wip

.github/actions/codex/bun.lock

@@ -11,7 +11,7 @@
         "@types/bun": "^1.2.19",
         "@types/node": "^24.1.0",
         "prettier": "^3.6.2",
-        "typescript": "^5.9.2",
+        "typescript": "^5.8.3",
       },
     },
   },
@@ -68,7 +68,7 @@
 
     "tunnel": ["tunnel@0.0.6", "", {}, "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg=="],
 
-    "typescript": ["typescript@5.9.2", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A=="],
+    "typescript": ["typescript@5.8.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-p1diW6TqL9L07nNxvRMM7hMMw4c5XOo/1ibL4aAIGmSAt9slTE1Xgw5KWuof2uTOvCg9BY7ZRi+GaF+7sfgPeQ=="],
 
     "undici": ["undici@5.29.0", "", { "dependencies": { "@fastify/busboy": "^2.0.0" } }, "sha512-raqeBD6NQK4SkWhQzeYKd1KmIG6dllBOTt55Rmkt4HtI9mwdWtJljnrXjAFUBLTSN67HWrOIZ3EPF4kjUw80Bg=="],
 

.github/actions/codex/package.json

@@ -16,6 +16,6 @@
         "@types/bun": "^1.2.19",
         "@types/node": "^24.1.0",
         "prettier": "^3.6.2",
-        "typescript": "^5.9.2"
+        "typescript": "^5.8.3"
     }
 }

codex-rs/Cargo.lock

@@ -661,7 +661,7 @@ dependencies = [
  "clap",
  "codex-core",
  "serde",
- "toml 0.9.4",
+ "toml 0.9.2",
 ]
 
 [[package]]
@@ -699,7 +699,6 @@ dependencies = [
  "serde_json",
  "sha1",
  "shlex",
- "similar",
  "strum_macros 0.27.2",
  "tempfile",
  "thiserror 2.0.12",
@@ -707,7 +706,7 @@ dependencies = [
  "tokio",
  "tokio-test",
  "tokio-util",
- "toml 0.9.4",
+ "toml 0.9.2",
  "tracing",
  "tree-sitter",
  "tree-sitter-bash",
@@ -831,7 +830,7 @@ dependencies = [
  "tempfile",
  "tokio",
  "tokio-test",
- "toml 0.9.4",
+ "toml 0.9.2",
  "tracing",
  "tracing-subscriber",
  "uuid",
@@ -881,7 +880,6 @@ dependencies = [
  "unicode-segmentation",
  "unicode-width 0.1.14",
  "uuid",
- "vt100",
 ]
 
 [[package]]
@@ -1474,7 +1472,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "778e2ac28f6c47af28e4907f13ffd1e1ddbd400980a9abd7c8df189bf578a5ad"
 dependencies = [
  "libc",
- "windows-sys 0.52.0",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -1554,7 +1552,7 @@ checksum = "0ce92ff622d6dadf7349484f42c93271a0d49b7cc4d466a936405bacbe10aa78"
 dependencies = [
  "cfg-if",
  "rustix 1.0.8",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -1757,7 +1755,7 @@ version = "0.2.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cba6ae63eb948698e300f645f87c70f76630d505f23b8907cf1e193ee85048c1"
 dependencies = [
- "unicode-width 0.2.1",
+ "unicode-width 0.2.0",
 ]
 
 [[package]]
@@ -2018,7 +2016,7 @@ dependencies = [
  "libc",
  "percent-encoding",
  "pin-project-lite",
- "socket2",
+ "socket2 0.6.0",
  "system-configuration",
  "tokio",
  "tower-service",
@@ -2337,7 +2335,7 @@ checksum = "e04d7f318608d35d4b61ddd75cbdaee86b023ebe2bd5a66ee0915f0bf93095a9"
 dependencies = [
  "hermit-abi",
  "libc",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -3393,7 +3391,7 @@ dependencies = [
 [[package]]
 name = "ratatui"
 version = "0.29.0"
-source = "git+https://github.com/nornagon/ratatui?branch=nornagon-v0.29.0-patch#9b2ad1298408c45918ee9f8241a6f95498cdbed2"
+source = "git+https://github.com/nornagon/ratatui?branch=nornagon-v0.29.0-patch#bca287ddc5d38fe088c79e2eda22422b96226f2e"
 dependencies = [
  "bitflags 2.9.1",
  "cassowary",
@@ -3407,7 +3405,7 @@ dependencies = [
  "strum 0.26.3",
  "unicode-segmentation",
  "unicode-truncate",
- "unicode-width 0.2.1",
+ "unicode-width 0.2.0",
 ]
 
 [[package]]
@@ -3721,7 +3719,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys 0.4.15",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -3734,7 +3732,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys 0.9.4",
- "windows-sys 0.52.0",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -3998,9 +3996,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.142"
+version = "1.0.141"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "030fedb782600dcbd6f02d479bf0d817ac3bb40d644745b769d6a96bc3afc5a7"
+checksum = "30b9eff21ebe718216c6ec64e1d9ac57087aad11efc64e32002bce4a0d4c03d3"
 dependencies = [
  "indexmap 2.10.0",
  "itoa",
@@ -4189,6 +4187,16 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7c388c1b5e93756d0c740965c41e8822f866621d41acbdf6336a6a168f8840c"
 
+[[package]]
+name = "socket2"
+version = "0.5.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e22376abed350d73dd1cd119b57ffccad95b4e585a7cda43e286245ce23c0678"
+dependencies = [
+ "libc",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "socket2"
 version = "0.6.0"
@@ -4500,7 +4508,7 @@ dependencies = [
  "getrandom 0.3.3",
  "once_cell",
  "rustix 1.0.8",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -4547,7 +4555,7 @@ checksum = "c13547615a44dc9c452a8a534638acdf07120d4b6847c8178705da06306a3057"
 dependencies = [
  "smawk",
  "unicode-linebreak",
- "unicode-width 0.2.1",
+ "unicode-width 0.2.0",
 ]
 
 [[package]]
@@ -4664,9 +4672,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.47.1"
+version = "1.46.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89e49afdadebb872d3145a5638b59eb0691ea23e46ca484037cfab3b76b95038"
+checksum = "0cc3a2344dafbe23a245241fe8b09735b521110d30fcefbbd5feb1797ca35d17"
 dependencies = [
  "backtrace",
  "bytes",
@@ -4677,9 +4685,9 @@ dependencies = [
  "pin-project-lite",
  "signal-hook-registry",
  "slab",
- "socket2",
+ "socket2 0.5.10",
  "tokio-macros",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -4764,9 +4772,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.9.4"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41ae868b5a0f67631c14589f7e250c1ea2c574ee5ba21c6c8dd4b1485705a5a1"
+checksum = "ed0aee96c12fa71097902e0bb061a5e1ebd766a6636bb605ba401c45c1650eac"
 dependencies = [
  "indexmap 2.10.0",
  "serde",
@@ -4995,7 +5003,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "911e93158bf80bbc94bad533b2b16e3d711e1132d69a6a6980c3920a63422c19"
 dependencies = [
  "ratatui",
- "unicode-width 0.2.1",
+ "unicode-width 0.2.0",
 ]
 
 [[package]]
@@ -5063,9 +5071,9 @@ checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
 
 [[package]]
 name = "unicode-width"
-version = "0.2.1"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a1a07cc7db3810833284e8d372ccdc6da29741639ecc70c9ec107df0fa6154c"
+checksum = "1fc81956842c57dac11422a97c3b8195a1ff727f06e85c84ed2e8aa277c9a0fd"
 
 [[package]]
 name = "unicode-xid"
@@ -5150,27 +5158,6 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
-[[package]]
-name = "vt100"
-version = "0.16.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "054ff75fb8fa83e609e685106df4faeffdf3a735d3c74ebce97ec557d5d36fd9"
-dependencies = [
- "itoa",
- "unicode-width 0.2.1",
- "vte",
-]
-
-[[package]]
-name = "vte"
-version = "0.15.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5924018406ce0063cd67f8e008104968b74b563ee1b85dde3ed1f7cb87d3dbd"
-dependencies = [
- "arrayvec",
- "memchr",
-]
-
 [[package]]
 name = "wait-timeout"
 version = "0.2.1"
@@ -5359,7 +5346,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
 dependencies = [
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]

codex-rs/core/Cargo.toml

@@ -34,7 +34,6 @@ serde_json = "1"
 serde_bytes = "0.11"
 sha1 = "0.10.6"
 shlex = "1.3.0"
-similar = "2.7.0"
 strum_macros = "0.27.2"
 thiserror = "2.0.12"
 time = { version = "0.3", features = ["formatting", "local-offset", "macros"] }
@@ -46,7 +45,7 @@ tokio = { version = "1", features = [
     "signal",
 ] }
 tokio-util = "0.7.14"
-toml = "0.9.4"
+toml = "0.9.2"
 tracing = { version = "0.1.41", features = ["log"] }
 tree-sitter = "0.25.8"
 tree-sitter-bash = "0.25.0"

codex-rs/core/prompt.md

@@ -9,10 +9,8 @@ You MUST adhere to the following criteria when executing the task:
 - Analyzing code for vulnerabilities is allowed.
 - Showing user code and tool call details is allowed.
 - User instructions may overwrite the _CODING GUIDELINES_ section in this developer message.
-- `user_instructions` are not part of the user's request, but guidance for how to complete the task.
-- Do not cite `user_instructions` back to the user unless a specific piece is relevant.
 - Do not use \`ls -R\`, \`find\`, or \`grep\` - these are slow in large repos. Use \`rg\` and \`rg --files\`.
-- Use \`apply_patch\` to edit files: {"command":["apply_patch","*** Begin Patch\\n*** Update File: path/to/file.py\\n@@ def example():\\n- pass\\n+ return 123\\n*** End Patch"]}
+- Use \`apply_patch\` to edit files: {"cmd":["apply_patch","*** Begin Patch\\n*** Update File: path/to/file.py\\n@@ def example():\\n- pass\\n+ return 123\\n*** End Patch"]}
 - If completing the user's task requires writing or modifying files:
   - Your code and final answer should follow these _CODING GUIDELINES_:
     - Fix the problem at the root cause rather than applying surface-level patches, when possible.
@@ -42,16 +40,16 @@ You MUST adhere to the following criteria when executing the task:
 
 Your patch language is a stripped‑down, file‑oriented diff format designed to be easy to parse and safe to apply. You can think of it as a high‑level envelope:
 
-*** Begin Patch
+**_ Begin Patch
 [ one or more file sections ]
-*** End Patch
+_** End Patch
 
 Within that envelope, you get a sequence of file operations.
 You MUST include a header to specify the action you are taking.
 Each operation starts with one of three headers:
 
-*** Add File: <path> - create a new file. Every following line is a + line (the initial contents).
-*** Delete File: <path> - remove an existing file. Nothing follows.
+**_ Add File: <path> - create a new file. Every following line is a + line (the initial contents).
+_** Delete File: <path> - remove an existing file. Nothing follows.
 \*\*\* Update File: <path> - patch an existing file in place (optionally with a rename).
 
 May be immediately followed by \*\*\* Move to: <new path> if you want to rename the file.
@@ -65,28 +63,28 @@ Within a hunk each line starts with:
   At the end of a truncated hunk you can emit \*\*\* End of File.
 
 Patch := Begin { FileOp } End
-Begin := "*** Begin Patch" NEWLINE
-End := "*** End Patch" NEWLINE
+Begin := "**_ Begin Patch" NEWLINE
+End := "_** End Patch" NEWLINE
 FileOp := AddFile | DeleteFile | UpdateFile
-AddFile := "*** Add File: " path NEWLINE { "+" line NEWLINE }
-DeleteFile := "*** Delete File: " path NEWLINE
-UpdateFile := "*** Update File: " path NEWLINE [ MoveTo ] { Hunk }
-MoveTo := "*** Move to: " newPath NEWLINE
+AddFile := "**_ Add File: " path NEWLINE { "+" line NEWLINE }
+DeleteFile := "_** Delete File: " path NEWLINE
+UpdateFile := "**_ Update File: " path NEWLINE [ MoveTo ] { Hunk }
+MoveTo := "_** Move to: " newPath NEWLINE
 Hunk := "@@" [ header ] NEWLINE { HunkLine } [ "*** End of File" NEWLINE ]
 HunkLine := (" " | "-" | "+") text NEWLINE
 
 A full patch can combine several operations:
 
-*** Begin Patch
-*** Add File: hello.txt
+**_ Begin Patch
+_** Add File: hello.txt
 +Hello world
-*** Update File: src/app.py
-*** Move to: src/main.py
+**_ Update File: src/app.py
+_** Move to: src/main.py
 @@ def greet():
 -print("Hi")
 +print("Hello, world!")
-*** Delete File: obsolete.txt
-*** End Patch
+**_ Delete File: obsolete.txt
+_** End Patch
 
 It is important to remember:
 
@@ -103,7 +101,7 @@ Plan updates
 
 A tool named `update_plan` is available. Use it to keep an up‑to‑date, step‑by‑step plan for the task so you can follow your progress. When making your plans, keep in mind that you are a deployed coding agent - `update_plan` calls should not involve doing anything that you aren't capable of doing. For example, `update_plan` calls should NEVER contain tasks to merge your own pull requests. Only stop to ask the user if you genuinely need their feedback on a change.
 
-- At the start of any nontrivial task, call `update_plan` with an initial plan: a short list of 1‑sentence steps with a `status` for each step (`pending`, `in_progress`, or `completed`). There should always be exactly one `in_progress` step until everything is done.
+- At the start of the task, call `update_plan` with an initial plan: a short list of 1‑sentence steps with a `status` for each step (`pending`, `in_progress`, or `completed`). There should always be exactly one `in_progress` step until everything is done.
 - Whenever you finish a step, call `update_plan` again, marking the finished step as `completed` and the next step as `in_progress`.
 - If your plan needs to change, call `update_plan` with the revised steps and include an `explanation` describing the change.
 - When all steps are complete, make a final `update_plan` call with all steps marked `completed`.

codex-rs/core/src/chat_completions.rs

@@ -40,7 +40,7 @@ pub(crate) async fn stream_chat_completions(
     let full_instructions = prompt.get_full_instructions(model);
     messages.push(json!({"role": "system", "content": full_instructions}));
 
-    if let Some(instr) = &prompt.get_formatted_user_instructions() {
+    if let Some(instr) = &prompt.user_instructions {
         messages.push(json!({"role": "user", "content": instr}));
     }
 
@@ -120,7 +120,7 @@ pub(crate) async fn stream_chat_completions(
 
     debug!(
         "POST to {}: {}",
-        provider.get_full_url(&None),
+        provider.get_full_url(),
         serde_json::to_string_pretty(&payload).unwrap_or_default()
     );
 
@@ -129,7 +129,7 @@ pub(crate) async fn stream_chat_completions(
     loop {
         attempt += 1;
 
-        let req_builder = provider.create_request_builder(client, &None).await?;
+        let req_builder = provider.create_request_builder(client)?;
 
         let res = req_builder
             .header(reqwest::header::ACCEPT, "text/event-stream")
@@ -260,11 +260,6 @@ async fn process_chat_sse<S>(
                 .and_then(|d| d.get("content"))
                 .and_then(|c| c.as_str())
             {
-                // Emit a delta so downstream consumers can stream text live.
-                let _ = tx_event
-                    .send(Ok(ResponseEvent::OutputTextDelta(content.to_string())))
-                    .await;
-
                 let item = ResponseItem::Message {
                     role: "assistant".to_string(),
                     content: vec![ContentItem::OutputText {
@@ -444,14 +439,11 @@ where
                     // will never appear in a Chat Completions stream.
                     continue;
                 }
-                Poll::Ready(Some(Ok(ResponseEvent::OutputTextDelta(delta)))) => {
-                    // Forward deltas unchanged so callers can stream text
-                    // live while still receiving a single aggregated
-                    // OutputItemDone at the end of the turn.
-                    return Poll::Ready(Some(Ok(ResponseEvent::OutputTextDelta(delta))));
-                }
-                Poll::Ready(Some(Ok(ResponseEvent::ReasoningSummaryDelta(delta)))) => {
-                    return Poll::Ready(Some(Ok(ResponseEvent::ReasoningSummaryDelta(delta))));
+                Poll::Ready(Some(Ok(ResponseEvent::OutputTextDelta(_))))
+                | Poll::Ready(Some(Ok(ResponseEvent::ReasoningSummaryDelta(_)))) => {
+                    // Deltas are ignored here since aggregation waits for the
+                    // final OutputItemDone.
+                    continue;
                 }
             }
         }

codex-rs/core/src/client.rs

@@ -30,6 +30,7 @@ use crate::config::Config;
 use crate::config_types::ReasoningEffort as ReasoningEffortConfig;
 use crate::config_types::ReasoningSummary as ReasoningSummaryConfig;
 use crate::error::CodexErr;
+use crate::error::EnvVarError;
 use crate::error::Result;
 use crate::flags::CODEX_RS_SSE_FIXTURE;
 use crate::model_provider_info::ModelProviderInfo;
@@ -121,11 +122,24 @@ impl ModelClient {
             return stream_from_fixture(path, self.provider.clone()).await;
         }
 
-        let auth = self.auth.clone();
+        let auth = self.auth.as_ref().ok_or_else(|| {
+            CodexErr::EnvVar(EnvVarError {
+                var: "OPENAI_API_KEY".to_string(),
+                instructions: Some("Create an API key (https://platform.openai.com) and export it as an environment variable.".to_string()),
+            })
+        })?;
 
