fn main() -> Result<()> {
             name: "codex-mcp-client".to_owned(),
             version: env!("CARGO_PKG_VERSION").to_owned(),
             title: Some("Codex".to_string()),
-            // This field is used by Codex when it is an MCP server: it should
-            // not be used when Codex is an MCP client.
-            user_agent: None,
         },
         protocol_version: MCP_SCHEMA_VERSION.to_owned(),
     };

codex-rs/mcp-server/Cargo.toml

@@ -26,6 +26,7 @@ schemars = "0.8.22"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 shlex = "1.3.0"
+strum_macros = "0.27.2"
 tokio = { version = "1", features = [
     "io-std",
     "macros",
@@ -40,9 +41,8 @@ uuid = { version = "1", features = ["serde", "v4"] }
 
 [dev-dependencies]
 assert_cmd = "2"
-base64 = "0.22"
 mcp_test_support = { path = "tests/common" }
-os_info = "3.12.0"
 pretty_assertions = "1.4.1"
 tempfile = "3"
+tokio-test = "0.4"
 wiremock = "0.6"

codex-rs/mcp-server/src/codex_message_processor.rs

@@ -1,3 +1,8 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::sync::Arc;
+use std::time::Duration;
+
 use crate::error_code::INTERNAL_ERROR_CODE;
 use crate::error_code::INVALID_REQUEST_ERROR_CODE;
 use crate::json_to_toml::json_to_toml;
@@ -9,15 +14,11 @@ use codex_core::ConversationManager;
 use codex_core::Cursor as RolloutCursor;
 use codex_core::NewConversation;
 use codex_core::RolloutRecorder;
-use codex_core::SessionMeta;
 use codex_core::auth::CLIENT_ID;
-use codex_core::auth::get_auth_file;
-use codex_core::auth::try_read_auth_json;
 use codex_core::config::Config;
 use codex_core::config::ConfigOverrides;
 use codex_core::config::ConfigToml;
 use codex_core::config::load_config_as_toml;
-use codex_core::default_client::get_codex_user_agent;
 use codex_core::exec::ExecParams;
 use codex_core::exec_env::create_env;
 use codex_core::get_platform_sandbox;
@@ -37,8 +38,6 @@ use codex_protocol::mcp_protocol::AddConversationListenerParams;
 use codex_protocol::mcp_protocol::AddConversationSubscriptionResponse;
 use codex_protocol::mcp_protocol::ApplyPatchApprovalParams;
 use codex_protocol::mcp_protocol::ApplyPatchApprovalResponse;
-use codex_protocol::mcp_protocol::ArchiveConversationParams;
-use codex_protocol::mcp_protocol::ArchiveConversationResponse;
 use codex_protocol::mcp_protocol::AuthMode;
 use codex_protocol::mcp_protocol::AuthStatusChangeNotification;
 use codex_protocol::mcp_protocol::ClientRequest;
@@ -49,7 +48,6 @@ use codex_protocol::mcp_protocol::ExecArbitraryCommandResponse;
 use codex_protocol::mcp_protocol::ExecCommandApprovalParams;
 use codex_protocol::mcp_protocol::ExecCommandApprovalResponse;
 use codex_protocol::mcp_protocol::ExecOneOffCommandParams;
-use codex_protocol::mcp_protocol::GetUserAgentResponse;
 use codex_protocol::mcp_protocol::GetUserSavedConfigResponse;
 use codex_protocol::mcp_protocol::GitDiffToRemoteResponse;
 use codex_protocol::mcp_protocol::InputItem as WireInputItem;
@@ -69,25 +67,12 @@ use codex_protocol::mcp_protocol::SendUserMessageResponse;
 use codex_protocol::mcp_protocol::SendUserTurnParams;
 use codex_protocol::mcp_protocol::SendUserTurnResponse;
 use codex_protocol::mcp_protocol::ServerNotification;
-use codex_protocol::mcp_protocol::UserInfoResponse;
 use codex_protocol::mcp_protocol::UserSavedConfig;
-use codex_protocol::models::ContentItem;
-use codex_protocol::models::ResponseItem;
-use codex_protocol::protocol::InputMessageKind;
-use codex_protocol::protocol::USER_MESSAGE_BEGIN;
 use mcp_types::JSONRPCErrorError;
 use mcp_types::RequestId;
-use std::collections::HashMap;
-use std::ffi::OsStr;
-use std::path::PathBuf;
-use std::sync::Arc;
-use std::time::Duration;
-use tokio::select;
 use tokio::sync::Mutex;
 use tokio::sync::oneshot;
 use tracing::error;
-use tracing::info;
-use tracing::warn;
 use uuid::Uuid;
 
 // Duration before a ChatGPT login attempt is abandoned.
@@ -114,7 +99,7 @@ pub(crate) struct CodexMessageProcessor {
     conversation_listeners: HashMap<Uuid, oneshot::Sender<()>>,
     active_login: Arc<Mutex<Option<ActiveLogin>>>,
     // Queue of pending interrupt requests per conversation. We reply when TurnAborted arrives.
-    pending_interrupts: Arc<Mutex<HashMap<ConversationId, Vec<RequestId>>>>,
+    pending_interrupts: Arc<Mutex<HashMap<Uuid, Vec<RequestId>>>>,
 }
 
 impl CodexMessageProcessor {
@@ -151,9 +136,6 @@ impl CodexMessageProcessor {
             ClientRequest::ResumeConversation { request_id, params } => {
                 self.handle_resume_conversation(request_id, params).await;
             }
-            ClientRequest::ArchiveConversation { request_id, params } => {
-                self.archive_conversation(request_id, params).await;
-            }
             ClientRequest::SendUserMessage { request_id, params } => {
                 self.send_user_message(request_id, params).await;
             }
@@ -187,12 +169,6 @@ impl CodexMessageProcessor {
             ClientRequest::GetUserSavedConfig { request_id } => {
                 self.get_user_saved_config(request_id).await;
             }
-            ClientRequest::GetUserAgent { request_id } => {
-                self.get_user_agent(request_id).await;
-            }
-            ClientRequest::UserInfo { request_id } => {
-                self.get_user_info(request_id).await;
-            }
             ClientRequest::ExecOneOffCommand { request_id, params } => {
                 self.exec_one_off_command(request_id, params).await;
             }
@@ -204,7 +180,11 @@ impl CodexMessageProcessor {
 
         let opts = LoginServerOptions {
             open_browser: false,
-            ..LoginServerOptions::new(config.codex_home.clone(), CLIENT_ID.to_string())
+            ..LoginServerOptions::new(
+                config.codex_home.clone(),
+                CLIENT_ID.to_string(),
+                config.responses_originator_header.clone(),
+            )
         };
 
         enum LoginChatGptReply {
@@ -404,12 +384,6 @@ impl CodexMessageProcessor {
         self.outgoing.send_response(request_id, response).await;
     }
 
-    async fn get_user_agent(&self, request_id: RequestId) {
-        let user_agent = get_codex_user_agent();
-        let response = GetUserAgentResponse { user_agent };
-        self.outgoing.send_response(request_id, response).await;
-    }
-
     async fn get_user_saved_config(&self, request_id: RequestId) {
         let toml_value = match load_config_as_toml(&self.config.codex_home) {
             Ok(val) => val,
@@ -445,18 +419,6 @@ impl CodexMessageProcessor {
         self.outgoing.send_response(request_id, response).await;
     }
 
-    async fn get_user_info(&self, request_id: RequestId) {
-        // Read alleged user email from auth.json (best-effort; not verified).
-        let auth_path = get_auth_file(&self.config.codex_home);
-        let alleged_user_email = match try_read_auth_json(&auth_path) {
-            Ok(auth) => auth.tokens.and_then(|t| t.id_token.email),
-            Err(_) => None,
-        };
-
-        let response = UserInfoResponse { alleged_user_email };
-        self.outgoing.send_response(request_id, response).await;
-    }
-
     async fn exec_one_off_command(&self, request_id: RequestId, params: ExecOneOffCommandParams) {
         tracing::debug!("ExecOneOffCommand params: {params:?}");
 
@@ -549,9 +511,8 @@ impl CodexMessageProcessor {
                     ..
                 } = conversation_id;
                 let response = NewConversationResponse {
-                    conversation_id,
+                    conversation_id: ConversationId(conversation_id),
                     model: session_configured.model,
-                    rollout_path: session_configured.rollout_path,
                 };
                 self.outgoing.send_response(request_id, response).await;
             }
@@ -598,11 +559,16 @@ impl CodexMessageProcessor {
             }
         };
 
-        let items = page
-            .items
-            .into_iter()
-            .filter_map(|it| extract_conversation_summary(it.path, &it.head))
-            .collect();
+        // Build summaries
+        let mut items: Vec<ConversationSummary> = Vec::new();
+        for it in page.items.into_iter() {
+            let (timestamp, preview) = extract_ts_and_preview(&it.head);
+            items.push(ConversationSummary {
+                path: it.path,
+                preview,
+                timestamp,
+            });
+        }
 
         // Encode next_cursor as a plain string
         let next_cursor = match page.next_cursor {
@@ -656,29 +622,19 @@ impl CodexMessageProcessor {
                 session_configured,
                 ..
             }) => {
-                let event = Event {
+                let event = codex_core::protocol::Event {
                     id: "".to_string(),
-                    msg: EventMsg::SessionConfigured(session_configured.clone()),
+                    msg: codex_core::protocol::EventMsg::SessionConfigured(
+                        session_configured.clone(),
+                    ),
                 };
                 self.outgoing.send_event_as_notification(&event, None).await;
-                let initial_messages = session_configured.initial_messages.map(|msgs| {
-                    msgs.into_iter()
-                        .filter(|event| {
-                            // Don't send non-plain user messages (like user instructions
-                            // or environment context) back so they don't get rendered.
-                            if let EventMsg::UserMessage(user_message) = event {
-                                return matches!(user_message.kind, Some(InputMessageKind::Plain));
-                            }
-                            true
-                        })
-                        .collect()
-                });
 
                 // Reply with conversation id + model and initial messages (when present)
                 let response = codex_protocol::mcp_protocol::ResumeConversationResponse {
-                    conversation_id,
+                    conversation_id: ConversationId(conversation_id),
                     model: session_configured.model.clone(),
-                    initial_messages,
+                    initial_messages: session_configured.initial_messages.clone(),
                 };
                 self.outgoing.send_response(request_id, response).await;
             }
@@ -693,141 +649,6 @@ impl CodexMessageProcessor {
         }
     }
 
-    async fn archive_conversation(&self, request_id: RequestId, params: ArchiveConversationParams) {
-        let ArchiveConversationParams {
-            conversation_id,
-            rollout_path,
-        } = params;
-
-        // Verify that the rollout path is in the sessions directory or else
-        // a malicious client could specify an arbitrary path.
-        let rollout_folder = self.config.codex_home.join(codex_core::SESSIONS_SUBDIR);
-        let canonical_rollout_path = tokio::fs::canonicalize(&rollout_path).await;
-        let canonical_rollout_path = if let Ok(path) = canonical_rollout_path
-            && path.starts_with(&rollout_folder)
-        {
-            path
-        } else {
-            let error = JSONRPCErrorError {
-                code: INVALID_REQUEST_ERROR_CODE,
-                message: format!(
-                    "rollout path `{}` must be in sessions directory",
-                    rollout_path.display()
-                ),
-                data: None,
-            };
-            self.outgoing.send_error(request_id, error).await;
-            return;
-        };
-
-        let required_suffix = format!("{}.jsonl", conversation_id.0);
-        let Some(file_name) = canonical_rollout_path.file_name().map(OsStr::to_owned) else {
-            let error = JSONRPCErrorError {
-                code: INVALID_REQUEST_ERROR_CODE,
-                message: format!(
-                    "rollout path `{}` missing file name",
-                    rollout_path.display()
-                ),
-                data: None,
-            };
-            self.outgoing.send_error(request_id, error).await;
-            return;
-        };
-
-        if !file_name
-            .to_string_lossy()
-            .ends_with(required_suffix.as_str())
-        {
-            let error = JSONRPCErrorError {
-                code: INVALID_REQUEST_ERROR_CODE,
-                message: format!(
-                    "rollout path `{}` does not match conversation id {conversation_id}",
-                    rollout_path.display()
-                ),
-                data: None,
-            };
-            self.outgoing.send_error(request_id, error).await;
-            return;
-        }
-
-        let removed_conversation = self
-            .conversation_manager
-            .remove_conversation(&conversation_id)
-            .await;
-        if let Some(conversation) = removed_conversation {
-            info!("conversation {conversation_id} was active; shutting down");
-            let conversation_clone = conversation.clone();
-            let notify = Arc::new(tokio::sync::Notify::new());
-            let notify_clone = notify.clone();
-
-            // Establish the listener for ShutdownComplete before submitting
-            // Shutdown so it is not missed.
-            let is_shutdown = tokio::spawn(async move {
-                loop {
-                    select! {
-                        _ = notify_clone.notified() => {
-                            break;
-                        }
-                        event = conversation_clone.next_event() => {
-                            if let Ok(event) = event && matches!(event.msg, EventMsg::ShutdownComplete) {
-                                break;
-                            }
-                        }
-                    }
-                }
-            });
-
-            // Request shutdown.
-            match conversation.submit(Op::Shutdown).await {
-                Ok(_) => {
-                    // Successfully submitted Shutdown; wait before proceeding.
-                    select! {
-                        _ = is_shutdown => {
-                            // Normal shutdown: proceed with archive.
-                        }
-                        _ = tokio::time::sleep(Duration::from_secs(10)) => {
-                            warn!("conversation {conversation_id} shutdown timed out; proceeding with archive");
-                            notify.notify_one();
-                        }
-                    }
-                }
-                Err(err) => {
-                    error!("failed to submit Shutdown to conversation {conversation_id}: {err}");
-                    notify.notify_one();
-                    // Perhaps we lost a shutdown race, so let's continue to
-                    // clean up the .jsonl file.
-                }
-            }
-        }
-
-        // Move the .jsonl file to the archived sessions subdir.
-        let result: std::io::Result<()> = async {
-            let archive_folder = self
-                .config
-                .codex_home
-                .join(codex_core::ARCHIVED_SESSIONS_SUBDIR);
-            tokio::fs::create_dir_all(&archive_folder).await?;
-            tokio::fs::rename(&canonical_rollout_path, &archive_folder.join(&file_name)).await?;
-            Ok(())
-        }
-        .await;
-
-        match result {
-            Ok(()) => {
-                let response = ArchiveConversationResponse {};
-                self.outgoing.send_response(request_id, response).await;
-            }
-            Err(err) => {
-                let error = JSONRPCErrorError {
-                    code: INTERNAL_ERROR_CODE,
-                    message: format!("failed to archive conversation: {err}"),
-                    data: None,
-                };
-                self.outgoing.send_error(request_id, error).await;
-            }
-        }
-    }
-
     async fn send_user_message(&self, request_id: RequestId, params: SendUserMessageParams) {
         let SendUserMessageParams {
             conversation_id,
@@ -835,7 +656,7 @@ impl CodexMessageProcessor {
         } = params;
         let Ok(conversation) = self
             .conversation_manager
-            .get_conversation(conversation_id)
+            .get_conversation(conversation_id.0)
             .await
         else {
             let error = JSONRPCErrorError {
@@ -883,7 +704,7 @@ impl CodexMessageProcessor {
 
         let Ok(conversation) = self
             .conversation_manager
-            .get_conversation(conversation_id)
+            .get_conversation(conversation_id.0)
             .await
         else {
             let error = JSONRPCErrorError {
@@ -929,7 +750,7 @@ impl CodexMessageProcessor {
         let InterruptConversationParams { conversation_id } = params;
         let Ok(conversation) = self
             .conversation_manager
-            .get_conversation(conversation_id)
+            .get_conversation(conversation_id.0)
             .await
         else {
             let error = JSONRPCErrorError {
@@ -944,7 +765,7 @@ impl CodexMessageProcessor {
         // Record the pending interrupt so we can reply when TurnAborted arrives.
         {
             let mut map = self.pending_interrupts.lock().await;
-            map.entry(conversation_id).or_default().push(request_id);
+            map.entry(conversation_id.0).or_default().push(request_id);
         }
 