-        let auth_mode = auth.as_ref().map(|a| a.mode);
+        let store = prompt.store && auth.mode != AuthMode::ChatGPT;
 
-        let store = prompt.store && auth_mode != Some(AuthMode::ChatGPT);
+        let base_url = match self.provider.base_url.clone() {
+            Some(url) => url,
+            None => match auth.mode {
+                AuthMode::ChatGPT => "https://chatgpt.com/backend-api/codex".to_string(),
+                AuthMode::ApiKey => "https://api.openai.com/v1".to_string(),
+            },
+        };
+
+        let token = auth.get_token().await?;
 
         let full_instructions = prompt.get_full_instructions(&self.config.model);
         let tools_json = create_tools_json_for_responses_api(
@@ -144,11 +158,11 @@ impl ModelClient {
         };
 
         let mut input_with_instructions = Vec::with_capacity(prompt.input.len() + 1);
-        if let Some(ui) = prompt.get_formatted_user_instructions() {
+        if let Some(ui) = &prompt.user_instructions {
             input_with_instructions.push(ResponseItem::Message {
                 id: None,
                 role: "user".to_string(),
-                content: vec![ContentItem::InputText { text: ui }],
+                content: vec![ContentItem::InputText { text: ui.clone() }],
             });
         }
         input_with_instructions.extend(prompt.input.clone());
@@ -166,36 +180,35 @@ impl ModelClient {
             include,
         };
 
-        let mut attempt = 0;
-        let max_retries = self.provider.request_max_retries();
-
         trace!(
             "POST to {}: {}",
-            self.provider.get_full_url(&auth),
+            self.provider.get_full_url(),
             serde_json::to_string(&payload)?
         );
 
+        let mut attempt = 0;
+        let max_retries = self.provider.request_max_retries();
+
         loop {
             attempt += 1;
 
             let mut req_builder = self
-                .provider
-                .create_request_builder(&self.client, &auth)
-                .await?;
-
-            req_builder = req_builder
+                .client
+                .post(format!("{base_url}/responses"))
                 .header("OpenAI-Beta", "responses=experimental")
                 .header("session_id", self.session_id.to_string())
+                .bearer_auth(&token)
                 .header(reqwest::header::ACCEPT, "text/event-stream")
                 .json(&payload);
 
-            if let Some(auth) = auth.as_ref()
-                && auth.mode == AuthMode::ChatGPT
-                && let Some(account_id) = auth.get_account_id().await
-            {
-                req_builder = req_builder.header("chatgpt-account-id", account_id);
+            if auth.mode == AuthMode::ChatGPT {
+                if let Some(account_id) = auth.get_account_id().await {
+                    req_builder = req_builder.header("chatgpt-account-id", account_id);
+                }
             }
 
+            req_builder = self.provider.apply_http_headers(req_builder);
+
             let originator = self
                 .config
                 .internal_originator

codex-rs/core/src/client_common.rs

@@ -17,10 +17,6 @@ use tokio::sync::mpsc;
 /// with this content.
 const BASE_INSTRUCTIONS: &str = include_str!("../prompt.md");
 
-/// wraps user instructions message in a tag for the model to parse more easily.
-const USER_INSTRUCTIONS_START: &str = "<user_instructions>\n\n";
-const USER_INSTRUCTIONS_END: &str = "\n\n</user_instructions>";
-
 /// API request payload for a single model turn.
 #[derive(Default, Debug, Clone)]
 pub struct Prompt {
@@ -53,12 +49,6 @@ impl Prompt {
         }
         Cow::Owned(sections.join("\n"))
     }
-
-    pub(crate) fn get_formatted_user_instructions(&self) -> Option<String> {
-        self.user_instructions
-            .as_ref()
-            .map(|ui| format!("{USER_INSTRUCTIONS_START}{ui}{USER_INSTRUCTIONS_END}"))
-    }
 }
 
 #[derive(Debug)]

codex-rs/core/src/codex.rs

@@ -85,13 +85,11 @@ use crate::protocol::SandboxPolicy;
 use crate::protocol::SessionConfiguredEvent;
 use crate::protocol::Submission;
 use crate::protocol::TaskCompleteEvent;
-use crate::protocol::TurnDiffEvent;
 use crate::rollout::RolloutRecorder;
 use crate::safety::SafetyCheck;
 use crate::safety::assess_command_safety;
 use crate::safety::assess_safety_for_untrusted_command;
 use crate::shell;
-use crate::turn_diff_tracker::TurnDiffTracker;
 use crate::user_notification::UserNotification;
 use crate::util::backoff;
 
@@ -123,7 +121,7 @@ impl Codex {
         let resume_path = config.experimental_resume.clone();
         info!("resume_path: {resume_path:?}");
         let (tx_sub, rx_sub) = async_channel::bounded(64);
-        let (tx_event, rx_event) = async_channel::unbounded();
+        let (tx_event, rx_event) = async_channel::bounded(1600);
 
         let user_instructions = get_user_instructions(&config).await;
 
@@ -364,11 +362,7 @@ impl Session {
         }
     }
 
-    async fn on_exec_command_begin(
-        &self,
-        turn_diff_tracker: &mut TurnDiffTracker,
-        exec_command_context: ExecCommandContext,
-    ) {
+    async fn notify_exec_command_begin(&self, exec_command_context: ExecCommandContext) {
         let ExecCommandContext {
             sub_id,
             call_id,
@@ -380,15 +374,11 @@ impl Session {
             Some(ApplyPatchCommandContext {
                 user_explicitly_approved_this_action,
                 changes,
-            }) => {
-                turn_diff_tracker.on_patch_begin(&changes);
-
-                EventMsg::PatchApplyBegin(PatchApplyBeginEvent {
-                    call_id,
-                    auto_approved: !user_explicitly_approved_this_action,
-                    changes,
-                })
-            }
+            }) => EventMsg::PatchApplyBegin(PatchApplyBeginEvent {
+                call_id,
+                auto_approved: !user_explicitly_approved_this_action,
+                changes,
+            }),
             None => EventMsg::ExecCommandBegin(ExecCommandBeginEvent {
                 call_id,
                 command: command_for_display.clone(),
@@ -402,10 +392,8 @@ impl Session {
         let _ = self.tx_event.send(event).await;
     }
 
-    #[allow(clippy::too_many_arguments)]
-    async fn on_exec_command_end(
+    async fn notify_exec_command_end(
         &self,
-        turn_diff_tracker: &mut TurnDiffTracker,
         sub_id: &str,
         call_id: &str,
         output: &ExecToolCallOutput,
@@ -445,20 +433,6 @@ impl Session {
             msg,
         };
         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.
-        if is_apply_patch {
-            let unified_diff = turn_diff_tracker.get_unified_diff();
-            if let Ok(Some(unified_diff)) = unified_diff {
-                let msg = EventMsg::TurnDiff(TurnDiffEvent { unified_diff });
-                let event = Event {
-                    id: sub_id.into(),
-                    msg,
-                };
-                let _ = self.tx_event.send(event).await;
-            }
-        }
     }
 
     /// Helper that emits a BackgroundEvent with the given message. This keeps
@@ -701,7 +675,7 @@ async fn submission_loop(
                 cwd,
                 resume_path,
             } => {
-                debug!(
+                info!(
                     "Configuring session: model={model}; provider={provider:?}; resume={resume_path:?}"
                 );
                 if !cwd.is_absolute() {
@@ -1032,10 +1006,6 @@ async fn run_task(sess: Arc<Session>, sub_id: String, input: Vec<InputItem>) {
         .await;
 
     let last_agent_message: Option<String>;
-    // Although from the perspective of codex.rs, TurnDiffTracker has the lifecycle of a Task which contains
-    // many turns, from the perspective of the user, it is a single turn.
-    let mut turn_diff_tracker = TurnDiffTracker::new();
-
     loop {
         // Note that pending_input would be something like a message the user
         // submitted through the UI while the model was running. Though the UI
@@ -1067,7 +1037,7 @@ async fn run_task(sess: Arc<Session>, sub_id: String, input: Vec<InputItem>) {
                 })
             })
             .collect();
-        match run_turn(&sess, &mut turn_diff_tracker, sub_id.clone(), turn_input).await {
+        match run_turn(&sess, sub_id.clone(), turn_input).await {
             Ok(turn_output) => {
                 let mut items_to_record_in_conversation_history = Vec::<ResponseItem>::new();
                 let mut responses = Vec::<ResponseInputItem>::new();
@@ -1193,7 +1163,6 @@ async fn run_task(sess: Arc<Session>, sub_id: String, input: Vec<InputItem>) {
 
 async fn run_turn(
     sess: &Session,
-    turn_diff_tracker: &mut TurnDiffTracker,
     sub_id: String,
     input: Vec<ResponseItem>,
 ) -> CodexResult<Vec<ProcessedResponseItem>> {
@@ -1208,7 +1177,7 @@ async fn run_turn(
 
     let mut retries = 0;
     loop {
-        match try_run_turn(sess, turn_diff_tracker, &sub_id, &prompt).await {
+        match try_run_turn(sess, &sub_id, &prompt).await {
             Ok(output) => return Ok(output),
             Err(CodexErr::Interrupted) => return Err(CodexErr::Interrupted),
             Err(CodexErr::EnvVar(var)) => return Err(CodexErr::EnvVar(var)),
@@ -1254,7 +1223,6 @@ struct ProcessedResponseItem {
 
 async fn try_run_turn(
     sess: &Session,
-    turn_diff_tracker: &mut TurnDiffTracker,
     sub_id: &str,
     prompt: &Prompt,
 ) -> CodexResult<Vec<ProcessedResponseItem>> {
@@ -1342,8 +1310,7 @@ async fn try_run_turn(
         match event {
             ResponseEvent::Created => {}
             ResponseEvent::OutputItemDone(item) => {
-                let response =
-                    handle_response_item(sess, turn_diff_tracker, sub_id, item.clone()).await?;
+                let response = handle_response_item(sess, sub_id, item.clone()).await?;
 
                 output.push(ProcessedResponseItem { item, response });
             }
@@ -1361,24 +1328,9 @@ async fn try_run_turn(
                         .ok();
                 }
 
-                let unified_diff = turn_diff_tracker.get_unified_diff();
-                if let Ok(Some(unified_diff)) = unified_diff {
-                    let msg = EventMsg::TurnDiff(TurnDiffEvent { unified_diff });
-                    let event = Event {
-                        id: sub_id.to_string(),
-                        msg,
-                    };
-                    let _ = sess.tx_event.send(event).await;
-                }
-
                 return Ok(output);
             }
             ResponseEvent::OutputTextDelta(delta) => {
-                {
-                    let mut st = sess.state.lock().unwrap();
-                    st.history.append_assistant_text(&delta);
-                }
-
                 let event = Event {
                     id: sub_id.to_string(),
                     msg: EventMsg::AgentMessageDelta(AgentMessageDeltaEvent { delta }),
@@ -1480,7 +1432,6 @@ async fn run_compact_task(
 
 async fn handle_response_item(
     sess: &Session,
-    turn_diff_tracker: &mut TurnDiffTracker,
     sub_id: &str,
     item: ResponseItem,
 ) -> CodexResult<Option<ResponseInputItem>> {
@@ -1518,17 +1469,7 @@ async fn handle_response_item(
             ..
         } => {
             info!("FunctionCall: {arguments}");
-            Some(
-                handle_function_call(
-                    sess,
-                    turn_diff_tracker,
-                    sub_id.to_string(),
-                    name,
-                    arguments,
-                    call_id,
-                )
-                .await,
-            )
+            Some(handle_function_call(sess, sub_id.to_string(), name, arguments, call_id).await)
         }
         ResponseItem::LocalShellCall {
             id,
@@ -1563,7 +1504,6 @@ async fn handle_response_item(
                 handle_container_exec_with_params(
                     exec_params,
                     sess,
-                    turn_diff_tracker,
                     sub_id.to_string(),
                     effective_call_id,
                 )
@@ -1581,7 +1521,6 @@ async fn handle_response_item(
 
 async fn handle_function_call(
     sess: &Session,
-    turn_diff_tracker: &mut TurnDiffTracker,
     sub_id: String,
     name: String,
     arguments: String,
@@ -1595,8 +1534,7 @@ async fn handle_function_call(
                     return *output;
                 }
             };
-            handle_container_exec_with_params(params, sess, turn_diff_tracker, sub_id, call_id)
-                .await
+            handle_container_exec_with_params(params, sess, sub_id, call_id).await
         }
         "update_plan" => handle_update_plan(sess, arguments, sub_id, call_id).await,
         _ => {
@@ -1670,7 +1608,6 @@ fn maybe_run_with_user_profile(params: ExecParams, sess: &Session) -> ExecParams
 async fn handle_container_exec_with_params(
     params: ExecParams,
     sess: &Session,
-    turn_diff_tracker: &mut TurnDiffTracker,
     sub_id: String,
     call_id: String,
 ) -> ResponseInputItem {
@@ -1818,7 +1755,7 @@ async fn handle_container_exec_with_params(
             },
         ),
     };
-    sess.on_exec_command_begin(turn_diff_tracker, exec_command_context.clone())
+    sess.notify_exec_command_begin(exec_command_context.clone())
         .await;
 
     let params = maybe_run_with_user_profile(params, sess);
@@ -1845,8 +1782,7 @@ async fn handle_container_exec_with_params(
                 duration,
             } = &output;
 
-            sess.on_exec_command_end(
-                turn_diff_tracker,
+            sess.notify_exec_command_end(
                 &sub_id,
                 &call_id,
                 &output,
@@ -1870,15 +1806,7 @@ async fn handle_container_exec_with_params(
             }
         }
         Err(CodexErr::Sandbox(error)) => {
-            handle_sandbox_error(
-                turn_diff_tracker,
-                params,
-                exec_command_context,
-                error,
-                sandbox_type,
-                sess,
-            )
-            .await
+            handle_sandbox_error(params, exec_command_context, error, sandbox_type, sess).await
         }
         Err(e) => {
             // Handle non-sandbox errors
@@ -1894,7 +1822,6 @@ async fn handle_container_exec_with_params(
 }
 
 async fn handle_sandbox_error(
-    turn_diff_tracker: &mut TurnDiffTracker,
     params: ExecParams,
     exec_command_context: ExecCommandContext,
     error: SandboxErr,
@@ -1926,8 +1853,7 @@ async fn handle_sandbox_error(
     // include additional metadata on the command to indicate whether non-zero
     // exit codes merit a retry.
 
-    // For now, we categorically ask the user to retry without sandbox and
-    // emit the raw error as a background event.
+    // For now, we categorically ask the user to retry without sandbox.
     sess.notify_background_event(&sub_id, format!("Execution failed: {error}"))
         .await;
 
@@ -1952,8 +1878,7 @@ async fn handle_sandbox_error(
             sess.notify_background_event(&sub_id, "retrying command without sandbox")
                 .await;
 
-            sess.on_exec_command_begin(turn_diff_tracker, exec_command_context)
-                .await;
+            sess.notify_exec_command_begin(exec_command_context).await;
 
             // This is an escalated retry; the policy will not be
             // examined and the sandbox has been set to `None`.
@@ -1980,14 +1905,8 @@ async fn handle_sandbox_error(
                         duration,
                     } = &retry_output;
 