         // Submit the interrupt; we'll respond upon TurnAborted.
@@ -959,12 +780,12 @@ impl CodexMessageProcessor {
         let AddConversationListenerParams { conversation_id } = params;
         let Ok(conversation) = self
             .conversation_manager
-            .get_conversation(conversation_id)
+            .get_conversation(conversation_id.0)
             .await
         else {
             let error = JSONRPCErrorError {
                 code: INVALID_REQUEST_ERROR_CODE,
-                message: format!("conversation not found: {conversation_id}"),
+                message: format!("conversation not found: {}", conversation_id.0),
                 data: None,
             };
             self.outgoing.send_error(request_id, error).await;
@@ -1001,11 +822,11 @@ impl CodexMessageProcessor {
                         let mut params = match serde_json::to_value(event.clone()) {
                             Ok(serde_json::Value::Object(map)) => map,
                             Ok(_) => {
-                                error!("event did not serialize to an object");
+                                tracing::error!("event did not serialize to an object");
                                 continue;
                             }
                             Err(err) => {
-                                error!("failed to serialize event: {err}");
+                                tracing::error!("failed to serialize event: {err}");
                                 continue;
                             }
                         };
@@ -1077,7 +898,7 @@ async fn apply_bespoke_event_handling(
     conversation_id: ConversationId,
     conversation: Arc<CodexConversation>,
     outgoing: Arc<OutgoingMessageSender>,
-    pending_interrupts: Arc<Mutex<HashMap<ConversationId, Vec<RequestId>>>>,
+    pending_interrupts: Arc<Mutex<HashMap<Uuid, Vec<RequestId>>>>,
 ) {
     let Event { id: event_id, msg } = event;
     match msg {
@@ -1130,7 +951,7 @@ async fn apply_bespoke_event_handling(
         EventMsg::TurnAborted(turn_aborted_event) => {
             let pending = {
                 let mut map = pending_interrupts.lock().await;
-                map.remove(&conversation_id).unwrap_or_default()
+                map.remove(&conversation_id.0).unwrap_or_default()
             };
             if !pending.is_empty() {
                 let response = InterruptConversationResponse {
@@ -1188,7 +1009,7 @@ fn derive_config_from_params(
 
 async fn on_patch_approval_response(
     event_id: String,
-    receiver: oneshot::Receiver<mcp_types::Result>,
+    receiver: tokio::sync::oneshot::Receiver<mcp_types::Result>,
     codex: Arc<CodexConversation>,
 ) {
     let response = receiver.await;
@@ -1230,14 +1051,14 @@ async fn on_patch_approval_response(
 
 async fn on_exec_approval_response(
     event_id: String,
-    receiver: oneshot::Receiver<mcp_types::Result>,
+    receiver: tokio::sync::oneshot::Receiver<mcp_types::Result>,
     conversation: Arc<CodexConversation>,
 ) {
     let response = receiver.await;
     let value = match response {
         Ok(value) => value,
         Err(err) => {
-            error!("request failed: {err:?}");
+            tracing::error!("request failed: {err:?}");
             return;
         }
     };
@@ -1264,100 +1085,37 @@ async fn on_exec_approval_response(
     }
 }
 
-fn extract_conversation_summary(
-    path: PathBuf,
-    head: &[serde_json::Value],
-) -> Option<ConversationSummary> {
-    let session_meta = match head.first() {
-        Some(first_line) => serde_json::from_value::<SessionMeta>(first_line.clone()).ok()?,
-        None => return None,
-    };
+fn extract_ts_and_preview(head: &[serde_json::Value]) -> (Option<String>, String) {
+    let ts = head
+        .first()
+        .and_then(|v| v.get("timestamp"))
+        .and_then(|v| v.as_str())
+        .map(|s| s.to_string());
+    let preview = find_first_user_text(head).unwrap_or_default();
+    (ts, preview)
+}
 
-    let preview = head
-        .iter()
-        .filter_map(|value| serde_json::from_value::<ResponseItem>(value.clone()).ok())
-        .find_map(|item| match item {
-            ResponseItem::Message { content, .. } => {
-                content.into_iter().find_map(|content| match content {
-                    ContentItem::InputText { text } => {
-                        match InputMessageKind::from(("user", &text)) {
-                            InputMessageKind::Plain => Some(text),
-                            _ => None,
-                        }
-                    }
-                    _ => None,
-                })
+fn find_first_user_text(head: &[serde_json::Value]) -> Option<String> {
+    use codex_core::protocol::InputMessageKind;
+    for v in head.iter() {
+        let t = v.get("type").and_then(|x| x.as_str()).unwrap_or("");
+        if t != "message" {
+            continue;
+        }
+        if v.get("role").and_then(|x| x.as_str()) != Some("user") {
+            continue;
+        }
+        if let Some(arr) = v.get("content").and_then(|c| c.as_array()) {
+            for c in arr.iter() {
+                if let (Some("input_text"), Some(txt)) =
+                    (c.get("type").and_then(|t| t.as_str()), c.get("text"))
+                    && let Some(s) = txt.as_str()
+                    && matches!(InputMessageKind::from(("user", s)), InputMessageKind::Plain)
+                {
+                    return Some(s.to_string());
+                }
             }
-            _ => None,
-        })?;
-
-    let preview = match preview.find(USER_MESSAGE_BEGIN) {
-        Some(idx) => preview[idx + USER_MESSAGE_BEGIN.len()..].trim(),
-        None => preview.as_str(),
-    };
-
-    let timestamp = if session_meta.timestamp.is_empty() {
-        None
-    } else {
-        Some(session_meta.timestamp.clone())
-    };
-
-    Some(ConversationSummary {
-        conversation_id: session_meta.id,
-        timestamp,
-        path,
-        preview: preview.to_string(),
-    })
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use pretty_assertions::assert_eq;
-    use serde_json::json;
-
-    #[test]
-    fn extract_conversation_summary_prefers_plain_user_messages() {
-        let conversation_id =
-            ConversationId(Uuid::parse_str("3f941c35-29b3-493b-b0a4-e25800d9aeb0").unwrap());
-        let timestamp = Some("2025-09-05T16:53:11.850Z".to_string());
-        let path = PathBuf::from("rollout.jsonl");
-
-        let head = vec![
-            json!({
-                "id": conversation_id.0,
-                "timestamp": timestamp,
-                "cwd": "/",
-                "originator": "codex",
-                "cli_version": "0.0.0",
-                "instructions": null
-            }),
-            json!({
-                "type": "message",
-                "role": "user",
-                "content": [{
-                    "type": "input_text",
-                    "text": "<user_instructions>\n<AGENTS.md contents>\n</user_instructions>".to_string(),
-                }],
-            }),
-            json!({
-                "type": "message",
-                "role": "user",
-                "content": [{
-                    "type": "input_text",
-                    "text": format!("<prior context> {USER_MESSAGE_BEGIN}Count to 5"),
-                }],
-            }),
-        ];
-
-        let summary = extract_conversation_summary(path.clone(), &head).expect("summary");
-
-        assert_eq!(summary.conversation_id, conversation_id);
-        assert_eq!(
-            summary.timestamp,
-            Some("2025-09-05T16:53:11.850Z".to_string())
-        );
-        assert_eq!(summary.path, path);
-        assert_eq!(summary.preview, "Count to 5");
+        }
     }
+    None
 }

codex-rs/mcp-server/src/codex_tool_config.rs

@@ -181,8 +181,8 @@ impl CodexToolCallParam {
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
 #[serde(rename_all = "camelCase")]
 pub struct CodexToolCallReplyParam {
-    /// The conversation id for this Codex session.
-    pub conversation_id: String,
+    /// The *session id* for this conversation.
+    pub session_id: String,
 
     /// The *next user prompt* to continue the Codex conversation.
     pub prompt: String,
@@ -213,8 +213,7 @@ pub(crate) fn create_tool_for_codex_tool_call_reply_param() -> Tool {
         input_schema: tool_input_schema,
         output_schema: None,
         description: Some(
-            "Continue a Codex conversation by providing the conversation id and prompt."
-                .to_string(),
+            "Continue a Codex session by providing the session id and prompt.".to_string(),
         ),
         annotations: None,
     }
@@ -309,21 +308,21 @@ mod tests {
         let tool = create_tool_for_codex_tool_call_reply_param();
         let tool_json = serde_json::to_value(&tool).expect("tool serializes");
         let expected_tool_json = serde_json::json!({
-          "description": "Continue a Codex conversation by providing the conversation id and prompt.",
+          "description": "Continue a Codex session by providing the session id and prompt.",
           "inputSchema": {
             "properties": {
-              "conversationId": {
-                "description": "The conversation id for this Codex session.",
-                "type": "string"
-              },
               "prompt": {
                 "description": "The *next user prompt* to continue the Codex conversation.",
                 "type": "string"
               },
+              "sessionId": {
+                "description": "The *session id* for this conversation.",
+                "type": "string"
+              },
             },
             "required": [
-              "conversationId",
               "prompt",
+              "sessionId",
             ],
             "type": "object",
           },

codex-rs/mcp-server/src/codex_tool_runner.rs

@@ -5,10 +5,6 @@
 use std::collections::HashMap;
 use std::sync::Arc;
 
-use crate::exec_approval::handle_exec_approval_request;
-use crate::outgoing_message::OutgoingMessageSender;
-use crate::outgoing_message::OutgoingNotificationMeta;
-use crate::patch_approval::handle_patch_approval_request;
 use codex_core::CodexConversation;
 use codex_core::ConversationManager;
 use codex_core::NewConversation;
@@ -22,13 +18,18 @@ use codex_core::protocol::InputItem;
 use codex_core::protocol::Op;
 use codex_core::protocol::Submission;
 use codex_core::protocol::TaskCompleteEvent;
-use codex_protocol::mcp_protocol::ConversationId;
 use mcp_types::CallToolResult;
 use mcp_types::ContentBlock;
 use mcp_types::RequestId;
 use mcp_types::TextContent;
 use serde_json::json;
 use tokio::sync::Mutex;
+use uuid::Uuid;
+
+use crate::exec_approval::handle_exec_approval_request;
+use crate::outgoing_message::OutgoingMessageSender;
+use crate::outgoing_message::OutgoingNotificationMeta;
+use crate::patch_approval::handle_patch_approval_request;
 
 pub(crate) const INVALID_PARAMS_ERROR_CODE: i64 = -32602;
 
@@ -42,7 +43,7 @@ pub async fn run_codex_tool_session(
     config: CodexConfig,
     outgoing: Arc<OutgoingMessageSender>,
     conversation_manager: Arc<ConversationManager>,
-    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, ConversationId>>>,
+    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, Uuid>>>,
 ) {
     let NewConversation {
         conversation_id,
@@ -118,13 +119,13 @@ pub async fn run_codex_tool_session_reply(
     outgoing: Arc<OutgoingMessageSender>,
     request_id: RequestId,
     prompt: String,
-    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, ConversationId>>>,
-    conversation_id: ConversationId,
+    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, Uuid>>>,
+    session_id: Uuid,
 ) {
     running_requests_id_to_codex_uuid
         .lock()
         .await
-        .insert(request_id.clone(), conversation_id);
+        .insert(request_id.clone(), session_id);
     if let Err(e) = conversation
         .submit(Op::UserInput {
             items: vec![InputItem::Text { text: prompt }],
@@ -153,7 +154,7 @@ async fn run_codex_tool_session_inner(
     codex: Arc<CodexConversation>,
     outgoing: Arc<OutgoingMessageSender>,
     request_id: RequestId,
-    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, ConversationId>>>,
+    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, Uuid>>>,
 ) {
     let request_id_str = match &request_id {
         RequestId::String(s) => s.clone(),
@@ -277,7 +278,7 @@ async fn run_codex_tool_session_inner(
                     | EventMsg::GetHistoryEntryResponse(_)
                     | EventMsg::PlanUpdate(_)
                     | EventMsg::TurnAborted(_)
-                    | EventMsg::ConversationPath(_)
+                    | EventMsg::ConversationHistory(_)
                     | EventMsg::UserMessage(_)
                     | EventMsg::ShutdownComplete => {
                         // For now, we do not do anything extra for these

codex-rs/mcp-server/src/message_processor.rs

@@ -9,13 +9,10 @@ use crate::codex_tool_config::create_tool_for_codex_tool_call_reply_param;
 use crate::error_code::INVALID_REQUEST_ERROR_CODE;
 use crate::outgoing_message::OutgoingMessageSender;
 use codex_protocol::mcp_protocol::ClientRequest;
-use codex_protocol::mcp_protocol::ConversationId;
 
 use codex_core::AuthManager;
 use codex_core::ConversationManager;
 use codex_core::config::Config;
-use codex_core::default_client::USER_AGENT_SUFFIX;
-use codex_core::default_client::get_codex_user_agent;
 use codex_core::protocol::Submission;
 use mcp_types::CallToolRequestParams;
 use mcp_types::CallToolResult;
@@ -44,7 +41,7 @@ pub(crate) struct MessageProcessor {
     initialized: bool,
     codex_linux_sandbox_exe: Option<PathBuf>,
     conversation_manager: Arc<ConversationManager>,
-    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, ConversationId>>>,
+    running_requests_id_to_codex_uuid: Arc<Mutex<HashMap<RequestId, Uuid>>>,
 }
 
 impl MessageProcessor {
@@ -56,8 +53,11 @@ impl MessageProcessor {
         config: Arc<Config>,
     ) -> Self {
         let outgoing = Arc::new(outgoing);
-        let auth_manager =
-            AuthManager::shared(config.codex_home.clone(), config.preferred_auth_method);
+        let auth_manager = AuthManager::shared(
+            config.codex_home.clone(),
+            config.preferred_auth_method,
+            config.responses_originator_header.clone(),
+        );
         let conversation_manager = Arc::new(ConversationManager::new(auth_manager.clone()));
         let codex_message_processor = CodexMessageProcessor::new(
             auth_manager,
@@ -210,14 +210,6 @@ impl MessageProcessor {
             return;
         }
 