-                    sess.on_exec_command_end(
-                        turn_diff_tracker,
-                        &sub_id,
-                        &call_id,
-                        &retry_output,
-                        is_apply_patch,
-                    )
-                    .await;
+                    sess.notify_exec_command_end(&sub_id, &call_id, &retry_output, is_apply_patch)
+                        .await;
 
                     let is_success = *exit_code == 0;
                     let content = format_exec_output(

codex-rs/core/src/config.rs

@@ -480,12 +480,10 @@ impl Config {
         // Load base instructions override from a file if specified. If the
         // path is relative, resolve it against the effective cwd so the
         // behaviour matches other path-like config values.
-        let experimental_instructions_path = config_profile
-            .experimental_instructions_file
-            .as_ref()
-            .or(cfg.experimental_instructions_file.as_ref());
-        let file_base_instructions =
-            Self::get_base_instructions(experimental_instructions_path, &resolved_cwd)?;
+        let file_base_instructions = Self::get_base_instructions(
+            cfg.experimental_instructions_file.as_ref(),
+            &resolved_cwd,
+        )?;
         let base_instructions = base_instructions.or(file_base_instructions);
 
         let config = Self {

codex-rs/core/src/config_profile.rs

@@ -1,5 +1,4 @@
 use serde::Deserialize;
-use std::path::PathBuf;
 
 use crate::config_types::ReasoningEffort;
 use crate::config_types::ReasoningSummary;
@@ -18,5 +17,4 @@ pub struct ConfigProfile {
     pub model_reasoning_effort: Option<ReasoningEffort>,
     pub model_reasoning_summary: Option<ReasoningSummary>,
     pub chatgpt_base_url: Option<String>,
-    pub experimental_instructions_file: Option<PathBuf>,
 }

codex-rs/core/src/conversation_history.rs

@@ -24,52 +24,9 @@ impl ConversationHistory {
         I::Item: std::ops::Deref<Target = ResponseItem>,
     {
         for item in items {
-            if !is_api_message(&item) {
-                continue;
-            }
-
-            // Merge adjacent assistant messages into a single history entry.
-            // This prevents duplicates when a partial assistant message was
-            // streamed into history earlier in the turn and the final full
-            // message is recorded at turn end.
-            match (&*item, self.items.last_mut()) {
-                (
-                    ResponseItem::Message {
-                        role: new_role,
-                        content: new_content,
-                        ..
-                    },
-                    Some(ResponseItem::Message {
-                        role: last_role,
-                        content: last_content,
-                        ..
-                    }),
-                ) if new_role == "assistant" && last_role == "assistant" => {
-                    append_text_content(last_content, new_content);
-                }
-                _ => {
-                    self.items.push(item.clone());
-                }
-            }
-        }
-    }
-
-    /// Append a text `delta` to the latest assistant message, creating a new
-    /// assistant entry if none exists yet (e.g. first delta for this turn).
-    pub(crate) fn append_assistant_text(&mut self, delta: &str) {
-        match self.items.last_mut() {
-            Some(ResponseItem::Message { role, content, .. }) if role == "assistant" => {
-                append_text_delta(content, delta);
-            }
-            _ => {
-                // Start a new assistant message with the delta.
-                self.items.push(ResponseItem::Message {
-                    id: None,
-                    role: "assistant".to_string(),
-                    content: vec![crate::models::ContentItem::OutputText {
-                        text: delta.to_string(),
-                    }],
-                });
+            if is_api_message(&item) {
+                // Note agent-loop.ts also does filtering on some of the fields.
+                self.items.push(item.clone());
             }
         }
     }
@@ -115,140 +72,3 @@ fn is_api_message(message: &ResponseItem) -> bool {
         ResponseItem::Other => false,
     }
 }
-
-/// Helper to append the textual content from `src` into `dst` in place.
-fn append_text_content(
-    dst: &mut Vec<crate::models::ContentItem>,
-    src: &Vec<crate::models::ContentItem>,
-) {
-    for c in src {
-        if let crate::models::ContentItem::OutputText { text } = c {
-            append_text_delta(dst, text);
-        }
-    }
-}
-
-/// Append a single text delta to the last OutputText item in `content`, or
-/// push a new OutputText item if none exists.
-fn append_text_delta(content: &mut Vec<crate::models::ContentItem>, delta: &str) {
-    if let Some(crate::models::ContentItem::OutputText { text }) = content
-        .iter_mut()
-        .rev()
-        .find(|c| matches!(c, crate::models::ContentItem::OutputText { .. }))
-    {
-        text.push_str(delta);
-    } else {
-        content.push(crate::models::ContentItem::OutputText {
-            text: delta.to_string(),
-        });
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::models::ContentItem;
-
-    fn assistant_msg(text: &str) -> ResponseItem {
-        ResponseItem::Message {
-            id: None,
-            role: "assistant".to_string(),
-            content: vec![ContentItem::OutputText {
-                text: text.to_string(),
-            }],
-        }
-    }
-
-    fn user_msg(text: &str) -> ResponseItem {
-        ResponseItem::Message {
-            id: None,
-            role: "user".to_string(),
-            content: vec![ContentItem::OutputText {
-                text: text.to_string(),
-            }],
-        }
-    }
-
-    #[test]
-    fn merges_adjacent_assistant_messages() {
-        let mut h = ConversationHistory::default();
-        let a1 = assistant_msg("Hello");
-        let a2 = assistant_msg(", world!");
-        h.record_items([&a1, &a2]);
-
-        let items = h.contents();
-        assert_eq!(
-            items,
-            vec![ResponseItem::Message {
-                id: None,
-                role: "assistant".to_string(),
-                content: vec![ContentItem::OutputText {
-                    text: "Hello, world!".to_string()
-                }]
-            }]
-        );
-    }
-
-    #[test]
-    fn append_assistant_text_creates_and_appends() {
-        let mut h = ConversationHistory::default();
-        h.append_assistant_text("Hello");
-        h.append_assistant_text(", world");
-
-        // Now record a final full assistant message and verify it merges.
-        let final_msg = assistant_msg("!");
-        h.record_items([&final_msg]);
-
-        let items = h.contents();
-        assert_eq!(
-            items,
-            vec![ResponseItem::Message {
-                id: None,
-                role: "assistant".to_string(),
-                content: vec![ContentItem::OutputText {
-                    text: "Hello, world!".to_string()
-                }]
-            }]
-        );
-    }
-
-    #[test]
-    fn filters_non_api_messages() {
-        let mut h = ConversationHistory::default();
-        // System message is not an API message; Other is ignored.
-        let system = ResponseItem::Message {
-            id: None,
-            role: "system".to_string(),
-            content: vec![ContentItem::OutputText {
-                text: "ignored".to_string(),
-            }],
-        };
-        h.record_items([&system, &ResponseItem::Other]);
-
-        // User and assistant should be retained.
-        let u = user_msg("hi");
-        let a = assistant_msg("hello");
-        h.record_items([&u, &a]);
-
-        let items = h.contents();
-        assert_eq!(
-            items,
-            vec![
-                ResponseItem::Message {
-                    id: None,
-                    role: "user".to_string(),
-                    content: vec![ContentItem::OutputText {
-                        text: "hi".to_string()
-                    }]
-                },
-                ResponseItem::Message {
-                    id: None,
-                    role: "assistant".to_string(),
-                    content: vec![ContentItem::OutputText {
-                        text: "hello".to_string()
-                    }]
-                }
-            ]
-        );
-    }
-}

codex-rs/core/src/exec.rs

@@ -140,7 +140,11 @@ pub async fn process_exec_tool_call(
 
             let exit_code = raw_output.exit_status.code().unwrap_or(-1);
 
-            if exit_code != 0 && is_likely_sandbox_denied(sandbox_type, exit_code) {
+            // NOTE(ragona): This is much less restrictive than the previous check. If we exec
+            // a command, and it returns anything other than success, we assume that it may have
+            // been a sandboxing error and allow the user to retry. (The user of course may choose
+            // not to retry, or in a non-interactive mode, would automatically reject the approval.)
+            if exit_code != 0 && sandbox_type != SandboxType::None {
                 return Err(CodexErr::Sandbox(SandboxErr::Denied(
                     exit_code, stdout, stderr,
                 )));
@@ -219,26 +223,6 @@ fn create_linux_sandbox_command_args(
     linux_cmd
 }
 
-/// We don't have a fully deterministic way to tell if our command failed
-/// because of the sandbox - a command in the user's zshrc file might hit an
-/// error, but the command itself might fail or succeed for other reasons.
-/// For now, we conservatively check for 'command not found' (exit code 127),
-/// and can add additional cases as necessary.
-fn is_likely_sandbox_denied(sandbox_type: SandboxType, exit_code: i32) -> bool {
-    if sandbox_type == SandboxType::None {
-        return false;
-    }
-
-    // Quick rejects: well-known non-sandbox shell exit codes
-    // 127: command not found, 2: misuse of shell builtins
-    if exit_code == 127 {
-        return false;
-    }
-
-    // For all other cases, we assume the sandbox is the cause
-    true
-}
-
 #[derive(Debug)]
 pub struct RawExecToolCallOutput {
     pub exit_status: ExitStatus,

codex-rs/core/src/lib.rs

@@ -38,14 +38,12 @@ pub mod plan_tool;
 mod project_doc;
 pub mod protocol;
 mod rollout;
-pub(crate) mod safety;
+mod safety;
 pub mod seatbelt;
 pub mod shell;
 pub mod spawn;
-pub mod turn_diff_tracker;
 mod user_notification;
 pub mod util;
 
 pub use apply_patch::CODEX_APPLY_PATCH_ARG1;
 pub use client_common::model_supports_reasoning_summaries;
-pub use safety::get_platform_sandbox;

codex-rs/core/src/model_provider_info.rs

@@ -5,11 +5,8 @@
 //!   2. User-defined entries inside `~/.codex/config.toml` under the `model_providers`
 //!      key. These override or extend the defaults at runtime.
 
-use codex_login::AuthMode;
-use codex_login::CodexAuth;
 use serde::Deserialize;
 use serde::Serialize;
-use std::borrow::Cow;
 use std::collections::HashMap;
 use std::env::VarError;
 use std::time::Duration;
@@ -91,30 +88,25 @@ impl ModelProviderInfo {
     /// When `require_api_key` is true and the provider declares an `env_key`
     /// but the variable is missing/empty, returns an [`Err`] identical to the
     /// one produced by [`ModelProviderInfo::api_key`].
-    pub async fn create_request_builder<'a>(
+    pub fn create_request_builder<'a>(
         &'a self,
         client: &'a reqwest::Client,
-        auth: &Option<CodexAuth>,
     ) -> crate::error::Result<reqwest::RequestBuilder> {
-        let auth: Cow<'_, Option<CodexAuth>> = if auth.is_some() {
-            Cow::Borrowed(auth)
-        } else {
-            Cow::Owned(self.get_fallback_auth()?)
-        };
-
-        let url = self.get_full_url(&auth);
+        let url = self.get_full_url();
 
         let mut builder = client.post(url);
 
-        if let Some(auth) = auth.as_ref() {
-            builder = builder.bearer_auth(auth.get_token().await?);
+        let api_key = self.api_key()?;
+        if let Some(key) = api_key {
+            builder = builder.bearer_auth(key);
         }
 
         Ok(self.apply_http_headers(builder))
     }
 
-    fn get_query_string(&self) -> String {
-        self.query_params
+    pub(crate) fn get_full_url(&self) -> String {
+        let query_string = self
+            .query_params
             .as_ref()
             .map_or_else(String::new, |params| {
                 let full_params = params
@@ -123,29 +115,16 @@ impl ModelProviderInfo {
                     .collect::<Vec<_>>()
                     .join("&");
                 format!("?{full_params}")
-            })
-    }
-
-    pub(crate) fn get_full_url(&self, auth: &Option<CodexAuth>) -> String {
-        let default_base_url = if matches!(
-            auth,
-            Some(CodexAuth {
-                mode: AuthMode::ChatGPT,
-                ..
-            })
-        ) {
-            "https://chatgpt.com/backend-api/codex"
-        } else {
-            "https://api.openai.com/v1"
-        };
-        let query_string = self.get_query_string();
+            });
         let base_url = self
             .base_url
             .clone()
-            .unwrap_or(default_base_url.to_string());
+            .unwrap_or("https://api.openai.com/v1".to_string());
 
         match self.wire_api {
-            WireApi::Responses => format!("{base_url}/responses{query_string}"),
+            WireApi::Responses => {
+                format!("{base_url}/responses{query_string}")
+            }
             WireApi::Chat => format!("{base_url}/chat/completions{query_string}"),
         }
     }
@@ -153,7 +132,10 @@ impl ModelProviderInfo {
     /// Apply provider-specific HTTP headers (both static and environment-based)
     /// onto an existing `reqwest::RequestBuilder` and return the updated
     /// builder.
-    fn apply_http_headers(&self, mut builder: reqwest::RequestBuilder) -> reqwest::RequestBuilder {
+    pub fn apply_http_headers(
+        &self,
+        mut builder: reqwest::RequestBuilder,
+    ) -> reqwest::RequestBuilder {
         if let Some(extra) = &self.http_headers {
             for (k, v) in extra {
                 builder = builder.header(k, v);
@@ -175,7 +157,7 @@ impl ModelProviderInfo {
     /// If `env_key` is Some, returns the API key for this provider if present
     /// (and non-empty) in the environment. If `env_key` is required but
     /// cannot be found, returns an error.
-    pub fn api_key(&self) -> crate::error::Result<Option<String>> {
+    fn api_key(&self) -> crate::error::Result<Option<String>> {
         match &self.env_key {
             Some(env_key) => {
                 let env_value = std::env::var(env_key);
@@ -216,14 +198,6 @@ impl ModelProviderInfo {
             .map(Duration::from_millis)
             .unwrap_or(Duration::from_millis(DEFAULT_STREAM_IDLE_TIMEOUT_MS))
     }
-
-    fn get_fallback_auth(&self) -> crate::error::Result<Option<CodexAuth>> {
-        let api_key = self.api_key()?;
-        if let Some(api_key) = api_key {
-            return Ok(Some(CodexAuth::from_api_key(api_key)));
-        }
-        Ok(None)
-    }
 }
 
 /// Built-in default provider list.

codex-rs/core/src/models.rs

@@ -9,7 +9,7 @@ use serde::ser::Serializer;
 
 use crate::protocol::InputItem;
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ResponseInputItem {
     Message {
@@ -26,7 +26,7 @@ pub enum ResponseInputItem {
     },
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ContentItem {
     InputText { text: String },
@@ -34,7 +34,7 @@ pub enum ContentItem {
     OutputText { text: String },
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ResponseItem {
     Message {
@@ -107,7 +107,7 @@ impl From<ResponseInputItem> for ResponseItem {
     }
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum LocalShellStatus {
     Completed,
@@ -115,13 +115,13 @@ pub enum LocalShellStatus {
     Incomplete,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum LocalShellAction {
     Exec(LocalShellExecAction),
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct LocalShellExecAction {
     pub command: Vec<String>,
     pub timeout_ms: Option<u64>,
@@ -130,7 +130,7 @@ pub struct LocalShellExecAction {
     pub user: Option<String>,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ReasoningItemReasoningSummary {
     SummaryText { text: String },
@@ -185,9 +185,10 @@ pub struct ShellToolCallParams {
     pub timeout_ms: Option<u64>,
 }
 
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone)]
 pub struct FunctionCallOutputPayload {
     pub content: String,
+    #[expect(dead_code)]
     pub success: Option<bool>,
 }
 

codex-rs/core/src/protocol.rs

@@ -387,8 +387,6 @@ pub enum EventMsg {
     /// Notification that a patch application has finished.
     PatchApplyEnd(PatchApplyEndEvent),
 
-    TurnDiff(TurnDiffEvent),
-
     /// Response to GetHistoryEntryRequest.
     GetHistoryEntryResponse(GetHistoryEntryResponseEvent),
 
@@ -600,11 +598,6 @@ pub struct PatchApplyEndEvent {
     pub success: bool,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize)]
-pub struct TurnDiffEvent {
-    pub unified_diff: String,
-}
-
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct GetHistoryEntryResponseEvent {
     pub offset: usize,