-        let client_info = params.client_info;
-        let name = client_info.name;
-        let version = client_info.version;
-        let user_agent_suffix = format!("{name}; {version}");
-        if let Ok(mut suffix) = USER_AGENT_SUFFIX.lock() {
-            *suffix = Some(user_agent_suffix);
-        }
-
         self.initialized = true;
 
         // Build a minimal InitializeResult. Fill with placeholders.
@@ -238,7 +230,6 @@ impl MessageProcessor {
                 name: "codex-mcp-server".to_string(),
                 version: env!("CARGO_PKG_VERSION").to_string(),
                 title: Some("Codex".to_string()),
-                user_agent: Some(get_codex_user_agent()),
             },
         };
 
@@ -445,10 +436,7 @@ impl MessageProcessor {
         tracing::info!("tools/call -> params: {:?}", arguments);
 
         // parse arguments
-        let CodexToolCallReplyParam {
-            conversation_id,
-            prompt,
-        } = match arguments {
+        let CodexToolCallReplyParam { session_id, prompt } = match arguments {
             Some(json_val) => match serde_json::from_value::<CodexToolCallReplyParam>(json_val) {
                 Ok(params) => params,
                 Err(e) => {
@@ -469,12 +457,12 @@ impl MessageProcessor {
             },
             None => {
                 tracing::error!(
-                    "Missing arguments for codex-reply tool-call; the `conversation_id` and `prompt` fields are required."
+                    "Missing arguments for codex-reply tool-call; the `session_id` and `prompt` fields are required."
                 );
                 let result = CallToolResult {
                     content: vec![ContentBlock::TextContent(TextContent {
                         r#type: "text".to_owned(),
-                        text: "Missing arguments for codex-reply tool-call; the `conversation_id` and `prompt` fields are required.".to_owned(),
+                        text: "Missing arguments for codex-reply tool-call; the `session_id` and `prompt` fields are required.".to_owned(),
                         annotations: None,
                     })],
                     is_error: Some(true),
@@ -485,14 +473,14 @@ impl MessageProcessor {
                 return;
             }
         };
-        let conversation_id = match Uuid::parse_str(&conversation_id) {
-            Ok(id) => ConversationId::from(id),
+        let session_id = match Uuid::parse_str(&session_id) {
+            Ok(id) => id,
             Err(e) => {
-                tracing::error!("Failed to parse conversation_id: {e}");
+                tracing::error!("Failed to parse session_id: {e}");
                 let result = CallToolResult {
                     content: vec![ContentBlock::TextContent(TextContent {
                         r#type: "text".to_owned(),
-                        text: format!("Failed to parse conversation_id: {e}"),
+                        text: format!("Failed to parse session_id: {e}"),
                         annotations: None,
                     })],
                     is_error: Some(true),
@@ -508,18 +496,14 @@ impl MessageProcessor {
         let outgoing = self.outgoing.clone();
         let running_requests_id_to_codex_uuid = self.running_requests_id_to_codex_uuid.clone();
 
-        let codex = match self
-            .conversation_manager
-            .get_conversation(conversation_id)
-            .await
-        {
+        let codex = match self.conversation_manager.get_conversation(session_id).await {
             Ok(c) => c,
             Err(_) => {
-                tracing::warn!("Session not found for conversation_id: {conversation_id}");
+                tracing::warn!("Session not found for session_id: {session_id}");
                 let result = CallToolResult {
                     content: vec![ContentBlock::TextContent(TextContent {
                         r#type: "text".to_owned(),
-                        text: format!("Session not found for conversation_id: {conversation_id}"),
+                        text: format!("Session not found for session_id: {session_id}"),
                         annotations: None,
                     })],
                     is_error: Some(true),
@@ -544,7 +528,7 @@ impl MessageProcessor {
                     request_id,
                     prompt,
                     running_requests_id_to_codex_uuid,
-                    conversation_id,
+                    session_id,
                 )
                 .await;
             }
@@ -580,28 +564,24 @@ impl MessageProcessor {
             RequestId::Integer(i) => i.to_string(),
         };
 
-        // Obtain the conversation id while holding the first lock, then release.
-        let conversation_id = {
+        // Obtain the session_id while holding the first lock, then release.
+        let session_id = {
             let map_guard = self.running_requests_id_to_codex_uuid.lock().await;
             match map_guard.get(&request_id) {
-                Some(id) => *id,
+                Some(id) => *id, // Uuid is Copy
                 None => {
                     tracing::warn!("Session not found for request_id: {}", request_id_string);
                     return;
                 }
             }
         };
-        tracing::info!("conversation_id: {conversation_id}");
+        tracing::info!("session_id: {session_id}");
 
         // Obtain the Codex conversation from the server.
-        let codex_arc = match self
-            .conversation_manager
-            .get_conversation(conversation_id)
-            .await
-        {
+        let codex_arc = match self.conversation_manager.get_conversation(session_id).await {
             Ok(c) => c,
             Err(_) => {
-                tracing::warn!("Session not found for conversation_id: {conversation_id}");
+                tracing::warn!("Session not found for session_id: {session_id}");
                 return;
             }
         };

codex-rs/mcp-server/src/outgoing_message.rs

@@ -258,11 +258,9 @@ pub(crate) struct OutgoingError {
 mod tests {
     use codex_core::protocol::EventMsg;
     use codex_core::protocol::SessionConfiguredEvent;
-    use codex_protocol::mcp_protocol::ConversationId;
     use codex_protocol::mcp_protocol::LoginChatGptCompleteNotification;
     use pretty_assertions::assert_eq;
     use serde_json::json;
-    use tempfile::NamedTempFile;
     use uuid::Uuid;
 
     use super::*;
@@ -272,17 +270,14 @@ mod tests {
         let (outgoing_tx, mut outgoing_rx) = mpsc::unbounded_channel::<OutgoingMessage>();
         let outgoing_message_sender = OutgoingMessageSender::new(outgoing_tx);
 
-        let conversation_id = ConversationId::new();
-        let rollout_file = NamedTempFile::new().unwrap();
         let event = Event {
             id: "1".to_string(),
             msg: EventMsg::SessionConfigured(SessionConfiguredEvent {
-                session_id: conversation_id,
+                session_id: Uuid::new_v4(),
                 model: "gpt-4o".to_string(),
                 history_log_id: 1,
                 history_entry_count: 1000,
                 initial_messages: None,
-                rollout_path: rollout_file.path().to_path_buf(),
             }),
         };
 
@@ -307,15 +302,12 @@ mod tests {
         let (outgoing_tx, mut outgoing_rx) = mpsc::unbounded_channel::<OutgoingMessage>();
         let outgoing_message_sender = OutgoingMessageSender::new(outgoing_tx);
 
-        let conversation_id = ConversationId::new();
-        let rollout_file = NamedTempFile::new().unwrap();
         let session_configured_event = SessionConfiguredEvent {
-            session_id: conversation_id,
+            session_id: Uuid::new_v4(),
             model: "gpt-4o".to_string(),
             history_log_id: 1,
             history_entry_count: 1000,
             initial_messages: None,
-            rollout_path: rollout_file.path().to_path_buf(),
         };
         let event = Event {
             id: "1".to_string(),
@@ -345,7 +337,6 @@ mod tests {
                 "history_log_id": session_configured_event.history_log_id,
                 "history_entry_count": session_configured_event.history_entry_count,
                 "type": "session_configured",
-                "rollout_path": rollout_file.path().to_path_buf(),
             }
         });
         assert_eq!(params.unwrap(), expected_params);

codex-rs/mcp-server/tests/common/Cargo.toml

@@ -13,14 +13,16 @@ codex-core = { path = "../../../core" }
 codex-mcp-server = { path = "../.." }
 codex-protocol = { path = "../../../protocol" }
 mcp-types = { path = "../../../mcp-types" }
-os_info = "3.12.0"
 pretty_assertions = "1.4.1"
 serde = { version = "1" }
 serde_json = "1"
+shlex = "1.3.0"
+tempfile = "3"
 tokio = { version = "1", features = [
     "io-std",
     "macros",
     "process",
     "rt-multi-thread",
 ] }
+uuid = { version = "1", features = ["serde", "v4"] }
 wiremock = "0.6"

codex-rs/mcp-server/tests/common/mcp_process.rs

@@ -13,7 +13,6 @@ use anyhow::Context;
 use assert_cmd::prelude::*;
 use codex_mcp_server::CodexToolCallParam;
 use codex_protocol::mcp_protocol::AddConversationListenerParams;
-use codex_protocol::mcp_protocol::ArchiveConversationParams;
 use codex_protocol::mcp_protocol::CancelLoginChatGptParams;
 use codex_protocol::mcp_protocol::GetAuthStatusParams;
 use codex_protocol::mcp_protocol::InterruptConversationParams;
@@ -54,18 +53,6 @@ pub struct McpProcess {
 
 impl McpProcess {
     pub async fn new(codex_home: &Path) -> anyhow::Result<Self> {
-        Self::new_with_env(codex_home, &[]).await
-    }
-
-    /// Creates a new MCP process, allowing tests to override or remove
-    /// specific environment variables for the child process only.
-    ///
-    /// Pass a tuple of (key, Some(value)) to set/override, or (key, None) to
-    /// remove a variable from the child's environment.
-    pub async fn new_with_env(
-        codex_home: &Path,
-        env_overrides: &[(&str, Option<&str>)],
-    ) -> anyhow::Result<Self> {
         // Use assert_cmd to locate the binary path and then switch to tokio::process::Command
         let std_cmd = StdCommand::cargo_bin("codex-mcp-server")
             .context("should find binary for codex-mcp-server")?;
@@ -80,17 +67,6 @@ impl McpProcess {
         cmd.env("CODEX_HOME", codex_home);
         cmd.env("RUST_LOG", "debug");
 
-        for (k, v) in env_overrides {
-            match v {
-                Some(val) => {
-                    cmd.env(k, val);
-                }
-                None => {
-                    cmd.env_remove(k);
-                }
-            }
-        }
-
         let mut process = cmd
             .kill_on_drop(true)
             .spawn()
@@ -138,7 +114,6 @@ impl McpProcess {
                 name: "elicitation test".into(),
                 title: Some("Elicitation Test".into()),
                 version: "0.0.0".into(),
-                user_agent: None,
             },
             protocol_version: mcp_types::MCP_SCHEMA_VERSION.into(),
         };
@@ -153,14 +128,6 @@ impl McpProcess {
         .await?;
 
         let initialized = self.read_jsonrpc_message().await?;
-        let os_info = os_info::get();
-        let user_agent = format!(
-            "codex_cli_rs/0.0.0 ({} {}; {}) {} (elicitation test; 0.0.0)",
-            os_info.os_type(),
-            os_info.version(),
-            os_info.architecture().unwrap_or("unknown"),
-            codex_core::terminal::user_agent()
-        );
         assert_eq!(
             JSONRPCMessage::Response(JSONRPCResponse {
                 jsonrpc: JSONRPC_VERSION.into(),
@@ -174,8 +141,7 @@ impl McpProcess {
                     "serverInfo": {
                         "name": "codex-mcp-server",
                         "title": "Codex",
-                        "version": "0.0.0",
-                        "user_agent": user_agent
+                        "version": "0.0.0"
                     },
                     "protocolVersion": mcp_types::MCP_SCHEMA_VERSION
                 })
@@ -220,15 +186,6 @@ impl McpProcess {
         self.send_request("newConversation", params).await
     }
 
-    /// Send an `archiveConversation` JSON-RPC request.
-    pub async fn send_archive_conversation_request(
-        &mut self,
-        params: ArchiveConversationParams,
-    ) -> anyhow::Result<i64> {
-        let params = Some(serde_json::to_value(params)?);
-        self.send_request("archiveConversation", params).await
-    }
-
     /// Send an `addConversationListener` JSON-RPC request.
     pub async fn send_add_conversation_listener_request(
         &mut self,
@@ -290,16 +247,6 @@ impl McpProcess {
         self.send_request("getUserSavedConfig", None).await
     }
 
-    /// Send a `getUserAgent` JSON-RPC request.
-    pub async fn send_get_user_agent_request(&mut self) -> anyhow::Result<i64> {
-        self.send_request("getUserAgent", None).await
-    }
-
-    /// Send a `userInfo` JSON-RPC request.
-    pub async fn send_user_info_request(&mut self) -> anyhow::Result<i64> {
-        self.send_request("userInfo", None).await
-    }
-
     /// Send a `listConversations` JSON-RPC request.
     pub async fn send_list_conversations_request(
         &mut self,

codex-rs/mcp-server/tests/suite/archive_conversation.rs

@@ -1,105 +0,0 @@
-use std::path::Path;
-
-use codex_core::ARCHIVED_SESSIONS_SUBDIR;
-use codex_protocol::mcp_protocol::ArchiveConversationParams;
-use codex_protocol::mcp_protocol::ArchiveConversationResponse;
-use codex_protocol::mcp_protocol::NewConversationParams;
-use codex_protocol::mcp_protocol::NewConversationResponse;
-use mcp_test_support::McpProcess;
-use mcp_test_support::to_response;
-use mcp_types::JSONRPCResponse;
-use mcp_types::RequestId;
-use tempfile::TempDir;
-use tokio::time::timeout;
-
-const DEFAULT_READ_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(10);
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn archive_conversation_moves_rollout_into_archived_directory() {
-    let codex_home = TempDir::new().expect("create temp dir");
-    create_config_toml(codex_home.path()).expect("write config.toml");
-
-    let mut mcp = McpProcess::new(codex_home.path())
-        .await
-        .expect("spawn mcp process");
-    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize())
-        .await
-        .expect("initialize timeout")
-        .expect("initialize request");
-
-    let new_request_id = mcp
-        .send_new_conversation_request(NewConversationParams {
-            model: Some("mock-model".to_string()),
-            ..Default::default()
-        })
-        .await
-        .expect("send newConversation");
-    let new_response: JSONRPCResponse = timeout(
-        DEFAULT_READ_TIMEOUT,
-        mcp.read_stream_until_response_message(RequestId::Integer(new_request_id)),
-    )
-    .await
-    .expect("newConversation timeout")
-    .expect("newConversation response");
-
-    let NewConversationResponse {
-        conversation_id,
-        rollout_path,
-        ..
-    } = to_response::<NewConversationResponse>(new_response)
-        .expect("deserialize newConversation response");
-
-    assert!(
-        rollout_path.exists(),
-        "expected rollout path {} to exist",
-        rollout_path.display()
-    );
-
-    let archive_request_id = mcp
-        .send_archive_conversation_request(ArchiveConversationParams {
-            conversation_id,
-            rollout_path: rollout_path.clone(),
-        })
-        .await
-        .expect("send archiveConversation");
-    let archive_response: JSONRPCResponse = timeout(
-        DEFAULT_READ_TIMEOUT,
-        mcp.read_stream_until_response_message(RequestId::Integer(archive_request_id)),
-    )
-    .await
-    .expect("archiveConversation timeout")
-    .expect("archiveConversation response");
-
-    let _: ArchiveConversationResponse =
-        to_response::<ArchiveConversationResponse>(archive_response)
-            .expect("deserialize archiveConversation response");
-
-    let archived_directory = codex_home.path().join(ARCHIVED_SESSIONS_SUBDIR);
-    let archived_rollout_path =
-        archived_directory.join(rollout_path.file_name().unwrap_or_else(|| {
-            panic!("rollout path {} missing file name", rollout_path.display())
-        }));
-
-    assert!(
-        !rollout_path.exists(),
-        "expected rollout path {} to be moved",
-        rollout_path.display()
-    );
-    assert!(
-        archived_rollout_path.exists(),
-        "expected archived rollout path {} to exist",
-        archived_rollout_path.display()
-    );
-}
-
-fn create_config_toml(codex_home: &Path) -> std::io::Result<()> {
-    let config_toml = codex_home.join("config.toml");
-    std::fs::write(config_toml, config_contents())
-}
-
-fn config_contents() -> &'static str {
-    r#"model = "mock-model"
-approval_policy = "never"
-sandbox_mode = "read-only"
-"#
-}

codex-rs/mcp-server/tests/suite/auth.rs

@@ -41,7 +41,7 @@ async fn get_auth_status_no_auth() {
     let codex_home = TempDir::new().unwrap_or_else(|e| panic!("create tempdir: {e}"));
     create_config_toml(codex_home.path()).expect("write config.toml");
 
-    let mut mcp = McpProcess::new_with_env(codex_home.path(), &[("OPENAI_API_KEY", None)])
+    let mut mcp = McpProcess::new(codex_home.path())
         .await
         .expect("spawn mcp process");
     timeout(DEFAULT_READ_TIMEOUT, mcp.initialize())

codex-rs/mcp-server/tests/suite/codex_message_processor_flow.rs

@@ -90,7 +90,6 @@ async fn test_codex_jsonrpc_conversation_flow() {
     let NewConversationResponse {
         conversation_id,
         model,
-        rollout_path: _,
     } = new_conv_resp;
     assert_eq!(model, "mock-model");
 

codex-rs/mcp-server/tests/suite/create_conversation.rs

@@ -59,7 +59,6 @@ async fn test_conversation_create_and_send_message_ok() {
     let NewConversationResponse {
         conversation_id,
         model,
-        rollout_path: _,
     } = to_response::<NewConversationResponse>(new_conv_resp)
         .expect("deserialize newConversation response");
     assert_eq!(model, "o3");

codex-rs/mcp-server/tests/suite/list_resume.rs

@@ -142,7 +142,7 @@ async fn test_list_and_resume_conversations() {
     } = to_response::<ResumeConversationResponse>(resume_resp)
         .expect("deserialize resumeConversation response");
     // conversation id should be a valid UUID
-    let _: uuid::Uuid = conversation_id.into();
+    let _ = uuid::Uuid::from_bytes(conversation_id.0.into_bytes());
 }
 
 fn create_fake_rollout(codex_home: &Path, filename_ts: &str, meta_rfc3339: &str, preview: &str) {
@@ -156,45 +156,14 @@ fn create_fake_rollout(codex_home: &Path, filename_ts: &str, meta_rfc3339: &str,
 
     let file_path = dir.join(format!("rollout-{filename_ts}-{uuid}.jsonl"));
     let mut lines = Vec::new();
-    // Meta line with timestamp (flattened meta in payload for new schema)
+    // Meta line with timestamp
+    lines.push(json!({"timestamp": meta_rfc3339}).to_string());
+    // Minimal user message entry as a persisted response item
     lines.push(
         json!({
-            "timestamp": meta_rfc3339,
-            "type": "session_meta",
-            "payload": {
-                "id": uuid,
-                "timestamp": meta_rfc3339,
-                "cwd": "/",
-                "originator": "codex",
-                "cli_version": "0.0.0",
-                "instructions": null
-            }
-        })
-        .to_string(),
-    );
-    // Minimal user message entry as a persisted response item (with envelope timestamp)
-    lines.push(
-        json!({
-            "timestamp": meta_rfc3339,
-            "type":"response_item",
-            "payload": {
-                "type":"message",
-                "role":"user",
-                "content":[{"type":"input_text","text": preview}]
-            }
-        })
-        .to_string(),
-    );
-    // Add a matching user message event line to satisfy filters
-    lines.push(
-        json!({
-            "timestamp": meta_rfc3339,
-            "type":"event_msg",
-            "payload": {
-                "type":"user_message",
-                "message": preview,
-                "kind": "plain"
-            }
+            "type":"message",
+            "role":"user",
+            "content":[{"type":"input_text","text": preview}]
         })
         .to_string(),
     );

codex-rs/mcp-server/tests/suite/login.rs

@@ -46,7 +46,7 @@ async fn logout_chatgpt_removes_auth() {
     login_with_api_key(codex_home.path(), "sk-test-key").expect("seed api key");
     assert!(codex_home.path().join("auth.json").exists());
 
-    let mut mcp = McpProcess::new_with_env(codex_home.path(), &[("OPENAI_API_KEY", None)])
+    let mut mcp = McpProcess::new(codex_home.path())
         .await
         .expect("spawn mcp process");
     timeout(DEFAULT_READ_TIMEOUT, mcp.initialize())

codex-rs/mcp-server/tests/suite/mod.rs

@@ -1,5 +1,4 @@
 // Aggregates all former standalone integration tests as modules.
-mod archive_conversation;
 mod auth;
 mod codex_message_processor_flow;
 mod codex_tool;
@@ -9,5 +8,3 @@ mod interrupt;
 mod list_resume;
 mod login;
 mod send_message;
-mod user_agent;
-mod user_info;

codex-rs/mcp-server/tests/suite/user_agent.rs

@@ -1,50 +0,0 @@
-use codex_protocol::mcp_protocol::GetUserAgentResponse;
-use mcp_test_support::McpProcess;
-use mcp_test_support::to_response;
-use mcp_types::JSONRPCResponse;
-use mcp_types::RequestId;
-use pretty_assertions::assert_eq;
-use tempfile::TempDir;
-use tokio::time::timeout;
-
-const DEFAULT_READ_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(10);
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn get_user_agent_returns_current_codex_user_agent() {
-    let codex_home = TempDir::new().unwrap_or_else(|err| panic!("create tempdir: {err}"));
-
-    let mut mcp = McpProcess::new(codex_home.path())
-        .await
-        .expect("spawn mcp process");
-    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize())
-        .await
-        .expect("initialize timeout")
-        .expect("initialize request");
-
-    let request_id = mcp
-        .send_get_user_agent_request()
-        .await
-        .expect("send getUserAgent");
-    let response: JSONRPCResponse = timeout(
-        DEFAULT_READ_TIMEOUT,
-        mcp.read_stream_until_response_message(RequestId::Integer(request_id)),
-    )
-    .await
-    .expect("getUserAgent timeout")
-    .expect("getUserAgent response");
-
-    let os_info = os_info::get();
-    let user_agent = format!(
-        "codex_cli_rs/0.0.0 ({} {}; {}) {} (elicitation test; 0.0.0)",
-        os_info.os_type(),
-        os_info.version(),
-        os_info.architecture().unwrap_or("unknown"),
-        codex_core::terminal::user_agent()
-    );
-
-    let received: GetUserAgentResponse =
-        to_response(response).expect("deserialize getUserAgent response");
-    let expected = GetUserAgentResponse { user_agent };
-
-    assert_eq!(received, expected);
-}

codex-rs/mcp-server/tests/suite/user_info.rs

@@ -1,78 +0,0 @@
-use std::time::Duration;
-
-use anyhow::Context;
-use base64::Engine;
-use base64::engine::general_purpose::URL_SAFE_NO_PAD;
-use codex_core::auth::AuthDotJson;
-use codex_core::auth::get_auth_file;
-use codex_core::auth::write_auth_json;
-use codex_core::token_data::IdTokenInfo;
-use codex_core::token_data::TokenData;
-use codex_protocol::mcp_protocol::UserInfoResponse;
-use mcp_test_support::McpProcess;
-use mcp_test_support::to_response;
-use mcp_types::JSONRPCResponse;
-use mcp_types::RequestId;
-use pretty_assertions::assert_eq;
-use serde_json::json;
-use tempfile::TempDir;
-use tokio::time::timeout;
-
-const DEFAULT_READ_TIMEOUT: Duration = Duration::from_secs(10);
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn user_info_returns_email_from_auth_json() {
-    let codex_home = TempDir::new().expect("create tempdir");
-
-    let auth_path = get_auth_file(codex_home.path());
-    let mut id_token = IdTokenInfo::default();
-    id_token.email = Some("user@example.com".to_string());
-    id_token.raw_jwt = encode_id_token_with_email("user@example.com").expect("encode id token");
-
-    let auth = AuthDotJson {
-        openai_api_key: None,
-        tokens: Some(TokenData {
-            id_token,
-            access_token: "access".to_string(),
-            refresh_token: "refresh".to_string(),
-            account_id: None,
-        }),
-        last_refresh: None,
-    };
-    write_auth_json(&auth_path, &auth).expect("write auth.json");
-
-    let mut mcp = McpProcess::new(codex_home.path())
-        .await
-        .expect("spawn mcp process");
-    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize())
-        .await
-        .expect("initialize timeout")
-        .expect("initialize request");
-
-    let request_id = mcp.send_user_info_request().await.expect("send userInfo");
-    let response: JSONRPCResponse = timeout(
-        DEFAULT_READ_TIMEOUT,
-        mcp.read_stream_until_response_message(RequestId::Integer(request_id)),
-    )
-    .await
-    .expect("userInfo timeout")
-    .expect("userInfo response");
-
-    let received: UserInfoResponse = to_response(response).expect("deserialize userInfo response");
-    let expected = UserInfoResponse {
-        alleged_user_email: Some("user@example.com".to_string()),
-    };
-
-    assert_eq!(received, expected);
-}
-
-fn encode_id_token_with_email(email: &str) -> anyhow::Result<String> {
-    let header_b64 = URL_SAFE_NO_PAD.encode(
-        serde_json::to_vec(&json!({ "alg": "none", "typ": "JWT" }))
-            .context("serialize jwt header")?,
-    );
-    let payload =
-        serde_json::to_vec(&json!({ "email": email })).context("serialize jwt payload")?;
-    let payload_b64 = URL_SAFE_NO_PAD.encode(payload);
-    Ok(format!("{header_b64}.{payload_b64}.signature"))
-}

codex-rs/mcp-types/Cargo.toml

@@ -9,4 +9,4 @@ workspace = true
 [dependencies]
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-ts-rs = { version = "11", features = ["serde-json-impl", "no-serde-warnings"] }
+ts-rs = { version = "11", features = ["serde-json-impl"] }

codex-rs/mcp-types/generate_mcp_types.py

@@ -265,11 +265,8 @@ class StructField:
     name: str
     type_name: str
     serde: str | None = None
-    comment: str | None = None
 
     def append(self, out: list[str], supports_const: bool) -> None:
-        if self.comment:
-            out.append(f"    // {self.comment}\n")
         if self.serde:
             out.append(f"    {self.serde}\n")
         if self.viz == "const":
@@ -315,18 +312,6 @@ def define_struct(
         else:
             fields.append(StructField("pub", rs_prop.name, prop_type, rs_prop.serde))
 
-    # Special-case: add Codex-specific user_agent to Implementation
-    if name == "Implementation":
-        fields.append(
-            StructField(
-                "pub",
-                "user_agent",
-                "Option<String>",
-                '#[serde(default, skip_serializing_if = "Option::is_none")]',
-                "This is an extra field that the Codex MCP server sends as part of InitializeResult.",
-            )
-        )
-
     if implements_request_trait(name):
         add_trait_impl(name, "ModelContextProtocolRequest", fields, out)
     elif implements_notification_trait(name):

codex-rs/mcp-types/src/lib.rs

@@ -487,9 +487,6 @@ pub struct Implementation {
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub title: Option<String>,
     pub version: String,
-    // This is an extra field that the Codex MCP server sends as part of InitializeResult.
-    #[serde(default, skip_serializing_if = "Option::is_none")]
-    pub user_agent: Option<String>,
 }
 
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize, TS)]

codex-rs/mcp-types/tests/suite/initialize.rs

@@ -62,7 +62,6 @@ fn deserialize_initialize_request() {
                 name: "acme-client".into(),
                 title: Some("Acme".to_string()),
                 version: "1.2.3".into(),
-                user_agent: None,
             },
             protocol_version: "2025-06-18".into(),
         }

codex-rs/ollama/Cargo.toml

@@ -24,7 +24,9 @@ tokio = { version = "1", features = [
     "rt-multi-thread",
     "signal",
 ] }
+toml = "0.9.5"
 tracing = { version = "0.1.41", features = ["log"] }
 wiremock = "0.6"
 
 [dev-dependencies]
+tempfile = "3"

codex-rs/protocol-ts/Cargo.toml

@@ -16,7 +16,6 @@ path = "src/main.rs"
 
 [dependencies]
 anyhow = "1"
-mcp-types = { path = "../mcp-types" }
 codex-protocol = { path = "../protocol" }
 ts-rs = "11"
 clap = { version = "4", features = ["derive"] }

codex-rs/protocol-ts/src/lib.rs

@@ -16,33 +16,37 @@ pub fn generate_ts(out_dir: &Path, prettier: Option<&Path>) -> Result<()> {
     ensure_dir(out_dir)?;
 