codex-rs/core/src/turn_diff_tracker.rs

@@ -1,887 +0,0 @@
-use std::collections::HashMap;
-use std::fs;
-use std::path::Path;
-use std::path::PathBuf;
-use std::process::Command;
-
-use anyhow::Context;
-use anyhow::Result;
-use anyhow::anyhow;
-use sha1::digest::Output;
-use uuid::Uuid;
-
-use crate::protocol::FileChange;
-
-const ZERO_OID: &str = "0000000000000000000000000000000000000000";
-const DEV_NULL: &str = "/dev/null";
-
-struct BaselineFileInfo {
-    path: PathBuf,
-    content: Vec<u8>,
-    mode: FileMode,
-    oid: String,
-}
-
-/// Tracks sets of changes to files and exposes the overall unified diff.
-/// Internally, the way this works is now:
-/// 1. Maintain an in-memory baseline snapshot of files when they are first seen.
-///    For new additions, do not create a baseline so that diffs are shown as proper additions (using /dev/null).
-/// 2. Keep a stable internal filename (uuid) per external path for rename tracking.
-/// 3. To compute the aggregated unified diff, compare each baseline snapshot to the current file on disk entirely in-memory
-///    using the `similar` crate and emit unified diffs with rewritten external paths.
-#[derive(Default)]
-pub struct TurnDiffTracker {
-    /// Map external path -> internal filename (uuid).
-    external_to_temp_name: HashMap<PathBuf, String>,
-    /// Internal filename -> baseline file info.
-    baseline_file_info: HashMap<String, BaselineFileInfo>,
-    /// Internal filename -> external path as of current accumulated state (after applying all changes).
-    /// This is where renames are tracked.
-    temp_name_to_current_path: HashMap<String, PathBuf>,
-    /// Cache of known git worktree roots to avoid repeated filesystem walks.
-    git_root_cache: Vec<PathBuf>,
-}
-
-impl TurnDiffTracker {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
-    /// Front-run apply patch calls to track the starting contents of any modified files.
-    /// - Creates an in-memory baseline snapshot for files that already exist on disk when first seen.
-    /// - For additions, we intentionally do not create a baseline snapshot so that diffs are proper additions.
-    /// - Also updates internal mappings for move/rename events.
-    pub fn on_patch_begin(&mut self, changes: &HashMap<PathBuf, FileChange>) {
-        for (path, change) in changes.iter() {
-            // Ensure a stable internal filename exists for this external path.
-            if !self.external_to_temp_name.contains_key(path) {
-                let internal = Uuid::new_v4().to_string();
-                self.external_to_temp_name
-                    .insert(path.clone(), internal.clone());
-                self.temp_name_to_current_path
-                    .insert(internal.clone(), path.clone());
-
-                // If the file exists on disk now, snapshot as baseline; else leave missing to represent /dev/null.
-                let baseline_file_info = if path.exists() {
-                    let mode = file_mode_for_path(path);
-                    let mode_val = mode.unwrap_or(FileMode::Regular);
-                    let content = blob_bytes(path, &mode_val).unwrap_or_default();
-                    let oid = if mode == Some(FileMode::Symlink) {
-                        format!("{:x}", git_blob_sha1_hex_bytes(&content))
-                    } else {
-                        self.git_blob_oid_for_path(path)
-                            .unwrap_or_else(|| format!("{:x}", git_blob_sha1_hex_bytes(&content)))
-                    };
-                    Some(BaselineFileInfo {
-                        path: path.clone(),
-                        content,
-                        mode: mode_val,
-                        oid,
-                    })
-                } else {
-                    Some(BaselineFileInfo {
-                        path: path.clone(),
-                        content: vec![],
-                        mode: FileMode::Regular,
-                        oid: ZERO_OID.to_string(),
-                    })
-                };
-
-                if let Some(baseline_file_info) = baseline_file_info {
-                    self.baseline_file_info
-                        .insert(internal.clone(), baseline_file_info);
-                }
-            }
-
-            // Track rename/move in current mapping if provided in an Update.
-            if let FileChange::Update {
-                move_path: Some(dest),
-                ..
-            } = change
-            {
-                let uuid_filename = match self.external_to_temp_name.get(path) {
-                    Some(i) => i.clone(),
-                    None => {
-                        // This should be rare, but if we haven't mapped the source, create it with no baseline.
-                        let i = Uuid::new_v4().to_string();
-                        self.baseline_file_info.insert(
-                            i.clone(),
-                            BaselineFileInfo {
-                                path: path.clone(),
-                                content: vec![],
-                                mode: FileMode::Regular,
-                                oid: ZERO_OID.to_string(),
-                            },
-                        );
-                        i
-                    }
-                };
-                // Update current external mapping for temp file name.
-                self.temp_name_to_current_path
-                    .insert(uuid_filename.clone(), dest.clone());
-                // Update forward file_mapping: external current -> internal name.
-                self.external_to_temp_name.remove(path);
-                self.external_to_temp_name
-                    .insert(dest.clone(), uuid_filename);
-            };
-        }
-    }
-
-    fn get_path_for_internal(&self, internal: &str) -> Option<PathBuf> {
-        self.temp_name_to_current_path
-            .get(internal)
-            .cloned()
-            .or_else(|| {
-                self.baseline_file_info
-                    .get(internal)
-                    .map(|info| info.path.clone())
-            })
-    }
-
-    /// Find the git worktree root for a file/directory by walking up to the first ancestor containing a `.git` entry.
-    /// Uses a simple cache of known roots and avoids negative-result caching for simplicity.
-    fn find_git_root_cached(&mut self, start: &Path) -> Option<PathBuf> {
-        let dir = if start.is_dir() {
-            start
-        } else {
-            start.parent()?
-        };
-
-        // Fast path: if any cached root is an ancestor of this path, use it.
-        if let Some(root) = self
-            .git_root_cache
-            .iter()
-            .find(|r| dir.starts_with(r))
-            .cloned()
-        {
-            return Some(root);
-        }
-
-        // Walk up to find a `.git` marker.
-        let mut cur = dir.to_path_buf();
-        loop {
-            let git_marker = cur.join(".git");
-            if git_marker.is_dir() || git_marker.is_file() {
-                if !self.git_root_cache.iter().any(|r| r == &cur) {
-                    self.git_root_cache.push(cur.clone());
-                }
-                return Some(cur);
-            }
-
-            // On Windows, avoid walking above the drive or UNC share root.
-            #[cfg(windows)]
-            {
-                if is_windows_drive_or_unc_root(&cur) {
-                    return None;
-                }
-            }
-
-            if let Some(parent) = cur.parent() {
-                cur = parent.to_path_buf();
-            } else {
-                return None;
-            }
-        }
-    }
-
-    /// Return a display string for `path` relative to its git root if found, else absolute.
-    fn relative_to_git_root_str(&mut self, path: &Path) -> String {
-        let s = if let Some(root) = self.find_git_root_cached(path) {
-            if let Ok(rel) = path.strip_prefix(&root) {
-                rel.display().to_string()
-            } else {
-                path.display().to_string()
-            }
-        } else {
-            path.display().to_string()
-        };
-        s.replace('\\', "/")
-    }
-
-    /// Ask git to compute the blob SHA-1 for the file at `path` within its repository.
-    /// Returns None if no repository is found or git invocation fails.
-    fn git_blob_oid_for_path(&mut self, path: &Path) -> Option<String> {
-        let root = self.find_git_root_cached(path)?;
-        // Compute a path relative to the repo root for better portability across platforms.
-        let rel = path.strip_prefix(&root).unwrap_or(path);
-        let output = Command::new("git")
-            .arg("-C")
-            .arg(&root)
-            .arg("hash-object")
-            .arg("--")
-            .arg(rel)
-            .output()
-            .ok()?;
-        if !output.status.success() {
-            return None;
-        }
-        let s = String::from_utf8_lossy(&output.stdout).trim().to_string();
-        if s.len() == 40 { Some(s) } else { None }
-    }
-
-    /// Recompute the aggregated unified diff by comparing all of the in-memory snapshots that were
-    /// collected before the first time they were touched by apply_patch during this turn with
-    /// the current repo state.
-    pub fn get_unified_diff(&mut self) -> Result<Option<String>> {
-        let mut aggregated = String::new();
-
-        // Compute diffs per tracked internal file in a stable order by external path.
-        let mut baseline_file_names: Vec<String> =
-            self.baseline_file_info.keys().cloned().collect();
-        // Sort lexicographically by full repo-relative path to match git behavior.
-        baseline_file_names.sort_by_key(|internal| {
-            self.get_path_for_internal(internal)
-                .map(|p| self.relative_to_git_root_str(&p))
-                .unwrap_or_default()
-        });
-
-        for internal in baseline_file_names {
-            aggregated.push_str(self.get_file_diff(&internal).as_str());
-            if !aggregated.ends_with('\n') {
-                aggregated.push('\n');
-            }
-        }
-
-        if aggregated.trim().is_empty() {
-            Ok(None)
-        } else {
-            Ok(Some(aggregated))
-        }
-    }
-
-    fn get_file_diff(&mut self, internal_file_name: &str) -> String {
-        let mut aggregated = String::new();
-
-        // Snapshot lightweight fields only.
-        let (baseline_external_path, baseline_mode, left_oid) = {
-            if let Some(info) = self.baseline_file_info.get(internal_file_name) {
-                (info.path.clone(), info.mode, info.oid.clone())
-            } else {
-                (PathBuf::new(), FileMode::Regular, ZERO_OID.to_string())
-            }
-        };
-        let current_external_path = match self.get_path_for_internal(internal_file_name) {
-            Some(p) => p,
-            None => return aggregated,
-        };
-
-        let current_mode = file_mode_for_path(&current_external_path).unwrap_or(FileMode::Regular);
-        let right_bytes = blob_bytes(&current_external_path, &current_mode);
-
-        // Compute displays with &mut self before borrowing any baseline content.
-        let left_display = self.relative_to_git_root_str(&baseline_external_path);
-        let right_display = self.relative_to_git_root_str(&current_external_path);
-
-        // Compute right oid before borrowing baseline content.
-        let right_oid = if let Some(b) = right_bytes.as_ref() {
-            if current_mode == FileMode::Symlink {
-                format!("{:x}", git_blob_sha1_hex_bytes(b))
-            } else {
-                self.git_blob_oid_for_path(&current_external_path)
-                    .unwrap_or_else(|| format!("{:x}", git_blob_sha1_hex_bytes(b)))
-            }
-        } else {
-            ZERO_OID.to_string()
-        };
-
-        // Borrow baseline content only after all &mut self uses are done.
-        let left_present = left_oid.as_str() != ZERO_OID;
-        let left_bytes: Option<&[u8]> = if left_present {
-            self.baseline_file_info
-                .get(internal_file_name)
-                .map(|i| i.content.as_slice())
-        } else {
-            None
-        };
-
-        // Fast path: identical bytes or both missing.
-        if left_bytes == right_bytes.as_deref() {
-            return aggregated;
-        }
-
-        aggregated.push_str(&format!("diff --git a/{left_display} b/{right_display}\n"));
-
-        let is_add = !left_present && right_bytes.is_some();
-        let is_delete = left_present && right_bytes.is_none();
-
-        if is_add {
-            aggregated.push_str(&format!("new file mode {current_mode}\n"));
-        } else if is_delete {
-            aggregated.push_str(&format!("deleted file mode {baseline_mode}\n"));
-        } else if baseline_mode != current_mode {
-            aggregated.push_str(&format!("old mode {baseline_mode}\n"));
-            aggregated.push_str(&format!("new mode {current_mode}\n"));
-        }
-
-        let left_text = left_bytes.and_then(|b| std::str::from_utf8(b).ok());
-        let right_text = right_bytes
-            .as_deref()
-            .and_then(|b| std::str::from_utf8(b).ok());
-
-        let can_text_diff = matches!(
-            (left_text, right_text, is_add, is_delete),
-            (Some(_), Some(_), _, _) | (_, Some(_), true, _) | (Some(_), _, _, true)
-        );
-
-        if can_text_diff {
-            let l = left_text.unwrap_or("");
-            let r = right_text.unwrap_or("");
-
-            aggregated.push_str(&format!("index {left_oid}..{right_oid}\n"));
-
-            let old_header = if left_present {
-                format!("a/{left_display}")
-            } else {
-                DEV_NULL.to_string()
-            };
-            let new_header = if right_bytes.is_some() {
-                format!("b/{right_display}")
-            } else {
-                DEV_NULL.to_string()
-            };
-
-            let diff = similar::TextDiff::from_lines(l, r);
-            let unified = diff
-                .unified_diff()
-                .context_radius(3)
-                .header(&old_header, &new_header)
-                .to_string();
-
-            aggregated.push_str(&unified);
-        } else {
-            aggregated.push_str(&format!("index {left_oid}..{right_oid}\n"));
-            let old_header = if left_present {
-                format!("a/{left_display}")
-            } else {
-                DEV_NULL.to_string()
-            };
-            let new_header = if right_bytes.is_some() {
-                format!("b/{right_display}")
-            } else {
-                DEV_NULL.to_string()
-            };
-            aggregated.push_str(&format!("--- {old_header}\n"));
-            aggregated.push_str(&format!("+++ {new_header}\n"));
-            aggregated.push_str("Binary files differ\n");
-        }
-        aggregated
-    }
-}
-
-/// Compute the Git SHA-1 blob object ID for the given content (bytes).
-fn git_blob_sha1_hex_bytes(data: &[u8]) -> Output<sha1::Sha1> {
-    // Git blob hash is sha1 of: "blob <len>\0<data>"
-    let header = format!("blob {}\0", data.len());
-    use sha1::Digest;
-    let mut hasher = sha1::Sha1::new();
-    hasher.update(header.as_bytes());
-    hasher.update(data);
-    hasher.finalize()
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-enum FileMode {
-    Regular,
-    #[cfg(unix)]
-    Executable,
-    Symlink,
-}
-
-impl FileMode {
-    fn as_str(&self) -> &'static str {
-        match self {
-            FileMode::Regular => "100644",
-            #[cfg(unix)]
-            FileMode::Executable => "100755",
-            FileMode::Symlink => "120000",
-        }
-    }
-}
-
-impl std::fmt::Display for FileMode {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.write_str(self.as_str())
-    }
-}
-
-#[cfg(unix)]
-fn file_mode_for_path(path: &Path) -> Option<FileMode> {
-    use std::os::unix::fs::PermissionsExt;
-    let meta = fs::symlink_metadata(path).ok()?;
-    let ft = meta.file_type();
-    if ft.is_symlink() {
-        return Some(FileMode::Symlink);
-    }
-    let mode = meta.permissions().mode();
-    let is_exec = (mode & 0o111) != 0;
-    Some(if is_exec {
-        FileMode::Executable
-    } else {
-        FileMode::Regular
-    })
-}
-
-#[cfg(not(unix))]
-fn file_mode_for_path(_path: &Path) -> Option<FileMode> {
-    // Default to non-executable on non-unix.
-    Some(FileMode::Regular)
-}
-
-fn blob_bytes(path: &Path, mode: &FileMode) -> Option<Vec<u8>> {
-    if path.exists() {
-        let contents = if *mode == FileMode::Symlink {
-            symlink_blob_bytes(path)
-                .ok_or_else(|| anyhow!("failed to read symlink target for {}", path.display()))
-        } else {
-            fs::read(path)
-                .with_context(|| format!("failed to read current file for diff {}", path.display()))
-        };
-        contents.ok()
-    } else {
-        None
-    }
-}
-
-#[cfg(unix)]
-fn symlink_blob_bytes(path: &Path) -> Option<Vec<u8>> {
-    use std::os::unix::ffi::OsStrExt;
-    let target = std::fs::read_link(path).ok()?;
-    Some(target.as_os_str().as_bytes().to_vec())
-}
-
-#[cfg(not(unix))]
-fn symlink_blob_bytes(_path: &Path) -> Option<Vec<u8>> {
-    None
-}
-
-#[cfg(windows)]
-fn is_windows_drive_or_unc_root(p: &std::path::Path) -> bool {
-    use std::path::Component;
-    let mut comps = p.components();
-    matches!(
-        (comps.next(), comps.next(), comps.next()),
-        (Some(Component::Prefix(_)), Some(Component::RootDir), None)
-    )
-}
-
-#[cfg(test)]
-mod tests {
-    #![allow(clippy::unwrap_used)]
-    use super::*;
-    use pretty_assertions::assert_eq;
-    use tempfile::tempdir;
-
-    /// Compute the Git SHA-1 blob object ID for the given content (string).
-    /// This delegates to the bytes version to avoid UTF-8 lossy conversions here.
-    fn git_blob_sha1_hex(data: &str) -> String {
-        format!("{:x}", git_blob_sha1_hex_bytes(data.as_bytes()))
-    }
-
-    fn normalize_diff_for_test(input: &str, root: &Path) -> String {
-        let root_str = root.display().to_string().replace('\\', "/");
-        let replaced = input.replace(&root_str, "<TMP>");
-        // Split into blocks on lines starting with "diff --git ", sort blocks for determinism, and rejoin
-        let mut blocks: Vec<String> = Vec::new();
-        let mut current = String::new();
-        for line in replaced.lines() {
-            if line.starts_with("diff --git ") && !current.is_empty() {
-                blocks.push(current);
-                current = String::new();
-            }
-            if !current.is_empty() {
-                current.push('\n');
-            }
-            current.push_str(line);
-        }
-        if !current.is_empty() {
-            blocks.push(current);
-        }
-        blocks.sort();
-        let mut out = blocks.join("\n");
-        if !out.ends_with('\n') {
-            out.push('\n');
-        }
-        out
-    }
-
-    #[test]
-    fn accumulates_add_and_update() {
-        let mut acc = TurnDiffTracker::new();
-
-        let dir = tempdir().unwrap();
-        let file = dir.path().join("a.txt");
-
-        // First patch: add file (baseline should be /dev/null).
-        let add_changes = HashMap::from([(
-            file.clone(),
-            FileChange::Add {
-                content: "foo\n".to_string(),
-            },
-        )]);
-        acc.on_patch_begin(&add_changes);
-
-        // Simulate apply: create the file on disk.
-        fs::write(&file, "foo\n").unwrap();
-        let first = acc.get_unified_diff().unwrap().unwrap();
-        let first = normalize_diff_for_test(&first, dir.path());
-        let expected_first = {
-            let mode = file_mode_for_path(&file).unwrap_or(FileMode::Regular);
-            let right_oid = git_blob_sha1_hex("foo\n");
-            format!(
-                r#"diff --git a/<TMP>/a.txt b/<TMP>/a.txt
-new file mode {mode}
-index {ZERO_OID}..{right_oid}
---- {DEV_NULL}
-+++ b/<TMP>/a.txt
-@@ -0,0 +1 @@
-+foo
-"#,
-            )
-        };
-        assert_eq!(first, expected_first);
-
-        // Second patch: update the file on disk.
-        let update_changes = HashMap::from([(
-            file.clone(),
-            FileChange::Update {
-                unified_diff: "".to_owned(),
-                move_path: None,
-            },
-        )]);
-        acc.on_patch_begin(&update_changes);
-
-        // Simulate apply: append a new line.
-        fs::write(&file, "foo\nbar\n").unwrap();
-        let combined = acc.get_unified_diff().unwrap().unwrap();
-        let combined = normalize_diff_for_test(&combined, dir.path());
-        let expected_combined = {
-            let mode = file_mode_for_path(&file).unwrap_or(FileMode::Regular);
-            let right_oid = git_blob_sha1_hex("foo\nbar\n");
-            format!(
-                r#"diff --git a/<TMP>/a.txt b/<TMP>/a.txt
-new file mode {mode}
-index {ZERO_OID}..{right_oid}
---- {DEV_NULL}
-+++ b/<TMP>/a.txt
-@@ -0,0 +1,2 @@
-+foo
-+bar
-"#,
-            )
-        };
-        assert_eq!(combined, expected_combined);
-    }
-
-    #[test]
-    fn accumulates_delete() {
-        let dir = tempdir().unwrap();
-        let file = dir.path().join("b.txt");
-        fs::write(&file, "x\n").unwrap();
-
-        let mut acc = TurnDiffTracker::new();
-        let del_changes = HashMap::from([(file.clone(), FileChange::Delete)]);
-        acc.on_patch_begin(&del_changes);
-
-        // Simulate apply: delete the file from disk.
-        let baseline_mode = file_mode_for_path(&file).unwrap_or(FileMode::Regular);
-        fs::remove_file(&file).unwrap();
-        let diff = acc.get_unified_diff().unwrap().unwrap();
-        let diff = normalize_diff_for_test(&diff, dir.path());
-        let expected = {
-            let left_oid = git_blob_sha1_hex("x\n");
-            format!(
-                r#"diff --git a/<TMP>/b.txt b/<TMP>/b.txt
-deleted file mode {baseline_mode}
-index {left_oid}..{ZERO_OID}
---- a/<TMP>/b.txt
-+++ {DEV_NULL}
-@@ -1 +0,0 @@
--x
-"#,
-            )
-        };
-        assert_eq!(diff, expected);
-    }
-
-    #[test]
-    fn accumulates_move_and_update() {
-        let dir = tempdir().unwrap();
-        let src = dir.path().join("src.txt");
-        let dest = dir.path().join("dst.txt");
-        fs::write(&src, "line\n").unwrap();
-
-        let mut acc = TurnDiffTracker::new();
-        let mv_changes = HashMap::from([(
-            src.clone(),
-            FileChange::Update {
-                unified_diff: "".to_owned(),
-                move_path: Some(dest.clone()),
-            },
-        )]);
-        acc.on_patch_begin(&mv_changes);
-
-        // Simulate apply: move and update content.
-        fs::rename(&src, &dest).unwrap();
-        fs::write(&dest, "line2\n").unwrap();
-
-        let out = acc.get_unified_diff().unwrap().unwrap();
-        let out = normalize_diff_for_test(&out, dir.path());
-        let expected = {
-            let left_oid = git_blob_sha1_hex("line\n");
-            let right_oid = git_blob_sha1_hex("line2\n");
-            format!(
-                r#"diff --git a/<TMP>/src.txt b/<TMP>/dst.txt
-index {left_oid}..{right_oid}
---- a/<TMP>/src.txt
-+++ b/<TMP>/dst.txt
-@@ -1 +1 @@
--line
-+line2
-"#
-            )
-        };
-        assert_eq!(out, expected);
-    }
-
-    #[test]
-    fn move_without_1change_yields_no_diff() {
-        let dir = tempdir().unwrap();
-        let src = dir.path().join("moved.txt");
-        let dest = dir.path().join("renamed.txt");
-        fs::write(&src, "same\n").unwrap();
-
-        let mut acc = TurnDiffTracker::new();
-        let mv_changes = HashMap::from([(
-            src.clone(),
-            FileChange::Update {
-                unified_diff: "".to_owned(),
-                move_path: Some(dest.clone()),
-            },
-        )]);
-        acc.on_patch_begin(&mv_changes);
-
-        // Simulate apply: move only, no content change.
-        fs::rename(&src, &dest).unwrap();
-
-        let diff = acc.get_unified_diff().unwrap();
-        assert_eq!(diff, None);
-    }
-
-    #[test]
-    fn move_declared_but_file_only_appears_at_dest_is_add() {
-        let dir = tempdir().unwrap();
-        let src = dir.path().join("src.txt");
-        let dest = dir.path().join("dest.txt");
-        let mut acc = TurnDiffTracker::new();
-        let mv = HashMap::from([(
-            src.clone(),
-            FileChange::Update {
-                unified_diff: "".into(),
-                move_path: Some(dest.clone()),
-            },
-        )]);
-        acc.on_patch_begin(&mv);
-        // No file existed initially; create only dest
-        fs::write(&dest, "hello\n").unwrap();
-        let diff = acc.get_unified_diff().unwrap().unwrap();
-        let diff = normalize_diff_for_test(&diff, dir.path());
-        let expected = {
-            let mode = file_mode_for_path(&dest).unwrap_or(FileMode::Regular);
-            let right_oid = git_blob_sha1_hex("hello\n");
-            format!(
-                r#"diff --git a/<TMP>/src.txt b/<TMP>/dest.txt
-new file mode {mode}
-index {ZERO_OID}..{right_oid}
---- {DEV_NULL}
-+++ b/<TMP>/dest.txt
-@@ -0,0 +1 @@
-+hello
-"#,
-            )
-        };
-        assert_eq!(diff, expected);
-    }
-
-    #[test]
-    fn update_persists_across_new_baseline_for_new_file() {
-        let dir = tempdir().unwrap();
-        let a = dir.path().join("a.txt");
-        let b = dir.path().join("b.txt");
-        fs::write(&a, "foo\n").unwrap();
-        fs::write(&b, "z\n").unwrap();
-
-        let mut acc = TurnDiffTracker::new();
-
-        // First: update existing a.txt (baseline snapshot is created for a).
-        let update_a = HashMap::from([(
-            a.clone(),
-            FileChange::Update {
-                unified_diff: "".to_owned(),
-                move_path: None,
-            },
-        )]);
-        acc.on_patch_begin(&update_a);
-        // Simulate apply: modify a.txt on disk.
-        fs::write(&a, "foo\nbar\n").unwrap();
-        let first = acc.get_unified_diff().unwrap().unwrap();
-        let first = normalize_diff_for_test(&first, dir.path());
-        let expected_first = {
-            let left_oid = git_blob_sha1_hex("foo\n");
-            let right_oid = git_blob_sha1_hex("foo\nbar\n");
-            format!(
-                r#"diff --git a/<TMP>/a.txt b/<TMP>/a.txt
-index {left_oid}..{right_oid}
---- a/<TMP>/a.txt
-+++ b/<TMP>/a.txt
-@@ -1 +1,2 @@
- foo
-+bar
-"#
-            )
-        };
-        assert_eq!(first, expected_first);
-
-        // Next: introduce a brand-new path b.txt into baseline snapshots via a delete change.
-        let del_b = HashMap::from([(b.clone(), FileChange::Delete)]);
-        acc.on_patch_begin(&del_b);
-        // Simulate apply: delete b.txt.
-        let baseline_mode = file_mode_for_path(&b).unwrap_or(FileMode::Regular);
-        fs::remove_file(&b).unwrap();
-
-        let combined = acc.get_unified_diff().unwrap().unwrap();
-        let combined = normalize_diff_for_test(&combined, dir.path());
-        let expected = {
-            let left_oid_a = git_blob_sha1_hex("foo\n");
-            let right_oid_a = git_blob_sha1_hex("foo\nbar\n");
-            let left_oid_b = git_blob_sha1_hex("z\n");
-            format!(
-                r#"diff --git a/<TMP>/a.txt b/<TMP>/a.txt
-index {left_oid_a}..{right_oid_a}
---- a/<TMP>/a.txt
-+++ b/<TMP>/a.txt
-@@ -1 +1,2 @@
- foo
-+bar
-diff --git a/<TMP>/b.txt b/<TMP>/b.txt
-deleted file mode {baseline_mode}
-index {left_oid_b}..{ZERO_OID}
---- a/<TMP>/b.txt
-+++ {DEV_NULL}
-@@ -1 +0,0 @@
--z
-"#,
-            )
-        };
-        assert_eq!(combined, expected);
-    }
-
-    #[test]
-    fn binary_files_differ_update() {
-        let dir = tempdir().unwrap();
-        let file = dir.path().join("bin.dat");
-
-        // Initial non-UTF8 bytes
-        let left_bytes: Vec<u8> = vec![0xff, 0xfe, 0xfd, 0x00];
-        // Updated non-UTF8 bytes
-        let right_bytes: Vec<u8> = vec![0x01, 0x02, 0x03, 0x00];
-
-        fs::write(&file, &left_bytes).unwrap();
-
-        let mut acc = TurnDiffTracker::new();
-        let update_changes = HashMap::from([(
-            file.clone(),
-            FileChange::Update {
-                unified_diff: "".to_owned(),
-                move_path: None,
-            },
-        )]);
-        acc.on_patch_begin(&update_changes);
-
-        // Apply update on disk
-        fs::write(&file, &right_bytes).unwrap();
-
-        let diff = acc.get_unified_diff().unwrap().unwrap();
-        let diff = normalize_diff_for_test(&diff, dir.path());
-        let expected = {
-            let left_oid = format!("{:x}", git_blob_sha1_hex_bytes(&left_bytes));
-            let right_oid = format!("{:x}", git_blob_sha1_hex_bytes(&right_bytes));
-            format!(
-                r#"diff --git a/<TMP>/bin.dat b/<TMP>/bin.dat
-index {left_oid}..{right_oid}
---- a/<TMP>/bin.dat
-+++ b/<TMP>/bin.dat
-Binary files differ
-"#
-            )
-        };
-        assert_eq!(diff, expected);
-    }
-
-    #[test]
-    fn filenames_with_spaces_add_and_update() {
-        let mut acc = TurnDiffTracker::new();
-
-        let dir = tempdir().unwrap();
-        let file = dir.path().join("name with spaces.txt");
-
-        // First patch: add file (baseline should be /dev/null).
-        let add_changes = HashMap::from([(
-            file.clone(),
-            FileChange::Add {
-                content: "foo\n".to_string(),
-            },
-        )]);
-        acc.on_patch_begin(&add_changes);
-
-        // Simulate apply: create the file on disk.
-        fs::write(&file, "foo\n").unwrap();
-        let first = acc.get_unified_diff().unwrap().unwrap();
-        let first = normalize_diff_for_test(&first, dir.path());
-        let expected_first = {
-            let mode = file_mode_for_path(&file).unwrap_or(FileMode::Regular);
-            let right_oid = git_blob_sha1_hex("foo\n");
-            format!(
-                r#"diff --git a/<TMP>/name with spaces.txt b/<TMP>/name with spaces.txt
-new file mode {mode}
-index {ZERO_OID}..{right_oid}
---- {DEV_NULL}
-+++ b/<TMP>/name with spaces.txt
-@@ -0,0 +1 @@
-+foo
-"#,
-            )
-        };
-        assert_eq!(first, expected_first);
-
-        // Second patch: update the file on disk.
-        let update_changes = HashMap::from([(
-            file.clone(),
-            FileChange::Update {
-                unified_diff: "".to_owned(),
-                move_path: None,
-            },
-        )]);
-        acc.on_patch_begin(&update_changes);
-
-        // Simulate apply: append a new line with a space.
-        fs::write(&file, "foo\nbar baz\n").unwrap();
-        let combined = acc.get_unified_diff().unwrap().unwrap();
-        let combined = normalize_diff_for_test(&combined, dir.path());
-        let expected_combined = {
-            let mode = file_mode_for_path(&file).unwrap_or(FileMode::Regular);
-            let right_oid = git_blob_sha1_hex("foo\nbar baz\n");
-            format!(
-                r#"diff --git a/<TMP>/name with spaces.txt b/<TMP>/name with spaces.txt
-new file mode {mode}
-index {ZERO_OID}..{right_oid}
---- {DEV_NULL}
-+++ b/<TMP>/name with spaces.txt
-@@ -0,0 +1,2 @@
-+foo
-+bar baz
-"#,
-            )
-        };
-        assert_eq!(combined, expected_combined);
-    }
-}