     // Generate TS bindings
-    mcp_types::InitializeResult::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::ConversationId::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::InputItem::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::ClientRequest::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::ServerRequest::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::NewConversationParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::NewConversationResponse::export_all_to(out_dir)?;
-    codex_protocol::mcp_protocol::ListConversationsResponse::export_all_to(out_dir)?;
-    codex_protocol::mcp_protocol::ResumeConversationResponse::export_all_to(out_dir)?;
-    codex_protocol::mcp_protocol::ArchiveConversationResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::AddConversationListenerParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::AddConversationSubscriptionResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::RemoveConversationListenerParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::RemoveConversationSubscriptionResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::SendUserMessageParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::SendUserMessageResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::SendUserTurnParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::SendUserTurnResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::InterruptConversationParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::InterruptConversationResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::GitDiffToRemoteParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::GitDiffToRemoteResponse::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::LoginChatGptResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::LoginChatGptCompleteNotification::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::CancelLoginChatGptParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::CancelLoginChatGptResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::LogoutChatGptParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::LogoutChatGptResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::GetAuthStatusParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::GetAuthStatusResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::ApplyPatchApprovalParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::ApplyPatchApprovalResponse::export_all_to(out_dir)?;
+    codex_protocol::mcp_protocol::ExecCommandApprovalParams::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::ExecCommandApprovalResponse::export_all_to(out_dir)?;
     codex_protocol::mcp_protocol::GetUserSavedConfigResponse::export_all_to(out_dir)?;
-    codex_protocol::mcp_protocol::GetUserAgentResponse::export_all_to(out_dir)?;
-    codex_protocol::mcp_protocol::UserInfoResponse::export_all_to(out_dir)?;
-
-    // All notification types reachable from this enum will be generated by
-    // induction, so they do not need to be listed individually.
     codex_protocol::mcp_protocol::ServerNotification::export_all_to(out_dir)?;
 
     generate_index_ts(out_dir)?;

codex-rs/protocol/Cargo.toml

@@ -12,24 +12,17 @@ workspace = true
 
 [dependencies]
 base64 = "0.22.1"
-icu_decimal = "2.0.0"
-icu_locale_core = "2.0.0"
 mcp-types = { path = "../mcp-types" }
 mime_guess = "2.0.5"
 serde = { version = "1", features = ["derive"] }
+serde_bytes = "0.11"
 serde_json = "1"
 serde_with = { version = "3.14.0", features = ["macros", "base64"] }
 strum = "0.27.2"
 strum_macros = "0.27.2"
-sys-locale = "0.3.2"
 tracing = "0.1.41"
-ts-rs = { version = "11", features = ["uuid-impl", "serde-json-impl", "no-serde-warnings"] }
+ts-rs = { version = "11", features = ["uuid-impl", "serde-json-impl"] }
 uuid = { version = "1", features = ["serde", "v4"] }
 
 [dev-dependencies]
 pretty_assertions = "1.4.1"
-tempfile = "3"
-
-[package.metadata.cargo-shear]
-# Required because the not imported as strum_macros in non-nightly builds.
-ignored = ["strum"]

codex-rs/protocol/src/custom_prompts.rs

@@ -1,9 +1,8 @@
 use serde::Deserialize;
 use serde::Serialize;
 use std::path::PathBuf;
-use ts_rs::TS;
 
-#[derive(Serialize, Deserialize, Debug, Clone, TS)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct CustomPrompt {
     pub name: String,
     pub path: PathBuf,

codex-rs/protocol/src/lib.rs

@@ -3,7 +3,6 @@ pub mod custom_prompts;
 pub mod mcp_protocol;
 pub mod message_history;
 pub mod models;
-pub mod num_format;
 pub mod parse_command;
 pub mod plan_tool;
 pub mod protocol;

codex-rs/protocol/src/mcp_protocol.rs

@@ -19,40 +19,16 @@ use strum_macros::Display;
 use ts_rs::TS;
 use uuid::Uuid;
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, TS, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, TS)]
 #[ts(type = "string")]
 pub struct ConversationId(pub Uuid);
 
-impl ConversationId {
-    pub fn new() -> Self {
-        Self(Uuid::new_v4())
-    }
-}
-
-impl Default for ConversationId {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
 impl Display for ConversationId {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{}", self.0)
     }
 }
 
-impl From<Uuid> for ConversationId {
-    fn from(value: Uuid) -> Self {
-        Self(value)
-    }
-}
-
-impl From<ConversationId> for Uuid {
-    fn from(value: ConversationId) -> Self {
-        value.0
-    }
-}
-
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, TS)]
 #[ts(type = "string")]
 pub struct GitSha(pub String);
@@ -91,11 +67,6 @@ pub enum ClientRequest {
         request_id: RequestId,
         params: ResumeConversationParams,
     },
-    ArchiveConversation {
-        #[serde(rename = "id")]
-        request_id: RequestId,
-        params: ArchiveConversationParams,
-    },
     SendUserMessage {
         #[serde(rename = "id")]
         request_id: RequestId,
@@ -148,14 +119,6 @@ pub enum ClientRequest {
         #[serde(rename = "id")]
         request_id: RequestId,
     },
-    GetUserAgent {
-        #[serde(rename = "id")]
-        request_id: RequestId,
-    },
-    UserInfo {
-        #[serde(rename = "id")]
-        request_id: RequestId,
-    },
     /// Execute a command (argv vector) under the server's sandbox.
     ExecOneOffCommand {
         #[serde(rename = "id")]
@@ -212,10 +175,9 @@ pub struct NewConversationParams {
 pub struct NewConversationResponse {
     pub conversation_id: ConversationId,
     pub model: String,
-    pub rollout_path: PathBuf,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone, TS)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(rename_all = "camelCase")]
 pub struct ResumeConversationResponse {
     pub conversation_id: ConversationId,
@@ -238,7 +200,6 @@ pub struct ListConversationsParams {
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
 #[serde(rename_all = "camelCase")]
 pub struct ConversationSummary {
-    pub conversation_id: ConversationId,
     pub path: PathBuf,
     pub preview: String,
     /// RFC3339 timestamp string for the session start, if available.
@@ -272,18 +233,6 @@ pub struct AddConversationSubscriptionResponse {
     pub subscription_id: Uuid,
 }
 
-/// The [`ConversationId`] must match the `rollout_path`.
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
-#[serde(rename_all = "camelCase")]
-pub struct ArchiveConversationParams {
-    pub conversation_id: ConversationId,
-    pub rollout_path: PathBuf,
-}
-
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
-#[serde(rename_all = "camelCase")]
-pub struct ArchiveConversationResponse {}
-
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
 #[serde(rename_all = "camelCase")]
 pub struct RemoveConversationSubscriptionResponse {}
@@ -372,22 +321,6 @@ pub struct GetAuthStatusResponse {
     pub auth_token: Option<String>,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
-#[serde(rename_all = "camelCase")]
-pub struct GetUserAgentResponse {
-    pub user_agent: String,
-}
-
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
-#[serde(rename_all = "camelCase")]
-pub struct UserInfoResponse {
-    /// Note: `alleged_user_email` is not currently verified. We read it from
-    /// the local auth.json, which the user could theoretically modify. In the
-    /// future, we may add logic to verify the email against the server before
-    /// returning it.
-    pub alleged_user_email: Option<String>,
-}
-
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, TS)]
 #[serde(rename_all = "camelCase")]
 pub struct GetUserSavedConfigResponse {
@@ -670,10 +603,4 @@ mod tests {
             serde_json::to_value(&request).unwrap(),
         );
     }
-
-    #[test]
-    fn test_conversation_id_default_is_not_zeroes() {
-        let id = ConversationId::default();
-        assert_ne!(id.0, Uuid::nil());
-    }
 }

codex-rs/protocol/src/message_history.rs

@@ -1,10 +1,9 @@
 use serde::Deserialize;
 use serde::Serialize;
-use ts_rs::TS;
 
-#[derive(Serialize, Deserialize, Debug, Clone, TS)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct HistoryEntry {
-    pub conversation_id: String,
+    pub session_id: String,
     pub ts: u64,
     pub text: String,
 }

codex-rs/protocol/src/models.rs

@@ -6,11 +6,10 @@ use serde::Deserialize;
 use serde::Deserializer;
 use serde::Serialize;
 use serde::ser::Serializer;
-use ts_rs::TS;
 
 use crate::protocol::InputItem;
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ResponseInputItem {
     Message {
@@ -31,7 +30,7 @@ pub enum ResponseInputItem {
     },
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ContentItem {
     InputText { text: String },
@@ -39,7 +38,7 @@ pub enum ContentItem {
     OutputText { text: String },
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ResponseItem {
     Message {
@@ -49,7 +48,7 @@ pub enum ResponseItem {
         content: Vec<ContentItem>,
     },
     Reasoning {
-        #[serde(default, skip_serializing)]
+        #[serde(default)]
         id: String,
         summary: Vec<ReasoningItemReasoningSummary>,
         #[serde(default, skip_serializing_if = "should_serialize_reasoning_content")]
@@ -115,6 +114,20 @@ pub enum ResponseItem {
         status: Option<String>,
         action: WebSearchAction,
     },
+    UnifiedExec {
+        #[serde(skip_serializing)]
+        id: Option<String>,
+        /// Identifier for the interactive shell session. When absent, a new
+        /// session should be created.
+        session_id: Option<String>,
+        /// Characters that should be written to the interactive shell's
+        /// standard input.
+        arguments: Vec<String>,
+        /// Maximum amount of time to wait for additional output after writing
+        /// to stdin.
+        timeout_ms: Option<u64>,
+    },
+
     #[serde(other)]
     Other,
 }
@@ -159,7 +172,7 @@ impl From<ResponseInputItem> for ResponseItem {
     }
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(rename_all = "snake_case")]
 pub enum LocalShellStatus {
     Completed,
@@ -167,13 +180,13 @@ pub enum LocalShellStatus {
     Incomplete,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum LocalShellAction {
     Exec(LocalShellExecAction),
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct LocalShellExecAction {
     pub command: Vec<String>,
     pub timeout_ms: Option<u64>,
@@ -182,7 +195,7 @@ pub struct LocalShellExecAction {
     pub user: Option<String>,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum WebSearchAction {
     Search {
@@ -192,13 +205,13 @@ pub enum WebSearchAction {
     Other,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ReasoningItemReasoningSummary {
     SummaryText { text: String },
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ReasoningItemContent {
     ReasoningText { text: String },
@@ -242,7 +255,7 @@ impl From<Vec<InputItem>> for ResponseInputItem {
 
 /// If the `name` of a `ResponseItem::FunctionCall` is either `container.exec`
 /// or shell`, the `arguments` field should deserialize to this struct.
-#[derive(Deserialize, Debug, Clone, PartialEq, TS)]
+#[derive(Deserialize, Debug, Clone, PartialEq)]
 pub struct ShellToolCallParams {
     pub command: Vec<String>,
     pub workdir: Option<String>,
@@ -256,7 +269,7 @@ pub struct ShellToolCallParams {
     pub justification: Option<String>,
 }
 
-#[derive(Debug, Clone, PartialEq, TS)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct FunctionCallOutputPayload {
     pub content: String,
     pub success: Option<bool>,

codex-rs/protocol/src/num_format.rs

@@ -1,98 +0,0 @@
-use std::sync::OnceLock;
-
-use icu_decimal::DecimalFormatter;
-use icu_decimal::input::Decimal;
-use icu_decimal::options::DecimalFormatterOptions;
-use icu_locale_core::Locale;
-
-fn make_local_formatter() -> Option<DecimalFormatter> {
-    let loc: Locale = sys_locale::get_locale()?.parse().ok()?;
-    DecimalFormatter::try_new(loc.into(), DecimalFormatterOptions::default()).ok()
-}
-
-fn make_en_us_formatter() -> DecimalFormatter {
-    #![allow(clippy::expect_used)]
-    let loc: Locale = "en-US".parse().expect("en-US wasn't a valid locale");
-    DecimalFormatter::try_new(loc.into(), DecimalFormatterOptions::default())
-        .expect("en-US wasn't a valid locale")
-}
-
-fn formatter() -> &'static DecimalFormatter {
-    static FORMATTER: OnceLock<DecimalFormatter> = OnceLock::new();
-    FORMATTER.get_or_init(|| make_local_formatter().unwrap_or_else(make_en_us_formatter))
-}
-
-/// Format a u64 with locale-aware digit separators (e.g. "12345" -> "12,345"
-/// for en-US).
-pub fn format_with_separators(n: u64) -> String {
-    formatter().format(&Decimal::from(n)).to_string()
-}
-
-fn format_si_suffix_with_formatter(n: u64, formatter: &DecimalFormatter) -> String {
-    if n < 1000 {
-        return formatter.format(&Decimal::from(n)).to_string();
-    }
-
-    // Format `n / scale` with the requested number of fractional digits.
-    let format_scaled = |n: u64, scale: u64, frac_digits: u32| -> String {
-        let value = n as f64 / scale as f64;
-        let scaled: u64 = (value * 10f64.powi(frac_digits as i32)).round() as u64;
-        let mut dec = Decimal::from(scaled);
-        dec.multiply_pow10(-(frac_digits as i16));
-        formatter.format(&dec).to_string()
-    };
-
-    const UNITS: [(u64, &str); 3] = [(1_000, "K"), (1_000_000, "M"), (1_000_000_000, "G")];
-    let f = n as f64;
-    for &(scale, suffix) in &UNITS {
-        if (100.0 * f / scale as f64).round() < 1000.0 {
-            return format!("{}{}", format_scaled(n, scale, 2), suffix);
-        } else if (10.0 * f / scale as f64).round() < 1000.0 {
-            return format!("{}{}", format_scaled(n, scale, 1), suffix);
-        } else if (f / scale as f64).round() < 1000.0 {
-            return format!("{}{}", format_scaled(n, scale, 0), suffix);
-        }
-    }
-
-    // Above 1000G, keep whole‑G precision.
-    format!(
-        "{}G",
-        format_with_separators(((n as f64) / 1e9).round() as u64)
-    )
-}
-
-/// Format token counts to 3 significant figures, using base-10 SI suffixes.
-///
-/// Examples (en-US):
-///   - 999 -> "999"
-///   - 1200 -> "1.20K"
-///   - 123456789 -> "123M"
-pub fn format_si_suffix(n: u64) -> String {
-    format_si_suffix_with_formatter(n, formatter())
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn kmg() {
-        let formatter = make_en_us_formatter();
-        let fmt = |n: u64| format_si_suffix_with_formatter(n, &formatter);
-        assert_eq!(fmt(0), "0");
-        assert_eq!(fmt(999), "999");
-        assert_eq!(fmt(1_000), "1.00K");
-        assert_eq!(fmt(1_200), "1.20K");
-        assert_eq!(fmt(10_000), "10.0K");
-        assert_eq!(fmt(100_000), "100K");
-        assert_eq!(fmt(999_500), "1.00M");
-        assert_eq!(fmt(1_000_000), "1.00M");
-        assert_eq!(fmt(1_234_000), "1.23M");
-        assert_eq!(fmt(12_345_678), "12.3M");
-        assert_eq!(fmt(999_950_000), "1.00G");
-        assert_eq!(fmt(1_000_000_000), "1.00G");
-        assert_eq!(fmt(1_234_000_000), "1.23G");
-        // Above 1000G we keep whole‑G precision (no higher unit supported here).
-        assert_eq!(fmt(1_234_000_000_000), "1,234G");
-    }
-}

codex-rs/protocol/src/parse_command.rs

@@ -1,8 +1,7 @@
 use serde::Deserialize;
 use serde::Serialize;
-use ts_rs::TS;
 
-#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ParsedCommand {
     Read {

codex-rs/protocol/src/plan_tool.rs

@@ -1,9 +1,8 @@
 use serde::Deserialize;
 use serde::Serialize;
-use ts_rs::TS;
 
 // Types for the TODO tool arguments matching codex-vscode/todo-mcp/src/main.rs
-#[derive(Debug, Clone, Serialize, Deserialize, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum StepStatus {
     Pending,
@@ -11,14 +10,14 @@ pub enum StepStatus {
     Completed,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct PlanItemArg {
     pub step: String,
     pub status: StepStatus,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, TS)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct UpdatePlanArgs {
     #[serde(default)]

codex-rs/protocol/src/protocol.rs

@@ -10,15 +10,7 @@ use std::path::PathBuf;
 use std::str::FromStr;
 use std::time::Duration;
 
-use crate::config_types::ReasoningEffort as ReasoningEffortConfig;
-use crate::config_types::ReasoningSummary as ReasoningSummaryConfig;
 use crate::custom_prompts::CustomPrompt;
-use crate::mcp_protocol::ConversationId;
-use crate::message_history::HistoryEntry;
-use crate::models::ResponseItem;
-use crate::num_format::format_with_separators;
-use crate::parse_command::ParsedCommand;
-use crate::plan_tool::UpdatePlanArgs;
 use mcp_types::CallToolResult;
 use mcp_types::Tool as McpTool;
 use serde::Deserialize;
@@ -26,6 +18,14 @@ use serde::Serialize;
 use serde_with::serde_as;
 use strum_macros::Display;
 use ts_rs::TS;
+use uuid::Uuid;
+
+use crate::config_types::ReasoningEffort as ReasoningEffortConfig;
+use crate::config_types::ReasoningSummary as ReasoningSummaryConfig;
+use crate::message_history::HistoryEntry;
+use crate::models::ResponseItem;
+use crate::parse_command::ParsedCommand;
+use crate::plan_tool::UpdatePlanArgs;
 
 /// Open/close tags for special user-input blocks. Used across crates to avoid
 /// duplicated hardcoded strings.
@@ -33,7 +33,6 @@ pub const USER_INSTRUCTIONS_OPEN_TAG: &str = "<user_instructions>";
 pub const USER_INSTRUCTIONS_CLOSE_TAG: &str = "</user_instructions>";
 pub const ENVIRONMENT_CONTEXT_OPEN_TAG: &str = "<environment_context>";
 pub const ENVIRONMENT_CONTEXT_CLOSE_TAG: &str = "</environment_context>";
-pub const USER_MESSAGE_BEGIN: &str = "## My request for Codex:";
 
 /// Submission Queue Entry - requests from user
 #[derive(Debug, Clone, Deserialize, Serialize)]
@@ -149,7 +148,7 @@ pub enum Op {
 
     /// Request the full in-memory conversation transcript for the current session.
     /// Reply is delivered via `EventMsg::ConversationHistory`.
-    GetPath,
+    GetHistory,
 
     /// Request the list of MCP tools available across all configured servers.
     /// Reply is delivered via `EventMsg::McpListToolsResponse`.
@@ -405,7 +404,7 @@ pub struct Event {
 }
 
 /// Response event from the agent
-#[derive(Debug, Clone, Deserialize, Serialize, Display, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize, Display)]
 #[serde(tag = "type", rename_all = "snake_case")]
 #[strum(serialize_all = "snake_case")]
 pub enum EventMsg {
@@ -418,9 +417,9 @@ pub enum EventMsg {
     /// Agent has completed all actions
     TaskComplete(TaskCompleteEvent),
 
-    /// Usage update for the current session, including totals and last turn.
-    /// Optional means unknown — UIs should not display when `None`.
-    TokenCount(TokenCountEvent),
+    /// Token count event, sent periodically to report the number of tokens
+    /// used in the current session.
+    TokenCount(TokenUsage),
 
     /// Agent text output message
     AgentMessage(AgentMessageEvent),
@@ -499,77 +498,35 @@ pub enum EventMsg {
     /// Notification that the agent is shutting down.
     ShutdownComplete,
 
-    ConversationPath(ConversationPathResponseEvent),
+    ConversationHistory(ConversationHistoryResponseEvent),
 }
 
 // Individual event payload types matching each `EventMsg` variant.
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct ErrorEvent {
     pub message: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct TaskCompleteEvent {
     pub last_agent_message: Option<String>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct TaskStartedEvent {
     pub model_context_window: Option<u64>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, Default, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize, Default)]
 pub struct TokenUsage {
     pub input_tokens: u64,
-    pub cached_input_tokens: u64,
+    pub cached_input_tokens: Option<u64>,
     pub output_tokens: u64,
-    pub reasoning_output_tokens: u64,
+    pub reasoning_output_tokens: Option<u64>,
     pub total_tokens: u64,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
-pub struct TokenUsageInfo {
-    pub total_token_usage: TokenUsage,
-    pub last_token_usage: TokenUsage,
-    pub model_context_window: Option<u64>,
-}
-
-impl TokenUsageInfo {
-    pub fn new_or_append(
-        info: &Option<TokenUsageInfo>,
-        last: &Option<TokenUsage>,
-        model_context_window: Option<u64>,
-    ) -> Option<Self> {
-        if info.is_none() && last.is_none() {
-            return None;
-        }
-
-        let mut info = match info {
-            Some(info) => info.clone(),
-            None => Self {
-                total_token_usage: TokenUsage::default(),
-                last_token_usage: TokenUsage::default(),
-                model_context_window,
-            },
-        };
-        if let Some(last) = last {
-            info.append_last_usage(last);
-        }
-        Some(info)
-    }
-
-    pub fn append_last_usage(&mut self, last: &TokenUsage) {
-        self.total_token_usage.add_assign(last);
-        self.last_token_usage = last.clone();
-    }
-}
-
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
-pub struct TokenCountEvent {
-    pub info: Option<TokenUsageInfo>,
-}
-
 // Includes prompts, tools and space to call compact.
 const BASELINE_TOKENS: u64 = 12000;
 
@@ -579,7 +536,7 @@ impl TokenUsage {
     }
 
     pub fn cached_input(&self) -> u64 {
-        self.cached_input_tokens
+        self.cached_input_tokens.unwrap_or(0)
     }
 
     pub fn non_cached_input(&self) -> u64 {
@@ -597,7 +554,7 @@ impl TokenUsage {
     /// This will be off for the current turn and pending function calls.
     pub fn tokens_in_context_window(&self) -> u64 {
         self.total_tokens
-            .saturating_sub(self.reasoning_output_tokens)
+            .saturating_sub(self.reasoning_output_tokens.unwrap_or(0))
     }
 
     /// Estimate the remaining user-controllable percentage of the model's context window.
@@ -622,15 +579,6 @@ impl TokenUsage {
         let remaining = effective_window.saturating_sub(used);
         ((remaining as f32 / effective_window as f32) * 100.0).clamp(0.0, 100.0) as u8
     }
-
-    /// In-place element-wise sum of token counts.
-    pub fn add_assign(&mut self, other: &TokenUsage) {
-        self.input_tokens += other.input_tokens;
-        self.cached_input_tokens += other.cached_input_tokens;
-        self.output_tokens += other.output_tokens;
-        self.reasoning_output_tokens += other.reasoning_output_tokens;
-        self.total_tokens += other.total_tokens;
-    }
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
@@ -647,39 +595,31 @@ impl From<TokenUsage> for FinalOutput {
 impl fmt::Display for FinalOutput {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let token_usage = &self.token_usage;
-
         write!(
             f,
             "Token usage: total={} input={}{} output={}{}",
-            format_with_separators(token_usage.blended_total()),
-            format_with_separators(token_usage.non_cached_input()),
+            token_usage.blended_total(),
+            token_usage.non_cached_input(),
             if token_usage.cached_input() > 0 {
-                format!(
-                    " (+ {} cached)",
-                    format_with_separators(token_usage.cached_input())
-                )
+                format!(" (+ {} cached)", token_usage.cached_input())
             } else {
                 String::new()
             },
-            format_with_separators(token_usage.output_tokens),
-            if token_usage.reasoning_output_tokens > 0 {
-                format!(
-                    " (reasoning {})",
-                    format_with_separators(token_usage.reasoning_output_tokens)
-                )
-            } else {
-                String::new()
-            }
+            token_usage.output_tokens,
+            token_usage
+                .reasoning_output_tokens
+                .map(|r| format!(" (reasoning {r})"))
+                .unwrap_or_default()
         )
     }
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentMessageEvent {
     pub message: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "snake_case")]
 pub enum InputMessageKind {
     /// Plain user text (default)
@@ -690,13 +630,11 @@ pub enum InputMessageKind {
     EnvironmentContext,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct UserMessageEvent {
     pub message: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub kind: Option<InputMessageKind>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub images: Option<Vec<String>>,
 }
 
 impl<T, U> From<(T, U)> for InputMessageKind
@@ -722,35 +660,35 @@ where
     }
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentMessageDeltaEvent {
     pub delta: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentReasoningEvent {
     pub text: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentReasoningRawContentEvent {
     pub text: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentReasoningRawContentDeltaEvent {
     pub delta: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentReasoningSectionBreakEvent {}
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentReasoningDeltaEvent {
     pub delta: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct McpInvocation {
     /// Name of the MCP server as defined in the config.
     pub server: String,
@@ -760,19 +698,18 @@ pub struct McpInvocation {
     pub arguments: Option<serde_json::Value>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct McpToolCallBeginEvent {
     /// Identifier so this can be paired with the McpToolCallEnd event.
     pub call_id: String,
     pub invocation: McpInvocation,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct McpToolCallEndEvent {
     /// Identifier for the corresponding McpToolCallBegin that finished.
     pub call_id: String,
     pub invocation: McpInvocation,
-    #[ts(type = "string")]
     pub duration: Duration,
     /// Result of the tool call. Note this could be an error.
     pub result: Result<CallToolResult, String>,
@@ -787,12 +724,12 @@ impl McpToolCallEndEvent {
     }
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct WebSearchBeginEvent {
     pub call_id: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct WebSearchEndEvent {
     pub call_id: String,
     pub query: String,
@@ -800,127 +737,13 @@ pub struct WebSearchEndEvent {
 
 /// Response payload for `Op::GetHistory` containing the current session's
 /// in-memory transcript.
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
-pub struct ConversationPathResponseEvent {
-    pub conversation_id: ConversationId,
-    pub path: PathBuf,
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ConversationHistoryResponseEvent {
+    pub conversation_id: Uuid,
+    pub entries: Vec<ResponseItem>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
-pub struct ResumedHistory {
-    pub conversation_id: ConversationId,
-    pub history: Vec<RolloutItem>,
-    pub rollout_path: PathBuf,
-}
-
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
-pub enum InitialHistory {
-    New,
-    Resumed(ResumedHistory),
-    Forked(Vec<RolloutItem>),
-}
-
-impl InitialHistory {
-    pub fn get_rollout_items(&self) -> Vec<RolloutItem> {
-        match self {
-            InitialHistory::New => Vec::new(),
-            InitialHistory::Resumed(resumed) => resumed.history.clone(),
-            InitialHistory::Forked(items) => items.clone(),
-        }
-    }
-    pub fn get_response_items(&self) -> Vec<ResponseItem> {
-        match self {
-            InitialHistory::New => Vec::new(),
-            InitialHistory::Resumed(resumed) => resumed
-                .history
-                .iter()
-                .filter_map(|ri| match ri {
-                    RolloutItem::ResponseItem(item) => Some(item.clone()),
-                    _ => None,
-                })
-                .collect(),
-            InitialHistory::Forked(items) => items
-                .iter()
-                .filter_map(|ri| match ri {
-                    RolloutItem::ResponseItem(item) => Some(item.clone()),
-                    _ => None,
-                })
-                .collect(),
-        }
-    }
-    pub fn get_event_msgs(&self) -> Option<Vec<EventMsg>> {
-        match self {
-            InitialHistory::New => None,
-            InitialHistory::Resumed(resumed) => Some(
-                resumed
-                    .history
-                    .iter()
-                    .filter_map(|ri| match ri {
-                        RolloutItem::EventMsg(ev) => Some(ev.clone()),
-                        _ => None,
-                    })
-                    .collect(),
-            ),
-            InitialHistory::Forked(items) => Some(
-                items
-                    .iter()
-                    .filter_map(|ri| match ri {
-                        RolloutItem::EventMsg(ev) => Some(ev.clone()),
-                        _ => None,
-                    })
-                    .collect(),
-            ),
-        }
-    }
-}
-
-#[derive(Serialize, Deserialize, Clone, Default, Debug, TS)]
-pub struct SessionMeta {
-    pub id: ConversationId,
-    pub timestamp: String,
-    pub cwd: PathBuf,
-    pub originator: String,
-    pub cli_version: String,
-    pub instructions: Option<String>,
-}
-
-#[derive(Serialize, Deserialize, Debug, Clone, TS)]
-pub struct SessionMetaLine {
-    #[serde(flatten)]
-    pub meta: SessionMeta,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub git: Option<GitInfo>,
-}
-
-#[derive(Serialize, Deserialize, Debug, Clone, TS)]
-#[serde(tag = "type", content = "payload", rename_all = "snake_case")]
-pub enum RolloutItem {
-    SessionMeta(SessionMetaLine),
-    ResponseItem(ResponseItem),
-    EventMsg(EventMsg),
-}
-
-#[derive(Serialize, Deserialize, Clone)]
-pub struct RolloutLine {
-    pub timestamp: String,
-    #[serde(flatten)]
-    pub item: RolloutItem,
-}
-
-#[derive(Serialize, Deserialize, Clone, Debug, TS)]
-pub struct GitInfo {
-    /// Current commit hash (SHA)
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub commit_hash: Option<String>,
-    /// Current branch name
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub branch: Option<String>,
-    /// Repository URL (if available from remote)
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub repository_url: Option<String>,
-}
-
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct ExecCommandBeginEvent {
     /// Identifier so this can be paired with the ExecCommandEnd event.
     pub call_id: String,
@@ -931,7 +754,7 @@ pub struct ExecCommandBeginEvent {
     pub parsed_cmd: Vec<ParsedCommand>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct ExecCommandEndEvent {
     /// Identifier for the ExecCommandBegin that finished.
     pub call_id: String,
@@ -945,13 +768,12 @@ pub struct ExecCommandEndEvent {
     /// The command's exit code.
     pub exit_code: i32,
     /// The duration of the command execution.
-    #[ts(type = "string")]
     pub duration: Duration,
     /// Formatted output from the command, as seen by the model.
     pub formatted_output: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
 #[serde(rename_all = "snake_case")]
 pub enum ExecOutputStream {
     Stdout,
@@ -959,7 +781,7 @@ pub enum ExecOutputStream {
 }
 