codex-rs/core/tests/client.rs

@@ -4,7 +4,6 @@ use chrono::Utc;
 use codex_core::Codex;
 use codex_core::CodexSpawnOk;
 use codex_core::ModelProviderInfo;
-use codex_core::WireApi;
 use codex_core::built_in_model_providers;
 use codex_core::protocol::EventMsg;
 use codex_core::protocol::InputItem;
@@ -22,10 +21,8 @@ use tempfile::TempDir;
 use wiremock::Mock;
 use wiremock::MockServer;
 use wiremock::ResponseTemplate;
-use wiremock::matchers::header_regex;
 use wiremock::matchers::method;
 use wiremock::matchers::path;
-use wiremock::matchers::query_param;
 
 /// Build minimal SSE stream with completed marker using the JSON fixture.
 fn sse_completed(id: &str) -> String {
@@ -376,90 +373,9 @@ async fn includes_user_instructions_message_in_request() {
         request_body["input"][0]["content"][0]["text"]
             .as_str()
             .unwrap()
-            .starts_with("<user_instructions>\n\nbe nice")
-    );
-    assert!(
-        request_body["input"][0]["content"][0]["text"]
-            .as_str()
-            .unwrap()
-            .ends_with("</user_instructions>")
+            .starts_with("be nice")
     );
 }
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn azure_overrides_assign_properties_used_for_responses_url() {
-    #![allow(clippy::unwrap_used)]
-
-    let existing_env_var_with_random_value = if cfg!(windows) { "USERNAME" } else { "USER" };
-
-    // Mock server
-    let server = MockServer::start().await;
-
-    // First request – must NOT include `previous_response_id`.
-    let first = ResponseTemplate::new(200)
-        .insert_header("content-type", "text/event-stream")
-        .set_body_raw(sse_completed("resp1"), "text/event-stream");
-
-    // Expect POST to /openai/responses with api-version query param
-    Mock::given(method("POST"))
-        .and(path("/openai/responses"))
-        .and(query_param("api-version", "2025-04-01-preview"))
-        .and(header_regex("Custom-Header", "Value"))
-        .and(header_regex(
-            "Authorization",
-            format!(
-                "Bearer {}",
-                std::env::var(existing_env_var_with_random_value).unwrap()
-            )
-            .as_str(),
-        ))
-        .respond_with(first)
-        .expect(1)
-        .mount(&server)
-        .await;
-
-    let provider = ModelProviderInfo {
-        name: "custom".to_string(),
-        base_url: Some(format!("{}/openai", server.uri())),
-        // Reuse the existing environment variable to avoid using unsafe code
-        env_key: Some(existing_env_var_with_random_value.to_string()),
-        query_params: Some(std::collections::HashMap::from([(
-            "api-version".to_string(),
-            "2025-04-01-preview".to_string(),
-        )])),
-        env_key_instructions: None,
-        wire_api: WireApi::Responses,
-        http_headers: Some(std::collections::HashMap::from([(
-            "Custom-Header".to_string(),
-            "Value".to_string(),
-        )])),
-        env_http_headers: None,
-        request_max_retries: None,
-        stream_max_retries: None,
-        stream_idle_timeout_ms: None,
-        requires_auth: false,
-    };
-
-    // Init session
-    let codex_home = TempDir::new().unwrap();
-    let mut config = load_default_config_for_test(&codex_home);
-    config.model_provider = provider;
-
-    let ctrl_c = std::sync::Arc::new(tokio::sync::Notify::new());
-    let CodexSpawnOk { codex, .. } = Codex::spawn(config, None, ctrl_c.clone()).await.unwrap();
-
-    codex
-        .submit(Op::UserInput {
-            items: vec![InputItem::Text {
-                text: "hello".into(),
-            }],
-        })
-        .await
-        .unwrap();
-
-    wait_for_event(&codex, |ev| matches!(ev, EventMsg::TaskComplete(_))).await;
-}
-
 fn auth_from_token(id_token: String) -> CodexAuth {
     CodexAuth::new(
         None,

codex-rs/core/tests/exec.rs

@@ -1,69 +0,0 @@
-#![cfg(target_os = "macos")]
-#![expect(clippy::expect_used)]
-
-use std::collections::HashMap;
-use std::sync::Arc;
-
-use codex_core::exec::ExecParams;
-use codex_core::exec::SandboxType;
-use codex_core::exec::process_exec_tool_call;
-use codex_core::protocol::SandboxPolicy;
-use codex_core::spawn::CODEX_SANDBOX_ENV_VAR;
-use tempfile::TempDir;
-use tokio::sync::Notify;
-
-use codex_core::get_platform_sandbox;
-
-async fn run_test_cmd(tmp: TempDir, cmd: Vec<&str>, should_be_ok: bool) {
-    if std::env::var(CODEX_SANDBOX_ENV_VAR) == Ok("seatbelt".to_string()) {
-        eprintln!("{CODEX_SANDBOX_ENV_VAR} is set to 'seatbelt', skipping test.");
-        return;
-    }
-
-    let sandbox_type = get_platform_sandbox().expect("should be able to get sandbox type");
-    assert_eq!(sandbox_type, SandboxType::MacosSeatbelt);
-
-    let params = ExecParams {
-        command: cmd.iter().map(|s| s.to_string()).collect(),
-        cwd: tmp.path().to_path_buf(),
-        timeout_ms: Some(1000),
-        env: HashMap::new(),
-    };
-
-    let ctrl_c = Arc::new(Notify::new());
-    let policy = SandboxPolicy::new_read_only_policy();
-
-    let result = process_exec_tool_call(params, sandbox_type, ctrl_c, &policy, &None, None).await;
-
-    assert!(result.is_ok() == should_be_ok);
-}
-
-/// Command succeeds with exit code 0 normally
-#[tokio::test]
-async fn exit_code_0_succeeds() {
-    let tmp = TempDir::new().expect("should be able to create temp dir");
-    let cmd = vec!["echo", "hello"];
-
-    run_test_cmd(tmp, cmd, true).await
-}
-
-/// Command not found returns exit code 127, this is not considered a sandbox error
-#[tokio::test]
-async fn exit_command_not_found_is_ok() {
-    let tmp = TempDir::new().expect("should be able to create temp dir");
-    let cmd = vec!["/bin/bash", "-c", "nonexistent_command_12345"];
-    run_test_cmd(tmp, cmd, true).await
-}
-
-/// Writing a file fails and should be considered a sandbox error
-#[tokio::test]
-async fn write_file_fails_as_sandbox_error() {
-    let tmp = TempDir::new().expect("should be able to create temp dir");
-    let path = tmp.path().join("test.txt");
-    let cmd = vec![
-        "/user/bin/touch",
-        path.to_str().expect("should be able to get path"),
-    ];
-
-    run_test_cmd(tmp, cmd, false).await;
-}

codex-rs/exec/src/event_processor.rs

@@ -44,14 +44,20 @@ pub(crate) fn create_config_summary_entries(config: &Config) -> Vec<(&'static st
     entries
 }
 
-pub(crate) fn handle_last_message(last_agent_message: Option<&str>, output_file: &Path) {
-    let message = last_agent_message.unwrap_or_default();
-    write_last_message_file(message, Some(output_file));
-    if last_agent_message.is_none() {
-        eprintln!(
-            "Warning: no last agent message; wrote empty content to {}",
-            output_file.display()
-        );
+pub(crate) fn handle_last_message(
+    last_agent_message: Option<&str>,
+    last_message_path: Option<&Path>,
+) {
+    match (last_message_path, last_agent_message) {
+        (Some(path), Some(msg)) => write_last_message_file(msg, Some(path)),
+        (Some(path), None) => {
+            write_last_message_file("", Some(path));
+            eprintln!(
+                "Warning: no last agent message; wrote empty content to {}",
+                path.display()
+            );
+        }
+        (None, _) => eprintln!("Warning: no file to write last message to."),
     }
 }
 

codex-rs/exec/src/event_processor_with_human_output.rs

@@ -20,7 +20,6 @@ use codex_core::protocol::PatchApplyEndEvent;
 use codex_core::protocol::SessionConfiguredEvent;
 use codex_core::protocol::TaskCompleteEvent;
 use codex_core::protocol::TokenUsage;
-use codex_core::protocol::TurnDiffEvent;
 use owo_colors::OwoColorize;
 use owo_colors::Style;
 use shlex::try_join;
@@ -170,9 +169,10 @@ impl EventProcessor for EventProcessorWithHumanOutput {
                 // Ignore.
             }
             EventMsg::TaskComplete(TaskCompleteEvent { last_agent_message }) => {
-                if let Some(output_file) = self.last_message_path.as_deref() {
-                    handle_last_message(last_agent_message.as_deref(), output_file);
-                }
+                handle_last_message(
+                    last_agent_message.as_deref(),
+                    self.last_message_path.as_deref(),
+                );
                 return CodexStatus::InitiateShutdown;
             }
             EventMsg::TokenCount(TokenUsage { total_tokens, .. }) => {
@@ -399,7 +399,6 @@ impl EventProcessor for EventProcessorWithHumanOutput {
                 stdout,
                 stderr,
                 success,
-                ..
             }) => {
                 let patch_begin = self.call_id_to_patch.remove(&call_id);
 
@@ -429,10 +428,6 @@ impl EventProcessor for EventProcessorWithHumanOutput {
                     println!("{}", line.style(self.dimmed));
                 }
             }
-            EventMsg::TurnDiff(TurnDiffEvent { unified_diff }) => {
-                ts_println!(self, "{}", "turn diff:".style(self.magenta));
-                println!("{unified_diff}");
-            }
             EventMsg::ExecApprovalRequest(_) => {
                 // Should we exit?
             }

codex-rs/exec/src/event_processor_with_json_output.rs

@@ -46,9 +46,10 @@ impl EventProcessor for EventProcessorWithJsonOutput {
                 CodexStatus::Running
             }
             EventMsg::TaskComplete(TaskCompleteEvent { last_agent_message }) => {
-                if let Some(output_file) = self.last_message_path.as_deref() {
-                    handle_last_message(last_agent_message.as_deref(), output_file);
-                }
+                handle_last_message(
+                    last_agent_message.as_deref(),
+                    self.last_message_path.as_deref(),
+                );
                 CodexStatus::InitiateShutdown
             }
             EventMsg::ShutdownComplete => CodexStatus::Shutdown,

codex-rs/execpolicy/Cargo.toml

@@ -26,7 +26,7 @@ multimap = "0.10.0"
 path-absolutize = "3.1.1"
 regex-lite = "0.1"
 serde = { version = "1.0.194", features = ["derive"] }
-serde_json = "1.0.142"
+serde_json = "1.0.110"
 serde_with = { version = "3", features = ["macros"] }
 
 [dev-dependencies]

codex-rs/file-search/Cargo.toml

@@ -17,5 +17,5 @@ clap = { version = "4", features = ["derive"] }
 ignore = "0.4.23"
 nucleo-matcher = "0.3.1"
 serde = { version = "1", features = ["derive"] }
-serde_json = "1.0.142"
+serde_json = "1.0.110"
 tokio = { version = "1", features = ["full"] }

codex-rs/login/src/lib.rs

@@ -22,7 +22,7 @@ const SOURCE_FOR_PYTHON_SERVER: &str = include_str!("./login_with_chatgpt.py");
 const CLIENT_ID: &str = "app_EMoamEEZ73f0CkXaXp7hrann";
 pub const OPENAI_API_KEY_ENV_VAR: &str = "OPENAI_API_KEY";
 
-#[derive(Clone, Debug, PartialEq, Copy)]
+#[derive(Clone, Debug, PartialEq)]
 pub enum AuthMode {
     ApiKey,
     ChatGPT,

codex-rs/login/src/login_with_chatgpt.py

@@ -458,7 +458,6 @@ class _ApiKeyHTTPServer(http.server.HTTPServer):
             "code_challenge": self.pkce.code_challenge,
             "code_challenge_method": "S256",
             "id_token_add_organizations": "true",
-            "codex_cli_simplified_flow": "true",
             "state": self.state,
         }
         return f"{self.issuer}/oauth/authorize?" + urllib.parse.urlencode(params)

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

@@ -263,7 +263,6 @@ async fn run_codex_tool_session_inner(
                     | EventMsg::BackgroundEvent(_)
                     | EventMsg::PatchApplyBegin(_)
                     | EventMsg::PatchApplyEnd(_)
-                    | EventMsg::TurnDiff(_)
                     | EventMsg::GetHistoryEntryResponse(_)
                     | EventMsg::PlanUpdate(_)
                     | EventMsg::ShutdownComplete => {

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

@@ -97,7 +97,6 @@ pub async fn run_conversation_loop(
                     | EventMsg::McpToolCallEnd(_)
                     | EventMsg::ExecCommandBegin(_)
                     | EventMsg::ExecCommandEnd(_)
-                    | EventMsg::TurnDiff(_)
                     | EventMsg::BackgroundEvent(_)
                     | EventMsg::ExecCommandOutputDelta(_)
                     | EventMsg::PatchApplyBegin(_)

codex-rs/tui/Cargo.toml

@@ -11,10 +11,6 @@ path = "src/main.rs"
 name = "codex_tui"
 path = "src/lib.rs"
 
-[features]
-# Enable vt100-based tests (emulator) when running with `--features vt100-tests`.
-vt100-tests = []
-
 [lints]
 workspace = true
 
@@ -77,4 +73,3 @@ insta = "1.43.1"
 pretty_assertions = "1"
 rand = "0.8"
 chrono = { version = "0.4", features = ["serde"] }
-vt100 = "0.16.2"

codex-rs/tui/src/app.rs

@@ -5,6 +5,7 @@ use crate::file_search::FileSearchManager;
 use crate::get_git_diff::get_git_diff;
 use crate::git_warning_screen::GitWarningOutcome;
 use crate::git_warning_screen::GitWarningScreen;
+use crate::shimmer_text::init_process_start;
 use crate::slash_command::SlashCommand;
 use crate::tui;
 use codex_core::config::Config;
@@ -21,13 +22,10 @@ use ratatui::layout::Offset;
 use ratatui::prelude::Backend;
 use ratatui::text::Line;
 use std::path::PathBuf;
-use std::sync::Arc;
-use std::sync::atomic::AtomicBool;
-use std::sync::atomic::Ordering;
 use std::sync::mpsc::Receiver;
 use std::sync::mpsc::channel;
-use std::thread;
 use std::time::Duration;
+use std::time::Instant;
 
 /// Time window for debouncing redraw requests.
 const REDRAW_DEBOUNCE: Duration = Duration::from_millis(10);
@@ -55,9 +53,6 @@ pub(crate) struct App<'a> {
 
     file_search: FileSearchManager,
 
-    /// True when a redraw has been scheduled but not yet executed.
-    pending_redraw: Arc<AtomicBool>,
-
     pending_history_lines: Vec<Line<'static>>,
 
     /// Stored parameters needed to instantiate the ChatWidget later, e.g.,
@@ -65,6 +60,10 @@ pub(crate) struct App<'a> {
     chat_args: Option<ChatWidgetArgs>,
 
     enhanced_keys_supported: bool,
+
+    /// Channel to schedule one-shot animation frames; coalesced by a single
+    /// scheduler thread.
+    frame_schedule_tx: std::sync::mpsc::Sender<Instant>,
 }
 
 /// Aggregate parameters needed to create a `ChatWidget`, as creation may be
@@ -86,7 +85,6 @@ impl App<'_> {
     ) -> Self {
         let (app_event_tx, app_event_rx) = channel();
         let app_event_tx = AppEventSender::new(app_event_tx);
-        let pending_redraw = Arc::new(AtomicBool::new(false));
 
         let enhanced_keys_supported = supports_keyboard_enhancement().unwrap_or(false);
 
@@ -133,6 +131,9 @@ impl App<'_> {
             });
         }
 
+        // Initialize process start time for synchronized animations.
+        init_process_start();
+
         let (app_state, chat_args) = if show_git_warning {
             (
                 AppState::GitWarning {
@@ -162,6 +163,50 @@ impl App<'_> {
         };
 
         let file_search = FileSearchManager::new(config.cwd.clone(), app_event_tx.clone());
+
+        // Spawn a single scheduler thread that coalesces both debounced redraw
+        // requests and animation frame requests, and emits a single Redraw event
+        // at the earliest requested time.
+        let (frame_tx, frame_rx) = channel::<Instant>();
+        {
+            let app_event_tx = app_event_tx.clone();
+            std::thread::spawn(move || {
+                use std::sync::mpsc::RecvTimeoutError;
+                let mut next_deadline: Option<Instant> = None;
+                loop {
+                    // If no scheduled deadline, block until we get one.
+                    if next_deadline.is_none() {
+                        match frame_rx.recv() {
+                            Ok(deadline) => next_deadline = Some(deadline),
+                            Err(_) => break, // channel closed; exit thread
+                        }
+                    }
+
+                    #[allow(clippy::expect_used)]
+                    let deadline = next_deadline.expect("set above");
+                    let now = Instant::now();
+                    let timeout = if deadline > now {
+                        deadline - now
+                    } else {
+                        Duration::from_millis(0)
+                    };
+
+                    match frame_rx.recv_timeout(timeout) {
+                        Ok(new_deadline) => {
+                            // Coalesce by keeping the earliest deadline.
+                            next_deadline =
+                                Some(next_deadline.map_or(new_deadline, |d| d.min(new_deadline)));
+                        }
+                        Err(RecvTimeoutError::Timeout) => {
+                            // Fire once, then clear the deadline.
+                            app_event_tx.send(AppEvent::Redraw);
+                            next_deadline = None;
+                        }
+                        Err(RecvTimeoutError::Disconnected) => break,
+                    }
+                }
+            });
+        }
         Self {
             app_event_tx,
             pending_history_lines: Vec::new(),
@@ -169,9 +214,9 @@ impl App<'_> {
             app_state,
             config,
             file_search,
-            pending_redraw,
             chat_args,
             enhanced_keys_supported,
+            frame_schedule_tx: frame_tx,
         }
     }
 
@@ -181,32 +226,13 @@ impl App<'_> {
         self.app_event_tx.clone()
     }
 
-    /// Schedule a redraw if one is not already pending.
-    #[allow(clippy::unwrap_used)]
-    fn schedule_redraw(&self) {
-        // Attempt to set the flag to `true`. If it was already `true`, another
-        // redraw is already pending so we can return early.
-        if self
-            .pending_redraw
-            .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst)
-            .is_err()
-        {
-            return;
-        }
-
-        let tx = self.app_event_tx.clone();
-        let pending_redraw = self.pending_redraw.clone();
-        thread::spawn(move || {
-            thread::sleep(REDRAW_DEBOUNCE);
-            tx.send(AppEvent::Redraw);
-            pending_redraw.store(false, Ordering::SeqCst);
-        });
+    fn schedule_frame_in(&self, dur: Duration) {
+        let _ = self.frame_schedule_tx.send(Instant::now() + dur);
     }
 
     pub(crate) fn run(&mut self, terminal: &mut tui::Tui) -> Result<()> {
-        // Insert an event to trigger the first render.
-        let app_event_tx = self.app_event_tx.clone();
-        app_event_tx.send(AppEvent::RequestRedraw);
+        // Trigger the first render immediately via the frame scheduler.
+        let _ = self.frame_schedule_tx.send(Instant::now());
 
         while let Ok(event) = self.app_event_rx.recv() {
             match event {
@@ -215,7 +241,10 @@ impl App<'_> {
                     self.app_event_tx.send(AppEvent::RequestRedraw);
                 }
                 AppEvent::RequestRedraw => {
-                    self.schedule_redraw();
+                    self.schedule_frame_in(REDRAW_DEBOUNCE);
+                }
+                AppEvent::ScheduleFrameIn(dur) => {
+                    self.schedule_frame_in(dur);
                 }
                 AppEvent::Redraw => {
                     std::io::stdout().sync_update(|_| self.draw_next_frame(terminal))??;

codex-rs/tui/src/app_event.rs

@@ -2,6 +2,7 @@ use codex_core::protocol::Event;
 use codex_file_search::FileMatch;
 use crossterm::event::KeyEvent;
 use ratatui::text::Line;
+use std::time::Duration;
 
 use crate::slash_command::SlashCommand;
 
@@ -15,6 +16,11 @@ pub(crate) enum AppEvent {
     /// Actually draw the next frame.
     Redraw,
 
+    /// Schedule periodic frames from the main loop. The first frame will be
+    /// scheduled roughly after the provided duration and continue at that
+    /// cadence until the application exits.
+    ScheduleFrameIn(Duration),
+
     KeyEvent(KeyEvent),
 
     /// Text pasted from the terminal clipboard.

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

@@ -1,45 +0,0 @@
-use ratatui::buffer::Buffer;
-use ratatui::layout::Rect;
-use ratatui::text::Line;
-use ratatui::widgets::Paragraph;
-use ratatui::widgets::WidgetRef;
-
-/// Minimal rendering-only widget for the transient ring rows.
-pub(crate) struct LiveRingWidget {
-    max_rows: u16,
-    rows: Vec<Line<'static>>, // newest at the end
-}
-
-impl LiveRingWidget {
-    pub fn new() -> Self {
-        Self {
-            max_rows: 3,
-            rows: Vec::new(),
-        }
-    }
-
-    pub fn set_max_rows(&mut self, n: u16) {
-        self.max_rows = n.max(1);
-    }
-
-    pub fn set_rows(&mut self, rows: Vec<Line<'static>>) {
-        self.rows = rows;
-    }
-
-    pub fn desired_height(&self, _width: u16) -> u16 {
-        let len = self.rows.len() as u16;
-        len.min(self.max_rows)
-    }
-}
-
-impl WidgetRef for LiveRingWidget {
-    fn render_ref(&self, area: Rect, buf: &mut Buffer) {
-        if area.height == 0 {
-            return;
-        }
-        let visible = self.rows.len().saturating_sub(self.max_rows as usize);
-        let slice = &self.rows[visible..];
-        let para = Paragraph::new(slice.to_vec());
-        para.render_ref(area, buf);
-    }
-}

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

@@ -4,12 +4,12 @@ use crate::app_event::AppEvent;
 use crate::app_event_sender::AppEventSender;
 use crate::user_approval_widget::ApprovalRequest;
 use bottom_pane_view::BottomPaneView;
+use bottom_pane_view::ConditionalUpdate;
 use codex_core::protocol::TokenUsage;
 use codex_file_search::FileMatch;
 use crossterm::event::KeyEvent;
 use ratatui::buffer::Buffer;
 use ratatui::layout::Rect;
-use ratatui::text::Line;
 use ratatui::widgets::WidgetRef;
 
 mod approval_modal_view;
@@ -18,7 +18,6 @@ mod chat_composer;
 mod chat_composer_history;
 mod command_popup;
 mod file_search_popup;
-mod live_ring_widget;
 mod status_indicator_view;
 mod textarea;
 
@@ -31,7 +30,6 @@ pub(crate) enum CancellationEvent {
 pub(crate) use chat_composer::ChatComposer;
 pub(crate) use chat_composer::InputResult;
 
-use crate::status_indicator_widget::StatusIndicatorWidget;
 use approval_modal_view::ApprovalModalView;
 use status_indicator_view::StatusIndicatorView;
 