 #[serde_as]
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
 pub struct ExecCommandOutputDeltaEvent {
     /// Identifier for the ExecCommandBegin that produced this chunk.
     pub call_id: String,
@@ -967,11 +789,10 @@ pub struct ExecCommandOutputDeltaEvent {
     pub stream: ExecOutputStream,
     /// Raw bytes from the stream (may not be valid UTF-8).
     #[serde_as(as = "serde_with::base64::Base64")]
-    #[ts(type = "string")]
     pub chunk: Vec<u8>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct ExecApprovalRequestEvent {
     /// Identifier for the associated exec call, if available.
     pub call_id: String,
@@ -984,7 +805,7 @@ pub struct ExecApprovalRequestEvent {
     pub reason: Option<String>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct ApplyPatchApprovalRequestEvent {
     /// Responses API call id for the associated patch apply call, if available.
     pub call_id: String,
@@ -997,17 +818,17 @@ pub struct ApplyPatchApprovalRequestEvent {
     pub grant_root: Option<PathBuf>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct BackgroundEventEvent {
     pub message: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct StreamErrorEvent {
     pub message: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct PatchApplyBeginEvent {
     /// Identifier so this can be paired with the PatchApplyEnd event.
     pub call_id: String,
@@ -1017,7 +838,7 @@ pub struct PatchApplyBeginEvent {
     pub changes: HashMap<PathBuf, FileChange>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct PatchApplyEndEvent {
     /// Identifier for the PatchApplyBegin that finished.
     pub call_id: String,
@@ -1029,12 +850,12 @@ pub struct PatchApplyEndEvent {
     pub success: bool,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct TurnDiffEvent {
     pub unified_diff: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct GetHistoryEntryResponseEvent {
     pub offset: usize,
     pub log_id: u64,
@@ -1044,22 +865,22 @@ pub struct GetHistoryEntryResponseEvent {
 }
 
 /// Response payload for `Op::ListMcpTools`.
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct McpListToolsResponseEvent {
     /// Fully qualified tool name -> tool definition.
     pub tools: std::collections::HashMap<String, McpTool>,
 }
 
 /// Response payload for `Op::ListCustomPrompts`.
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct ListCustomPromptsResponseEvent {
     pub custom_prompts: Vec<CustomPrompt>,
 }
 
-#[derive(Debug, Default, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Default, Clone, Deserialize, Serialize)]
 pub struct SessionConfiguredEvent {
-    /// Name left as session_id instead of conversation_id for backwards compatibility.
-    pub session_id: ConversationId,
+    /// Unique id for this session.
+    pub session_id: Uuid,
 
     /// Tell the client what model is being queried.
     pub model: String,
@@ -1074,8 +895,6 @@ pub struct SessionConfiguredEvent {
     /// When present, UIs can use these to seed the history.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub initial_messages: Option<Vec<EventMsg>>,
-
-    pub rollout_path: PathBuf,
 }
 
 /// User's decision in response to an ExecApprovalRequest.
@@ -1115,7 +934,7 @@ pub enum FileChange {
     },
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct Chunk {
     /// 1-based line index of the first line in the original file
     pub orig_index: u32,
@@ -1123,7 +942,7 @@ pub struct Chunk {
     pub inserted_lines: Vec<String>,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct TurnAbortedEvent {
     pub reason: TurnAbortReason,
 }
@@ -1138,39 +957,27 @@ pub enum TurnAbortReason {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use serde_json::json;
-    use tempfile::NamedTempFile;
 
     /// Serialize Event to verify that its JSON representation has the expected
     /// amount of nesting.
     #[test]
     fn serialize_event() {
-        let conversation_id = ConversationId(uuid::uuid!("67e55044-10b1-426f-9247-bb680e5fe0c8"));
-        let rollout_file = NamedTempFile::new().unwrap();
+        let session_id: Uuid = uuid::uuid!("67e55044-10b1-426f-9247-bb680e5fe0c8");
         let event = Event {
             id: "1234".to_string(),
             msg: EventMsg::SessionConfigured(SessionConfiguredEvent {
-                session_id: conversation_id,
+                session_id,
                 model: "codex-mini-latest".to_string(),
                 history_log_id: 0,
                 history_entry_count: 0,
                 initial_messages: None,
-                rollout_path: rollout_file.path().to_path_buf(),
             }),
         };
-
-        let expected = json!({
-            "id": "1234",
-            "msg": {
-                "type": "session_configured",
-                "session_id": "67e55044-10b1-426f-9247-bb680e5fe0c8",
-                "model": "codex-mini-latest",
-                "history_log_id": 0,
-                "history_entry_count": 0,
-                "rollout_path": format!("{}", rollout_file.path().display()),
-            }
-        });
-        assert_eq!(expected, serde_json::to_value(&event).unwrap());
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert_eq!(
+            serialized,
+            r#"{"id":"1234","msg":{"type":"session_configured","session_id":"67e55044-10b1-426f-9247-bb680e5fe0c8","model":"codex-mini-latest","history_log_id":0,"history_entry_count":0}}"#
+        );
     }
 
     #[test]

codex-rs/scripts/create_github_release

@@ -1,296 +0,0 @@
-#!/usr/bin/env python3
-
-import argparse
-import base64
-import json
-import re
-import subprocess
-import sys
-
-
-REPO = "openai/codex"
-BRANCH_REF = "heads/main"
-CARGO_TOML_PATH = "codex-rs/Cargo.toml"
-
-
-def parse_args(argv: list[str]) -> argparse.Namespace:
-    parser = argparse.ArgumentParser(description="Publish a tagged Codex release.")
-    parser.add_argument(
-        "-n",
-        "--dry-run",
-        action="store_true",
-        help="Print the version that would be used and exit before making changes.",
-    )
-
-    group = parser.add_mutually_exclusive_group(required=True)
-    group.add_argument(
-        "--publish-alpha",
-        action="store_true",
-        help="Publish the next alpha release for the upcoming minor version.",
-    )
-    group.add_argument(
-        "--publish-release",
-        action="store_true",
-        help="Publish the next stable release by bumping the minor version.",
-    )
-    return parser.parse_args(argv[1:])
-
-
-def main(argv: list[str]) -> int:
-    args = parse_args(argv)
-    try:
-        version = determine_version(args)
-        print(f"Publishing version {version}")
-        if args.dry_run:
-            return 0
-
-        print("Fetching branch head...")
-        base_commit = get_branch_head()
-        print(f"Base commit: {base_commit}")
-        print("Fetching commit tree...")
-        base_tree = get_commit_tree(base_commit)
-        print(f"Base tree: {base_tree}")
-        print("Fetching Cargo.toml...")
-        current_contents = fetch_file_contents(base_commit)
-        print("Updating version...")
-        updated_contents = replace_version(current_contents, version)
-        print("Creating blob...")
-        blob_sha = create_blob(updated_contents)
-        print(f"Blob SHA: {blob_sha}")
-        print("Creating tree...")
-        tree_sha = create_tree(base_tree, blob_sha)
-        print(f"Tree SHA: {tree_sha}")
-        print("Creating commit...")
-        commit_sha = create_commit(version, tree_sha, base_commit)
-        print(f"Commit SHA: {commit_sha}")
-        print("Creating tag...")
-        tag_sha = create_tag(version, commit_sha)
-        print(f"Tag SHA: {tag_sha}")
-        print("Creating tag ref...")
-        create_tag_ref(version, tag_sha)
-        print("Done.")
-    except ReleaseError as error:
-        print(f"ERROR: {error}", file=sys.stderr)
-        return 1
-    return 0
-
-
-class ReleaseError(RuntimeError):
-    pass
-
-
-def run_gh_api(endpoint: str, *, method: str = "GET", payload: dict | None = None) -> dict:
-    print(f"Running gh api {method} {endpoint}")
-    command = [
-        "gh",
-        "api",
-        endpoint,
-        "--method",
-        method,
-        "-H",
-        "Accept: application/vnd.github+json",
-    ]
-    json_payload = None
-    if payload is not None:
-        json_payload = json.dumps(payload)
-        print(f"Payload: {json_payload}")
-        command.extend(["-H", "Content-Type: application/json", "--input", "-"])
-    result = subprocess.run(command, text=True, capture_output=True, input=json_payload)
-    if result.returncode != 0:
-        message = result.stderr.strip() or result.stdout.strip() or "gh api call failed"
-        raise ReleaseError(message)
-    try:
-        return json.loads(result.stdout or "{}")
-    except json.JSONDecodeError as error:
-        raise ReleaseError("Failed to parse response from gh api.") from error
-
-
-def get_branch_head() -> str:
-    response = run_gh_api(f"/repos/{REPO}/git/refs/{BRANCH_REF}")
-    try:
-        return response["object"]["sha"]
-    except KeyError as error:
-        raise ReleaseError("Unable to determine branch head.") from error
-
-
-def get_commit_tree(commit_sha: str) -> str:
-    response = run_gh_api(f"/repos/{REPO}/git/commits/{commit_sha}")
-    try:
-        return response["tree"]["sha"]
-    except KeyError as error:
-        raise ReleaseError("Commit response missing tree SHA.") from error
-
-
-def fetch_file_contents(ref_sha: str) -> str:
-    response = run_gh_api(f"/repos/{REPO}/contents/{CARGO_TOML_PATH}?ref={ref_sha}")
-    try:
-        encoded_content = response["content"].replace("\n", "")
-        encoding = response.get("encoding", "")
-    except KeyError as error:
-        raise ReleaseError("Failed to fetch Cargo.toml contents.") from error
-
-    if encoding != "base64":
-        raise ReleaseError(f"Unexpected Cargo.toml encoding: {encoding}")
-
-    try:
-        return base64.b64decode(encoded_content).decode("utf-8")
-    except (ValueError, UnicodeDecodeError) as error:
-        raise ReleaseError("Failed to decode Cargo.toml contents.") from error
-
-
-def replace_version(contents: str, version: str) -> str:
-    updated, matches = re.subn(
-        r'^version = "[^"]+"', f'version = "{version}"', contents, count=1, flags=re.MULTILINE
-    )
-    if matches != 1:
-        raise ReleaseError("Unable to update version in Cargo.toml.")
-    return updated
-
-
-def create_blob(content: str) -> str:
-    response = run_gh_api(
-        f"/repos/{REPO}/git/blobs",
-        method="POST",
-        payload={"content": content, "encoding": "utf-8"},
-    )
-    try:
-        return response["sha"]
-    except KeyError as error:
-        raise ReleaseError("Blob creation response missing SHA.") from error
-
-
-def create_tree(base_tree_sha: str, blob_sha: str) -> str:
-    response = run_gh_api(
-        f"/repos/{REPO}/git/trees",
-        method="POST",
-        payload={
-            "base_tree": base_tree_sha,
-            "tree": [
-                {
-                    "path": CARGO_TOML_PATH,
-                    "mode": "100644",
-                    "type": "blob",
-                    "sha": blob_sha,
-                }
-            ],
-        },
-    )
-    try:
-        return response["sha"]
-    except KeyError as error:
-        raise ReleaseError("Tree creation response missing SHA.") from error
-
-
-def create_commit(version: str, tree_sha: str, parent_sha: str) -> str:
-    response = run_gh_api(
-        f"/repos/{REPO}/git/commits",
-        method="POST",
-        payload={
-            "message": f"Release {version}",
-            "tree": tree_sha,
-            "parents": [parent_sha],
-        },
-    )
-    try:
-        return response["sha"]
-    except KeyError as error:
-        raise ReleaseError("Commit creation response missing SHA.") from error
-
-
-def create_tag(version: str, commit_sha: str) -> str:
-    tag_name = f"rust-v{version}"
-    response = run_gh_api(
-        f"/repos/{REPO}/git/tags",
-        method="POST",
-        payload={
-            "tag": tag_name,
-            "message": f"Release {version}",
-            "object": commit_sha,
-            "type": "commit",
-        },
-    )
-    try:
-        return response["sha"]
-    except KeyError as error:
-        raise ReleaseError("Tag creation response missing SHA.") from error
-
-
-def create_tag_ref(version: str, tag_sha: str) -> None:
-    tag_ref = f"refs/tags/rust-v{version}"
-    run_gh_api(
-        f"/repos/{REPO}/git/refs",
-        method="POST",
-        payload={"ref": tag_ref, "sha": tag_sha},
-    )
-
-
-def determine_version(args: argparse.Namespace) -> str:
-    latest_version = get_latest_release_version()
-    major, minor, patch = parse_semver(latest_version)
-    next_minor_version = format_version(major, minor + 1, patch)
-
-    if args.publish_release:
-        return next_minor_version
-
-    alpha_prefix = f"{next_minor_version}-alpha."
-    releases = list_releases()
-    highest_alpha = 0
-    found_alpha = False
-    for release in releases:
-        tag = release.get("tag_name", "")
-        candidate = strip_tag_prefix(tag)
-        if candidate and candidate.startswith(alpha_prefix):
-            suffix = candidate[len(alpha_prefix) :]
-            try:
-                alpha_number = int(suffix)
-            except ValueError:
-                continue
-            highest_alpha = max(highest_alpha, alpha_number)
-            found_alpha = True
-
-    if found_alpha:
-        return f"{alpha_prefix}{highest_alpha + 1}"
-    return f"{alpha_prefix}1"
-
-
-def get_latest_release_version() -> str:
-    response = run_gh_api(f"/repos/{REPO}/releases/latest")
-    tag = response.get("tag_name")
-    version = strip_tag_prefix(tag)
-    if not version:
-        raise ReleaseError("Latest release tag has unexpected format.")
-    return version
-
-
-def list_releases() -> list[dict]:
-    response = run_gh_api(f"/repos/{REPO}/releases?per_page=100")
-    if not isinstance(response, list):
-        raise ReleaseError("Unexpected response when listing releases.")
-    return response
-
-
-def strip_tag_prefix(tag: str | None) -> str | None:
-    if not tag:
-        return None
-    prefix = "rust-v"
-    if not tag.startswith(prefix):
-        return None
-    return tag[len(prefix) :]
-
-
-def parse_semver(version: str) -> tuple[int, int, int]:
-    parts = version.split(".")
-    if len(parts) != 3:
-        raise ReleaseError(f"Unexpected version format: {version}")
-    try:
-        return int(parts[0]), int(parts[1]), int(parts[2])
-    except ValueError as error:
-        raise ReleaseError(f"Version components must be integers: {version}") from error
-
-
-def format_version(major: int, minor: int, patch: int) -> str:
-    return f"{major}.{minor}.{patch}"
-
-
-if __name__ == "__main__":
-    sys.exit(main(sys.argv))

codex-rs/scripts/create_github_release.sh

@@ -0,0 +1,64 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# By default, this script uses a version based on the current date and time.
+# If you want to specify a version, pass it as the first argument. Example:
+#
+#     ./scripts/create_github_release.sh 0.1.0-alpha.4
+#
+# The value will be used to update the `version` field in `Cargo.toml`.
+
+# Change to the root of the Cargo workspace.
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
+
+# Cancel if there are uncommitted changes.
+if ! git diff --quiet || ! git diff --cached --quiet || [ -n "$(git ls-files --others --exclude-standard)" ]; then
+  echo "ERROR: You have uncommitted or untracked changes." >&2
+  exit 1
+fi
+
+# Fail if in a detached HEAD state.
+CURRENT_BRANCH=$(git symbolic-ref --short -q HEAD 2>/dev/null || true)
+if [ -z "${CURRENT_BRANCH:-}" ]; then
+  echo "ERROR: Could not determine the current branch (detached HEAD?)." >&2
+  echo "       Please run this script from a checked-out branch." >&2
+  exit 1
+fi
+
+# Ensure we are on the 'main' branch before proceeding.
+if [ "${CURRENT_BRANCH}" != "main" ]; then
+  echo "ERROR: Releases must be created from the 'main' branch (current: '${CURRENT_BRANCH}')." >&2
+  echo "       Please switch to 'main' and try again." >&2
+  exit 1
+fi
+
+# Ensure the current local commit on 'main' is present on 'origin/main'.
+# This guarantees we only create releases from commits that are already on
+# the canonical repository (https://github.com/openai/codex).
+if ! git fetch --quiet origin main; then
+  echo "ERROR: Failed to fetch 'origin/main'. Ensure the 'origin' remote is configured and reachable." >&2
+  exit 1
+fi
+
+if ! git merge-base --is-ancestor HEAD origin/main; then
+  echo "ERROR: Your local 'main' HEAD commit is not present on 'origin/main'." >&2
+  echo "       Please push your commits first (git push origin main) or check out a commit on 'origin/main'." >&2
+  exit 1
+fi
+
+# Create a new branch for the release and make a commit with the new version.
+if [ $# -ge 1 ]; then
+  VERSION="$1"
+else
+  VERSION=$(printf '0.0.%d' "$(date +%y%m%d%H%M)")
+fi
+TAG="rust-v$VERSION"
+git checkout -b "$TAG"
+perl -i -pe "s/^version = \".*\"/version = \"$VERSION\"/" Cargo.toml
+git add Cargo.toml
+git commit -m "Release $VERSION"
+git tag -a "$TAG" -m "Release $VERSION"
+git push origin "refs/tags/$TAG"
+
+git checkout "$CURRENT_BRANCH"

codex-rs/tui/Cargo.toml

@@ -44,7 +44,7 @@ crossterm = { version = "0.28.1", features = [
     "event-stream",
 ] }
 diffy = "0.4.2"
-image = { version = "^0.25.8", default-features = false, features = [
+image = { version = "^0.25.6", default-features = false, features = [
     "jpeg",
     "png",
 ] }
@@ -59,7 +59,9 @@ ratatui = { version = "0.29.0", features = [
     "unstable-rendered-line-info",
     "unstable-widget-ref",
 ] }
+ratatui-image = "8.0.0"
 regex-lite = "0.1"
+reqwest = { version = "0.12", features = ["json"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = { version = "1", features = ["preserve_order"] }
 shlex = "1.3.0"
@@ -79,10 +81,12 @@ tokio-stream = "0.1.17"
 tracing = { version = "0.1.41", features = ["log"] }
 tracing-appender = "0.2.3"
 tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
-pulldown-cmark = "0.10"
+tui-input = "0.14.0"
+tui-markdown = "0.3.3"
 unicode-segmentation = "1.12.0"
 unicode-width = "0.1"
 url = "2"
+uuid = "1"
 pathdiff = "0.2"
 
 [target.'cfg(unix)'.dependencies]
@@ -96,7 +100,7 @@ arboard = "3"
 
 [dev-dependencies]
 chrono = { version = "0.4", features = ["serde"] }
-insta = "1.43.2"
+insta = "1.43.1"
 pretty_assertions = "1"
 rand = "0.9"
 vt100 = "0.16.2"

codex-rs/tui/src/app_backtrack.rs

@@ -1,30 +1,26 @@
-use std::path::PathBuf;
-
 use crate::app::App;
 use crate::backtrack_helpers;
 use crate::pager_overlay::Overlay;
 use crate::tui;
 use crate::tui::TuiEvent;
-use codex_core::protocol::ConversationPathResponseEvent;
-use codex_protocol::mcp_protocol::ConversationId;
+use codex_core::protocol::ConversationHistoryResponseEvent;
 use color_eyre::eyre::Result;
 use crossterm::event::KeyCode;
 use crossterm::event::KeyEvent;
 use crossterm::event::KeyEventKind;
-
 /// Aggregates all backtrack-related state used by the App.
 #[derive(Default)]
 pub(crate) struct BacktrackState {
     /// True when Esc has primed backtrack mode in the main view.
     pub(crate) primed: bool,
     /// Session id of the base conversation to fork from.
-    pub(crate) base_id: Option<ConversationId>,
+    pub(crate) base_id: Option<uuid::Uuid>,
     /// Current step count (Nth last user message).
     pub(crate) count: usize,
     /// True when the transcript overlay is showing a backtrack preview.
     pub(crate) overlay_preview_active: bool,
     /// Pending fork request: (base_id, drop_count, prefill).
-    pub(crate) pending: Option<(ConversationId, usize, String)>,
+    pub(crate) pending: Option<(uuid::Uuid, usize, String)>,
 }
 
 impl App {
@@ -95,12 +91,12 @@ impl App {
     pub(crate) fn request_backtrack(
         &mut self,
         prefill: String,
-        base_id: ConversationId,
+        base_id: uuid::Uuid,
         drop_last_messages: usize,
     ) {
         self.backtrack.pending = Some((base_id, drop_last_messages, prefill));
         self.app_event_tx.send(crate::app_event::AppEvent::CodexOp(
-            codex_core::protocol::Op::GetPath,
+            codex_core::protocol::Op::GetHistory,
         ));
     }
 
@@ -139,7 +135,7 @@ impl App {
     fn prime_backtrack(&mut self) {
         self.backtrack.primed = true;
         self.backtrack.count = 0;
-        self.backtrack.base_id = self.chat_widget.conversation_id();
+        self.backtrack.base_id = self.chat_widget.session_id();
         self.chat_widget.show_esc_backtrack_hint();
     }
 
@@ -155,7 +151,7 @@ impl App {
     /// When overlay is already open, begin preview mode and select latest user message.
     fn begin_overlay_backtrack_preview(&mut self, tui: &mut tui::Tui) {
         self.backtrack.primed = true;
-        self.backtrack.base_id = self.chat_widget.conversation_id();
+        self.backtrack.base_id = self.chat_widget.session_id();
         self.backtrack.overlay_preview_active = true;
         let sel = self.compute_backtrack_selection(tui, 1);
         self.apply_backtrack_selection(sel);
@@ -267,7 +263,7 @@ impl App {
     pub(crate) async fn on_conversation_history_for_backtrack(
         &mut self,
         tui: &mut tui::Tui,
-        ev: ConversationPathResponseEvent,
+        ev: ConversationHistoryResponseEvent,
     ) -> Result<()> {
         if let Some((base_id, _, _)) = self.backtrack.pending.as_ref()
             && ev.conversation_id == *base_id
@@ -283,14 +279,14 @@ impl App {
     async fn fork_and_switch_to_new_conversation(
         &mut self,
         tui: &mut tui::Tui,
-        ev: ConversationPathResponseEvent,
+        ev: ConversationHistoryResponseEvent,
         drop_count: usize,
         prefill: String,
     ) {
         let cfg = self.chat_widget.config_ref().clone();
         // Perform the fork via a thin wrapper for clarity/testability.
         let result = self
-            .perform_fork(ev.path.clone(), drop_count, cfg.clone())
+            .perform_fork(ev.entries.clone(), drop_count, cfg.clone())
             .await;
         match result {
             Ok(new_conv) => {
@@ -303,11 +299,13 @@ impl App {
     /// Thin wrapper around ConversationManager::fork_conversation.
     async fn perform_fork(
         &self,
-        path: PathBuf,
+        entries: Vec<codex_protocol::models::ResponseItem>,
         drop_count: usize,
         cfg: codex_core::config::Config,
     ) -> codex_core::error::Result<codex_core::NewConversation> {
-        self.server.fork_conversation(drop_count, cfg, path).await
+        self.server
+            .fork_conversation(entries, drop_count, cfg)
+            .await
     }
 
     /// Install a forked conversation into the ChatWidget and update UI to reflect selection.

codex-rs/tui/src/app_event.rs

@@ -1,4 +1,4 @@
-use codex_core::protocol::ConversationPathResponseEvent;
+use codex_core::protocol::ConversationHistoryResponseEvent;
 use codex_core::protocol::Event;
 use codex_file_search::FileMatch;
 
@@ -58,5 +58,5 @@ pub(crate) enum AppEvent {
     UpdateSandboxPolicy(SandboxPolicy),
 
     /// Forwarded conversation history snapshot from the current conversation.
-    ConversationHistory(ConversationPathResponseEvent),
+    ConversationHistory(ConversationHistoryResponseEvent),
 }

codex-rs/tui/src/bin/md-events.rs

@@ -1,15 +0,0 @@
-use std::io::Read;
-use std::io::{self};
-
-fn main() {
-    let mut input = String::new();
-    if let Err(err) = io::stdin().read_to_string(&mut input) {
-        eprintln!("failed to read stdin: {err}");
-        std::process::exit(1);
-    }
-
-    let parser = pulldown_cmark::Parser::new(&input);
-    for event in parser {
-        println!("{event:?}");
-    }
-}

codex-rs/tui/src/bottom_pane/bottom_pane_view.rs

@@ -19,7 +19,7 @@ pub(crate) trait BottomPaneView {
 
     /// Handle Ctrl-C while this view is active.
     fn on_ctrl_c(&mut self, _pane: &mut BottomPane) -> CancellationEvent {
-        CancellationEvent::NotHandled
+        CancellationEvent::Ignored
     }
 
     /// Return the desired height of the view.

codex-rs/tui/src/bottom_pane/chat_composer.rs

@@ -1,5 +1,4 @@
-use codex_core::protocol::TokenUsageInfo;
-use codex_protocol::num_format::format_si_suffix;
+use codex_core::protocol::TokenUsage;
 use crossterm::event::KeyCode;
 use crossterm::event::KeyEvent;
 use crossterm::event::KeyEventKind;
@@ -64,6 +63,12 @@ struct AttachedImage {
     path: PathBuf,
 }
 
+struct TokenUsageInfo {
+    total_token_usage: TokenUsage,
+    last_token_usage: TokenUsage,
+    model_context_window: Option<u64>,
+}
+
 pub(crate) struct ChatComposer {
     textarea: TextArea,
     textarea_state: RefCell<TextAreaState>,
@@ -80,7 +85,6 @@ pub(crate) struct ChatComposer {
     has_focus: bool,
     attached_images: Vec<AttachedImage>,
     placeholder_text: String,
-    is_task_running: bool,
     // Non-bracketed paste burst tracker.
     paste_burst: PasteBurst,
     // When true, disables paste-burst logic and inserts characters immediately.
@@ -121,7 +125,6 @@ impl ChatComposer {
             has_focus: has_input_focus,
             attached_images: Vec::new(),
             placeholder_text,
-            is_task_running: false,
             paste_burst: PasteBurst::default(),
             disable_paste_burst: false,
             custom_prompts: Vec::new(),
@@ -163,8 +166,17 @@ impl ChatComposer {
     /// Update the cached *context-left* percentage and refresh the placeholder
     /// text. The UI relies on the placeholder to convey the remaining
     /// context when the composer is empty.
-    pub(crate) fn set_token_usage(&mut self, token_info: Option<TokenUsageInfo>) {
-        self.token_usage_info = token_info;
+    pub(crate) fn set_token_usage(
+        &mut self,
+        total_token_usage: TokenUsage,
+        last_token_usage: TokenUsage,
+        model_context_window: Option<u64>,
+    ) {
+        self.token_usage_info = Some(TokenUsageInfo {
+            total_token_usage,
+            last_token_usage,
+            model_context_window,
+        });
     }
 
     /// Record the history metadata advertised by `SessionConfiguredEvent` so
@@ -1208,10 +1220,6 @@ impl ChatComposer {
         self.has_focus = has_focus;
     }
 
-    pub fn set_task_running(&mut self, running: bool) {
-        self.is_task_running = running;
-    }
-
     pub(crate) fn set_esc_backtrack_hint(&mut self, show: bool) {
         self.esc_backtrack_hint = show;
     }
@@ -1236,16 +1244,11 @@ impl WidgetRef for ChatComposer {
             ActivePopup::None => {
                 let bottom_line_rect = popup_rect;
                 let mut hint: Vec<Span<'static>> = if self.ctrl_c_quit_hint {
-                    let ctrl_c_followup = if self.is_task_running {
-                        " to interrupt"
-                    } else {
-                        " to quit"
-                    };
                     vec![
                         " ".into(),
                         key_hint::ctrl('C'),
                         " again".into(),
-                        ctrl_c_followup.into(),
+                        " to quit".into(),
                     ]
                 } else {
                     let newline_hint_key = if self.use_shift_enter_hint {
@@ -1277,11 +1280,8 @@ impl WidgetRef for ChatComposer {
                     let token_usage = &token_usage_info.total_token_usage;
                     hint.push("   ".into());
                     hint.push(
-                        Span::from(format!(
-                            "{} tokens used",
-                            format_si_suffix(token_usage.blended_total())
-                        ))
-                        .style(Style::default().add_modifier(Modifier::DIM)),
+                        Span::from(format!("{} tokens used", token_usage.blended_total()))
+                            .style(Style::default().add_modifier(Modifier::DIM)),
                     );
                     let last_token_usage = &token_usage_info.last_token_usage;
                     if let Some(context_window) = token_usage_info.model_context_window {
@@ -1290,16 +1290,11 @@ impl WidgetRef for ChatComposer {
                         } else {
                             100
                         };
-                        let context_style = if percent_remaining < 20 {
-                            Style::default().fg(Color::Yellow)
-                        } else {
-                            Style::default().add_modifier(Modifier::DIM)
-                        };
                         hint.push("   ".into());
-                        hint.push(Span::styled(
-                            format!("{percent_remaining}% context left"),
-                            context_style,
-                        ));
+                        hint.push(
+                            Span::from(format!("{percent_remaining}% context left"))
+                                .style(Style::default().add_modifier(Modifier::DIM)),
+                        );
                     }
                 }