@@ -48,19 +46,6 @@ pub(crate) struct BottomPane<'a> {
     has_input_focus: bool,
     is_task_running: bool,
     ctrl_c_quit_hint: bool,
-
-    /// Optional live, multi‑line status/"live cell" rendered directly above
-    /// the composer while a task is running. Unlike `active_view`, this does
-    /// not replace the composer; it augments it.
-    live_status: Option<StatusIndicatorWidget>,
-
-    /// Optional transient ring shown above the composer. This is a rendering-only
-    /// container used during development before we wire it to ChatWidget events.
-    live_ring: Option<live_ring_widget::LiveRingWidget>,
-
-    /// True if the active view is the StatusIndicatorView that replaces the
-    /// composer during a running task.
-    status_view_active: bool,
 }
 
 pub(crate) struct BottomPaneParams {
@@ -70,7 +55,6 @@ pub(crate) struct BottomPaneParams {
 }
 
 impl BottomPane<'_> {
-    const BOTTOM_PAD_LINES: u16 = 2;
     pub fn new(params: BottomPaneParams) -> Self {
         let enhanced_keys_supported = params.enhanced_keys_supported;
         Self {
@@ -84,40 +68,14 @@ impl BottomPane<'_> {
             has_input_focus: params.has_input_focus,
             is_task_running: false,
             ctrl_c_quit_hint: false,
-            live_status: None,
-            live_ring: None,
-            status_view_active: false,
         }
     }
 
     pub fn desired_height(&self, width: u16) -> u16 {
-        let overlay_status_h = self
-            .live_status
+        self.active_view
             .as_ref()
-            .map(|s| s.desired_height(width))
-            .unwrap_or(0);
-        let ring_h = self
-            .live_ring
-            .as_ref()
-            .map(|r| r.desired_height(width))
-            .unwrap_or(0);
-
-        let view_height = if let Some(view) = self.active_view.as_ref() {
-            // Add a single blank spacer line between live ring and status view when active.
-            let spacer = if self.live_ring.is_some() && self.status_view_active {
-                1
-            } else {
-                0
-            };
-            spacer + view.desired_height(width)
-        } else {
-            self.composer.desired_height(width)
-        };
-
-        overlay_status_h
-            .saturating_add(ring_h)
-            .saturating_add(view_height)
-            .saturating_add(Self::BOTTOM_PAD_LINES)
+            .map(|v| v.desired_height(width))
+            .unwrap_or(self.composer.desired_height(width))
     }
 
     pub fn cursor_pos(&self, area: Rect) -> Option<(u16, u16)> {
@@ -138,6 +96,10 @@ impl BottomPane<'_> {
             view.handle_key_event(self, key_event);
             if !view.is_complete() {
                 self.active_view = Some(view);
+            } else if self.is_task_running {
+                self.active_view = Some(Box::new(StatusIndicatorView::new(
+                    self.app_event_tx.clone(),
+                )));
             }
             self.request_redraw();
             InputResult::None
@@ -163,6 +125,10 @@ impl BottomPane<'_> {
             CancellationEvent::Handled => {
                 if !view.is_complete() {
                     self.active_view = Some(view);
+                } else if self.is_task_running {
+                    self.active_view = Some(Box::new(StatusIndicatorView::new(
+                        self.app_event_tx.clone(),
+                    )));
                 }
                 self.show_ctrl_c_quit_hint();
             }
@@ -182,37 +148,19 @@ impl BottomPane<'_> {
         }
     }
 
-    /// Update the status indicator text. Prefer replacing the composer with
-    /// the StatusIndicatorView so the input pane shows a single-line status
-    /// like: `▌ Working waiting for model`.
+    /// Update the status indicator text (only when the `StatusIndicatorView` is
+    /// active).
     pub(crate) fn update_status_text(&mut self, text: String) {
-        let mut handled_by_view = false;
-        if let Some(view) = self.active_view.as_mut() {
-            if matches!(
-                view.update_status_text(text.clone()),
-                bottom_pane_view::ConditionalUpdate::NeedsRedraw
-            ) {
-                handled_by_view = true;
-            }
-        } else {
-            let mut v = StatusIndicatorView::new(self.app_event_tx.clone());
-            v.update_text(text.clone());
-            self.active_view = Some(Box::new(v));
-            self.status_view_active = true;
-            handled_by_view = true;
-        }
-
-        // Fallback: if the current active view did not consume status updates,
-        // present an overlay above the composer.
-        if !handled_by_view {
-            if self.live_status.is_none() {
-                self.live_status = Some(StatusIndicatorWidget::new(self.app_event_tx.clone()));
-            }
-            if let Some(status) = &mut self.live_status {
-                status.update_text(text);
+        if let Some(view) = &mut self.active_view {
+            match view.update_status_text(text) {
+                ConditionalUpdate::NeedsRedraw => {
+                    self.request_redraw();
+                }
+                ConditionalUpdate::NoRedraw => {
+                    // No redraw needed.
+                }
             }
         }
-        self.request_redraw();
     }
 
     pub(crate) fn show_ctrl_c_quit_hint(&mut self) {
@@ -238,23 +186,27 @@ impl BottomPane<'_> {
     pub fn set_task_running(&mut self, running: bool) {
         self.is_task_running = running;
 
-        if running {
-            if self.active_view.is_none() {
+        match (running, self.active_view.is_some()) {
+            (true, false) => {
+                // Show status indicator overlay.
                 self.active_view = Some(Box::new(StatusIndicatorView::new(
                     self.app_event_tx.clone(),
                 )));
-                self.status_view_active = true;
+                self.request_redraw();
             }
-            self.request_redraw();
-        } else {
-            self.live_status = None;
-            // Drop the status view when a task completes, but keep other
-            // modal views (e.g. approval dialogs).
-            if let Some(mut view) = self.active_view.take() {
-                if !view.should_hide_when_task_is_done() {
-                    self.active_view = Some(view);
+            (false, true) => {
+                if let Some(mut view) = self.active_view.take() {
+                    if view.should_hide_when_task_is_done() {
+                        // Leave self.active_view as None.
+                        self.request_redraw();
+                    } else {
+                        // Preserve the view.
+                        self.active_view = Some(view);
+                    }
                 }
-                self.status_view_active = false;
+            }
+            _ => {
+                // No change.
             }
         }
     }
@@ -296,7 +248,6 @@ impl BottomPane<'_> {
         // Otherwise create a new approval modal overlay.
         let modal = ApprovalModalView::new(request, self.app_event_tx.clone());
         self.active_view = Some(Box::new(modal));
-        self.status_view_active = false;
         self.request_redraw()
     }
 
@@ -330,80 +281,15 @@ impl BottomPane<'_> {
         self.composer.on_file_search_result(query, matches);
         self.request_redraw();
     }
-
-    /// Set the rows and cap for the transient live ring overlay.
-    pub(crate) fn set_live_ring_rows(&mut self, max_rows: u16, rows: Vec<Line<'static>>) {
-        let mut w = live_ring_widget::LiveRingWidget::new();
-        w.set_max_rows(max_rows);
-        w.set_rows(rows);
-        self.live_ring = Some(w);
-    }
-
-    pub(crate) fn clear_live_ring(&mut self) {
-        self.live_ring = None;
-    }
-
-    // Removed restart_live_status_with_text – no longer used by the current streaming UI.
 }
 
 impl WidgetRef for &BottomPane<'_> {
     fn render_ref(&self, area: Rect, buf: &mut Buffer) {
-        let mut y_offset = 0u16;
-        if let Some(ring) = &self.live_ring {
-            let live_h = ring.desired_height(area.width).min(area.height);
-            if live_h > 0 {
-                let live_rect = Rect {
-                    x: area.x,
-                    y: area.y,
-                    width: area.width,
-                    height: live_h,
-                };
-                ring.render_ref(live_rect, buf);
-                y_offset = live_h;
-            }
-        }
-        // Spacer between live ring and status view when active
-        if self.live_ring.is_some() && self.status_view_active && y_offset < area.height {
-            // Leave one empty line
-            y_offset = y_offset.saturating_add(1);
-        }
-        if let Some(status) = &self.live_status {
-            let live_h = status.desired_height(area.width).min(area.height);
-            if live_h > 0 {
-                let live_rect = Rect {
-                    x: area.x,
-                    y: area.y,
-                    width: area.width,
-                    height: live_h,
-                };
-                status.render_ref(live_rect, buf);
-                y_offset = live_h;
-            }
-        }
-
-        if let Some(view) = &self.active_view {
-            if y_offset < area.height {
-                // Reserve bottom padding lines; keep at least 1 line for the view.
-                let avail = area.height - y_offset;
-                let pad = BottomPane::BOTTOM_PAD_LINES.min(avail.saturating_sub(1));
-                let view_rect = Rect {
-                    x: area.x,
-                    y: area.y + y_offset,
-                    width: area.width,
-                    height: avail - pad,
-                };
-                view.render(view_rect, buf);
-            }
-        } else if y_offset < area.height {
-            let composer_rect = Rect {
-                x: area.x,
-                y: area.y + y_offset,
-                width: area.width,
-                // Reserve bottom padding
-                height: (area.height - y_offset)
-                    - BottomPane::BOTTOM_PAD_LINES.min((area.height - y_offset).saturating_sub(1)),
-            };
-            (&self.composer).render_ref(composer_rect, buf);
+        // Show BottomPaneView if present.
+        if let Some(ov) = &self.active_view {
+            ov.render(area, buf);
+        } else {
+            (&self.composer).render_ref(area, buf);
         }
     }
 }
@@ -412,9 +298,6 @@ impl WidgetRef for &BottomPane<'_> {
 mod tests {
     use super::*;
     use crate::app_event::AppEvent;
-    use ratatui::buffer::Buffer;
-    use ratatui::layout::Rect;
-    use ratatui::text::Line;
     use std::path::PathBuf;
     use std::sync::mpsc::channel;
 
@@ -441,200 +324,4 @@ mod tests {
         assert!(pane.ctrl_c_quit_hint_visible());
         assert_eq!(CancellationEvent::Ignored, pane.on_ctrl_c());
     }
-
-    #[test]
-    fn live_ring_renders_above_composer() {
-        let (tx_raw, _rx) = channel::<AppEvent>();
-        let tx = AppEventSender::new(tx_raw);
-        let mut pane = BottomPane::new(BottomPaneParams {
-            app_event_tx: tx,
-            has_input_focus: true,
-            enhanced_keys_supported: false,
-        });
-
-        // Provide 4 rows with max_rows=3; only the last 3 should be visible.
-        pane.set_live_ring_rows(
-            3,
-            vec![
-                Line::from("one".to_string()),
-                Line::from("two".to_string()),
-                Line::from("three".to_string()),
-                Line::from("four".to_string()),
-            ],
-        );
-
-        let area = Rect::new(0, 0, 10, 5);
-        let mut buf = Buffer::empty(area);
-        (&pane).render_ref(area, &mut buf);
-
-        // Extract the first 3 rows and assert they contain the last three lines.
-        let mut lines: Vec<String> = Vec::new();
-        for y in 0..3 {
-            let mut s = String::new();
-            for x in 0..area.width {
-                s.push(buf[(x, y)].symbol().chars().next().unwrap_or(' '));
-            }
-            lines.push(s.trim_end().to_string());
-        }
-        assert_eq!(lines, vec!["two", "three", "four"]);
-    }
-
-    #[test]
-    fn status_indicator_visible_with_live_ring() {
-        let (tx_raw, _rx) = channel::<AppEvent>();
-        let tx = AppEventSender::new(tx_raw);
-        let mut pane = BottomPane::new(BottomPaneParams {
-            app_event_tx: tx,
-            has_input_focus: true,
-            enhanced_keys_supported: false,
-        });
-
-        // Simulate task running which replaces composer with the status indicator.
-        pane.set_task_running(true);
-        pane.update_status_text("waiting for model".to_string());
-
-        // Provide 2 rows in the live ring (e.g., streaming CoT) and ensure the
-        // status indicator remains visible below them.
-        pane.set_live_ring_rows(
-            2,
-            vec![
-                Line::from("cot1".to_string()),
-                Line::from("cot2".to_string()),
-            ],
-        );
-
-        // Allow some frames so the dot animation is present.
-        std::thread::sleep(std::time::Duration::from_millis(120));
-
-        // Height should include both ring rows, 1 spacer, and the 1-line status.
-        let area = Rect::new(0, 0, 30, 4);
-        let mut buf = Buffer::empty(area);
-        (&pane).render_ref(area, &mut buf);
-
-        // Top two rows are the live ring.
-        let mut r0 = String::new();
-        let mut r1 = String::new();
-        for x in 0..area.width {
-            r0.push(buf[(x, 0)].symbol().chars().next().unwrap_or(' '));
-            r1.push(buf[(x, 1)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert!(r0.contains("cot1"), "expected first live row: {r0:?}");
-        assert!(r1.contains("cot2"), "expected second live row: {r1:?}");
-
-        // Row 2 is the spacer (blank)
-        let mut r2 = String::new();
-        for x in 0..area.width {
-            r2.push(buf[(x, 2)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert!(r2.trim().is_empty(), "expected blank spacer line: {r2:?}");
-
-        // Bottom row is the status line; it should contain the left bar and "Working".
-        let mut r3 = String::new();
-        for x in 0..area.width {
-            r3.push(buf[(x, 3)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert_eq!(buf[(0, 3)].symbol().chars().next().unwrap_or(' '), '▌');
-        assert!(
-            r3.contains("Working"),
-            "expected Working header in status line: {r3:?}"
-        );
-    }
-
-    #[test]
-    fn bottom_padding_present_for_status_view() {
-        let (tx_raw, _rx) = channel::<AppEvent>();
-        let tx = AppEventSender::new(tx_raw);
-        let mut pane = BottomPane::new(BottomPaneParams {
-            app_event_tx: tx,
-            has_input_focus: true,
-            enhanced_keys_supported: false,
-        });
-
-        // Activate spinner (status view replaces composer) with no live ring.
-        pane.set_task_running(true);
-        pane.update_status_text("waiting for model".to_string());
-
-        // Use height == desired_height; expect 1 status row at top and 2 bottom padding rows.
-        let height = pane.desired_height(30);
-        assert!(
-            height >= 3,
-            "expected at least 3 rows with bottom padding; got {height}"
-        );
-        let area = Rect::new(0, 0, 30, height);
-        let mut buf = Buffer::empty(area);
-        (&pane).render_ref(area, &mut buf);
-
-        // Top row contains the status header
-        let mut top = String::new();
-        for x in 0..area.width {
-            top.push(buf[(x, 0)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert_eq!(buf[(0, 0)].symbol().chars().next().unwrap_or(' '), '▌');
-        assert!(
-            top.contains("Working"),
-            "expected Working header on top row: {top:?}"
-        );
-
-        // Bottom two rows are blank padding
-        let mut r_last = String::new();
-        let mut r_last2 = String::new();
-        for x in 0..area.width {
-            r_last.push(buf[(x, height - 1)].symbol().chars().next().unwrap_or(' '));
-            r_last2.push(buf[(x, height - 2)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert!(
-            r_last.trim().is_empty(),
-            "expected last row blank: {r_last:?}"
-        );
-        assert!(
-            r_last2.trim().is_empty(),
-            "expected second-to-last row blank: {r_last2:?}"
-        );
-    }
-
-    #[test]
-    fn bottom_padding_shrinks_when_tiny() {
-        let (tx_raw, _rx) = channel::<AppEvent>();
-        let tx = AppEventSender::new(tx_raw);
-        let mut pane = BottomPane::new(BottomPaneParams {
-            app_event_tx: tx,
-            has_input_focus: true,
-            enhanced_keys_supported: false,
-        });
-
-        pane.set_task_running(true);
-        pane.update_status_text("waiting for model".to_string());
-
-        // Height=2 → pad shrinks to 1; bottom row is blank, top row has spinner.
-        let area2 = Rect::new(0, 0, 20, 2);
-        let mut buf2 = Buffer::empty(area2);
-        (&pane).render_ref(area2, &mut buf2);
-        let mut row0 = String::new();
-        let mut row1 = String::new();
-        for x in 0..area2.width {
-            row0.push(buf2[(x, 0)].symbol().chars().next().unwrap_or(' '));
-            row1.push(buf2[(x, 1)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert!(
-            row0.contains("Working"),
-            "expected Working header on row 0: {row0:?}"
-        );
-        assert!(
-            row1.trim().is_empty(),
-            "expected bottom padding on row 1: {row1:?}"
-        );
-
-        // Height=1 → no padding; single row is the spinner.
-        let area1 = Rect::new(0, 0, 20, 1);
-        let mut buf1 = Buffer::empty(area1);
-        (&pane).render_ref(area1, &mut buf1);
-        let mut only = String::new();
-        for x in 0..area1.width {
-            only.push(buf1[(x, 0)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert!(
-            only.contains("Working"),
-            "expected Working header with no padding: {only:?}"
-        );
-    }
 }

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

@@ -210,7 +210,7 @@ impl TextArea {
                 ..
             } => self.insert_str(&c.to_string()),
             KeyEvent {
-                code: KeyCode::Char('j' | 'm'),
+                code: KeyCode::Char('j'),
                 modifiers: KeyModifiers::CONTROL,
                 ..
             }
@@ -220,22 +220,11 @@ impl TextArea {
             } => self.insert_str("\n"),
             KeyEvent {
                 code: KeyCode::Backspace,
-                modifiers: KeyModifiers::ALT,
-                ..
-            } => self.delete_backward_word(),
-            KeyEvent {
-                code: KeyCode::Backspace,
-                modifiers: KeyModifiers::NONE,
                 ..
             } => self.delete_backward(1),
             KeyEvent {
                 code: KeyCode::Delete,
                 ..
-            }
-            | KeyEvent {
-                code: KeyCode::Char('d'),
-                modifiers: KeyModifiers::CONTROL,
-                ..
             } => self.delete_forward(1),
 
             KeyEvent {
@@ -314,14 +303,14 @@ impl TextArea {
             }
             KeyEvent {
                 code: KeyCode::Left,
-                modifiers: KeyModifiers::CONTROL | KeyModifiers::ALT,
+                modifiers: KeyModifiers::CONTROL,
                 ..
             } => {
                 self.set_cursor(self.beginning_of_previous_word());
             }
             KeyEvent {
                 code: KeyCode::Right,
-                modifiers: KeyModifiers::CONTROL | KeyModifiers::ALT,
+                modifiers: KeyModifiers::CONTROL,
                 ..
             } => {
                 self.set_cursor(self.end_of_next_word());

codex-rs/tui/src/chatwidget.rs

@@ -26,6 +26,8 @@ use codex_core::protocol::TokenUsage;
 use crossterm::event::KeyEvent;
 use crossterm::event::KeyEventKind;
 use ratatui::buffer::Buffer;
+use ratatui::layout::Constraint;
+use ratatui::layout::Layout;
 use ratatui::layout::Rect;
 use ratatui::widgets::Widget;
 use ratatui::widgets::WidgetRef;
@@ -40,12 +42,11 @@ use crate::bottom_pane::CancellationEvent;
 use crate::bottom_pane::InputResult;
 use crate::exec_command::strip_bash_lc_and_escape;
 use crate::history_cell::CommandOutput;
+use crate::history_cell::DynamicHeightWidgetRef;
 use crate::history_cell::HistoryCell;
 use crate::history_cell::PatchEventType;
-use crate::live_wrap::RowBuilder;
 use crate::user_approval_widget::ApprovalRequest;
 use codex_file_search::FileMatch;
-use ratatui::style::Stylize;
 
 struct RunningCommand {
     command: Vec<String>,
@@ -57,6 +58,7 @@ pub(crate) struct ChatWidget<'a> {
     app_event_tx: AppEventSender,
     codex_op_tx: UnboundedSender<Op>,
     bottom_pane: BottomPane<'a>,
+    active_history_cell: Option<HistoryCell>,
     config: Config,
     initial_user_message: Option<UserMessage>,
     token_usage: TokenUsage,
@@ -66,10 +68,6 @@ pub(crate) struct ChatWidget<'a> {
     // at once into scrollback so the history contains a single message.
     answer_buffer: String,
     running_commands: HashMap<String, RunningCommand>,
-    live_builder: RowBuilder,
-    current_stream: Option<StreamKind>,
-    stream_header_emitted: bool,
-    live_max_rows: u16,
 }
 
 struct UserMessage {
@@ -77,12 +75,6 @@ struct UserMessage {
     image_paths: Vec<PathBuf>,
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-enum StreamKind {
-    Answer,
-    Reasoning,
-}
-
 impl From<String> for UserMessage {
     fn from(text: String) -> Self {
         Self {
@@ -154,6 +146,7 @@ impl ChatWidget<'_> {
                 has_input_focus: true,
                 enhanced_keys_supported,
             }),
+            active_history_cell: None,
             config,
             initial_user_message: create_initial_user_message(
                 initial_prompt.unwrap_or_default(),
@@ -163,15 +156,15 @@ impl ChatWidget<'_> {
             reasoning_buffer: String::new(),
             answer_buffer: String::new(),
             running_commands: HashMap::new(),
-            live_builder: RowBuilder::new(80),
-            current_stream: None,
-            stream_header_emitted: false,
-            live_max_rows: 3,
         }
     }
 
     pub fn desired_height(&self, width: u16) -> u16 {
         self.bottom_pane.desired_height(width)
+            + self
+                .active_history_cell
+                .as_ref()
+                .map_or(0, |c| c.desired_height(width))
     }
 
     pub(crate) fn handle_key_event(&mut self, key_event: KeyEvent) {
@@ -250,45 +243,58 @@ impl ChatWidget<'_> {
 
                 self.request_redraw();
             }
-            EventMsg::AgentMessage(AgentMessageEvent { message: _ }) => {
-                // Final assistant answer: commit all remaining rows and close with
-                // a blank line. Use the final text if provided, otherwise rely on
-                // streamed deltas already in the builder.
-                self.finalize_stream(StreamKind::Answer);
+            EventMsg::AgentMessage(AgentMessageEvent { message }) => {
+                // Final assistant answer. Prefer the fully provided message
+                // from the event; if it is empty fall back to any accumulated
+                // delta buffer (some providers may only stream deltas and send
+                // an empty final message).
+                let full = if message.is_empty() {
+                    std::mem::take(&mut self.answer_buffer)
+                } else {
+                    self.answer_buffer.clear();
+                    message
+                };
+                if !full.is_empty() {
+                    self.add_to_history(HistoryCell::new_agent_message(&self.config, full));
+                }
                 self.request_redraw();
             }
             EventMsg::AgentMessageDelta(AgentMessageDeltaEvent { delta }) => {
-                self.begin_stream(StreamKind::Answer);
+                // Buffer only – do not emit partial lines. This avoids cases
+                // where long responses appear truncated if the terminal
+                // wrapped early. The full message is emitted on
+                // AgentMessage.
                 self.answer_buffer.push_str(&delta);
-                self.stream_push_and_maybe_commit(&delta);
-                self.request_redraw();
             }
             EventMsg::AgentReasoningDelta(AgentReasoningDeltaEvent { delta }) => {
-                // Stream CoT into the live pane; keep input visible and commit
-                // overflow rows incrementally to scrollback.
-                self.begin_stream(StreamKind::Reasoning);
+                // Buffer only – disable incremental reasoning streaming so we
+                // avoid truncated intermediate lines. Full text emitted on
+                // AgentReasoning.
                 self.reasoning_buffer.push_str(&delta);
-                self.stream_push_and_maybe_commit(&delta);
-                self.request_redraw();
             }
-            EventMsg::AgentReasoning(AgentReasoningEvent { text: _ }) => {
-                // Final reasoning: commit remaining rows and close with a blank.
-                self.finalize_stream(StreamKind::Reasoning);
+            EventMsg::AgentReasoning(AgentReasoningEvent { text }) => {
+                // Emit full reasoning text once. Some providers might send
+                // final event with empty text if only deltas were used.
+                let full = if text.is_empty() {
+                    std::mem::take(&mut self.reasoning_buffer)
+                } else {
+                    self.reasoning_buffer.clear();
+                    text
+                };
+                if !full.is_empty() {
+                    self.add_to_history(HistoryCell::new_agent_reasoning(&self.config, full));
+                }
                 self.request_redraw();
             }
             EventMsg::TaskStarted => {
                 self.bottom_pane.clear_ctrl_c_quit_hint();
                 self.bottom_pane.set_task_running(true);
-                // Replace composer with single-line spinner while waiting.
-                self.bottom_pane
-                    .update_status_text("waiting for model".to_string());
                 self.request_redraw();
             }
             EventMsg::TaskComplete(TaskCompleteEvent {
                 last_agent_message: _,
             }) => {
                 self.bottom_pane.set_task_running(false);
-                self.bottom_pane.clear_live_ring();
                 self.request_redraw();
             }
             EventMsg::TokenCount(token_usage) => {
@@ -301,8 +307,8 @@ impl ChatWidget<'_> {
                 self.bottom_pane.set_task_running(false);
             }
             EventMsg::PlanUpdate(update) => {
-                // Commit plan updates directly to history (no status-line preview).
                 self.add_to_history(HistoryCell::new_plan_update(update));
+                self.request_redraw();
             }
             EventMsg::ExecApprovalRequest(ExecApprovalRequestEvent {
                 call_id: _,
@@ -310,7 +316,8 @@ impl ChatWidget<'_> {
                 cwd,
                 reason,
             }) => {
-                // Log a background summary immediately so the history is chronological.
+                // Print the command to the history so it is visible in the
+                // transcript *before* the modal asks for approval.
                 let cmdline = strip_bash_lc_and_escape(&command);
                 let text = format!(
                     "command requires approval:\n$ {cmdline}{reason}",
@@ -346,6 +353,7 @@ impl ChatWidget<'_> {
                 // approval dialog) and avoids surprising the user with a modal
                 // prompt before they have seen *what* is being requested.
                 // ------------------------------------------------------------------
+
                 self.add_to_history(HistoryCell::new_patch_event(
                     PatchEventType::ApprovalRequest,
                     changes,
@@ -372,14 +380,21 @@ impl ChatWidget<'_> {
                         cwd: cwd.clone(),
                     },
                 );
-                self.add_to_history(HistoryCell::new_active_exec_command(command));
+                self.active_history_cell = Some(HistoryCell::new_active_exec_command(
+                    command,
+                    self.app_event_tx.clone(),
+                ));
+            }
+            EventMsg::ExecCommandOutputDelta(_) => {
+                // TODO
             }
-            EventMsg::ExecCommandOutputDelta(_) => {}
             EventMsg::PatchApplyBegin(PatchApplyBeginEvent {
                 call_id: _,
                 auto_approved,
                 changes,
             }) => {
+                // Even when a patch is auto‑approved we still display the
+                // summary so the user can follow along.
                 self.add_to_history(HistoryCell::new_patch_event(
                     PatchEventType::ApplyBegin { auto_approved },
                     changes,
@@ -392,8 +407,8 @@ impl ChatWidget<'_> {
                 stdout,
                 stderr,
             }) => {
-                // Compute summary before moving stdout into the history cell.
                 let cmd = self.running_commands.remove(&call_id);
+                self.active_history_cell = None;
                 self.add_to_history(HistoryCell::new_completed_exec_command(
                     cmd.map(|cmd| cmd.command).unwrap_or_else(|| vec![call_id]),
                     CommandOutput {
@@ -442,15 +457,14 @@ impl ChatWidget<'_> {
                 self.app_event_tx.send(AppEvent::ExitRequest);
             }
             event => {
-                let text = format!("{event:?}");
-                self.add_to_history(HistoryCell::new_background_event(text.clone()));
-                self.update_latest_log(text);
+                self.add_to_history(HistoryCell::new_background_event(format!("{event:?}")));
             }
         }
     }
 
     /// Update the live log preview while a task is running.
     pub(crate) fn update_latest_log(&mut self, line: String) {
+        // Forward only if we are currently showing the status indicator.
         self.bottom_pane.update_status_text(line);
     }
 
@@ -476,6 +490,7 @@ impl ChatWidget<'_> {
             CancellationEvent::Ignored => {}
         }
         if self.bottom_pane.is_task_running() {
+            self.active_history_cell = None;
             self.bottom_pane.clear_ctrl_c_quit_hint();
             self.submit_op(Op::Interrupt);
             self.answer_buffer.clear();
@@ -512,107 +527,34 @@ impl ChatWidget<'_> {
     }
 
     pub fn cursor_pos(&self, area: Rect) -> Option<(u16, u16)> {
-        self.bottom_pane.cursor_pos(area)
-    }
-}
-
-impl ChatWidget<'_> {
-    fn begin_stream(&mut self, kind: StreamKind) {
-        if self.current_stream != Some(kind) {
-            self.current_stream = Some(kind);
-            self.stream_header_emitted = false;
-            // Clear any previous live content; we're starting a new stream.
-            self.live_builder = RowBuilder::new(self.live_builder.width());
-            // Ensure the waiting status is visible (composer replaced).
-            self.bottom_pane
-                .update_status_text("waiting for model".to_string());
-        }
-    }
-
-    fn stream_push_and_maybe_commit(&mut self, delta: &str) {
-        self.live_builder.push_fragment(delta);
-
-        // Commit overflow rows (small batches) while keeping the last N rows visible.
-        let drained = self
-            .live_builder
-            .drain_commit_ready(self.live_max_rows as usize);
-        if !drained.is_empty() {
-            let mut lines: Vec<ratatui::text::Line<'static>> = Vec::new();
-            if !self.stream_header_emitted {
-                match self.current_stream {
-                    Some(StreamKind::Reasoning) => {
-                        lines.push(ratatui::text::Line::from("thinking".magenta().italic()));
-                    }
-                    Some(StreamKind::Answer) => {
-                        lines.push(ratatui::text::Line::from("codex".magenta().bold()));
-                    }
-                    None => {}
-                }
-                self.stream_header_emitted = true;
-            }
-            for r in drained {
-                lines.push(ratatui::text::Line::from(r.text));
-            }
-            self.app_event_tx.send(AppEvent::InsertHistory(lines));
-        }
-
-        // Update the live ring overlay lines (text-only, newest at bottom).
-        let rows = self
-            .live_builder
-            .display_rows()
-            .into_iter()
-            .map(|r| ratatui::text::Line::from(r.text))
-            .collect::<Vec<_>>();
-        self.bottom_pane
-            .set_live_ring_rows(self.live_max_rows, rows);
-    }
-
-    fn finalize_stream(&mut self, kind: StreamKind) {
-        if self.current_stream != Some(kind) {
-            // Nothing to do; either already finalized or not the active stream.
-            return;
-        }
-        // Flush any partial line as a full row, then drain all remaining rows.
-        self.live_builder.end_line();
-        let remaining = self.live_builder.drain_rows();
-        // TODO: Re-add markdown rendering for assistant answers and reasoning.
-        // When finalizing, pass the accumulated text through `markdown::append_markdown`
-        // to build styled `Line<'static>` entries instead of raw plain text lines.
-        if !remaining.is_empty() || !self.stream_header_emitted {
-            let mut lines: Vec<ratatui::text::Line<'static>> = Vec::new();
-            if !self.stream_header_emitted {
-                match kind {
-                    StreamKind::Reasoning => {
-                        lines.push(ratatui::text::Line::from("thinking".magenta().italic()));
-                    }
-                    StreamKind::Answer => {
-                        lines.push(ratatui::text::Line::from("codex".magenta().bold()));
-                    }
-                }
-                self.stream_header_emitted = true;
-            }
-            for r in remaining {
-                lines.push(ratatui::text::Line::from(r.text));
-            }
-            // Close the block with a blank line for readability.
-            lines.push(ratatui::text::Line::from(""));
-            self.app_event_tx.send(AppEvent::InsertHistory(lines));
-        }
-
-        // Clear the live overlay and reset state for the next stream.
-        self.live_builder = RowBuilder::new(self.live_builder.width());
-        self.bottom_pane.clear_live_ring();
-        self.current_stream = None;
-        self.stream_header_emitted = false;
+        let [_, bottom_pane_area] = Layout::vertical([
+            Constraint::Max(
+                self.active_history_cell
+                    .as_ref()
+                    .map_or(0, |c| c.desired_height(area.width)),
+            ),
+            Constraint::Min(self.bottom_pane.desired_height(area.width)),
+        ])
+        .areas(area);
+        self.bottom_pane.cursor_pos(bottom_pane_area)
     }
 }
 
 impl WidgetRef for &ChatWidget<'_> {
     fn render_ref(&self, area: Rect, buf: &mut Buffer) {
-        // In the hybrid inline viewport mode we only draw the interactive
-        // bottom pane; history entries are injected directly into scrollback
-        // via `Terminal::insert_before`.
-        (&self.bottom_pane).render(area, buf);
+        let [active_cell_area, bottom_pane_area] = Layout::vertical([
+            Constraint::Max(
+                self.active_history_cell
+                    .as_ref()
+                    .map_or(0, |c| c.desired_height(area.width)),
+            ),
+            Constraint::Min(self.bottom_pane.desired_height(area.width)),
+        ])
+        .areas(area);
+        (&self.bottom_pane).render(bottom_pane_area, buf);
+        if let Some(cell) = &self.active_history_cell {
+            cell.render_ref(active_cell_area, buf);
+        }
     }
 }
 

codex-rs/tui/src/history_cell.rs

@@ -1,4 +1,5 @@
 use crate::exec_command::strip_bash_lc_and_escape;
+use crate::markdown::append_markdown;
 use crate::text_block::TextBlock;
 use crate::text_formatting::format_and_truncate_tool_result;
 use base64::Engine;
@@ -24,12 +25,19 @@ use ratatui::style::Modifier;
 use ratatui::style::Style;
 use ratatui::text::Line as RtLine;
 use ratatui::text::Span as RtSpan;
+use ratatui::widgets::Paragraph;
+use ratatui::widgets::WidgetRef;
+use ratatui::widgets::Wrap;
 use std::collections::HashMap;
 use std::io::Cursor;
 use std::path::PathBuf;
 use std::time::Duration;
 use tracing::error;
 
+use crate::app_event::AppEvent;
+use crate::app_event_sender::AppEventSender;
+use crate::shimmer_text::shimmer_spans;
+
 pub(crate) struct CommandOutput {
     pub(crate) exit_code: i32,
     pub(crate) stdout: String,
@@ -67,9 +75,14 @@ pub(crate) enum HistoryCell {
     /// Message from the user.
     UserPrompt { view: TextBlock },
 
-    // AgentMessage and AgentReasoning variants were unused and have been removed.
+    /// Message from the agent.
+    AgentMessage { view: TextBlock },
+
+    /// Reasoning event from the agent.
+    AgentReasoning { view: TextBlock },
+
     /// An exec tool call that has not finished yet.
-    ActiveExecCommand { view: TextBlock },
+    ActiveExecCommand { view: ActiveExecCommandView },
 
     /// Completed exec tool call.
     CompletedExecCommand { view: TextBlock },
@@ -114,6 +127,10 @@ pub(crate) enum HistoryCell {
 
 const TOOL_CALL_MAX_LINES: usize = 5;
 
+pub trait DynamicHeightWidgetRef: WidgetRef {
+    fn desired_height(&self, width: u16) -> u16;
+}
+
 impl HistoryCell {
     /// Return a cloned, plain representation of the cell's lines suitable for
     /// one‑shot insertion into the terminal scrollback. Image cells are
@@ -122,6 +139,8 @@ impl HistoryCell {
         match self {
             HistoryCell::WelcomeMessage { view }
             | HistoryCell::UserPrompt { view }
+            | HistoryCell::AgentMessage { view }
+            | HistoryCell::AgentReasoning { view }
             | HistoryCell::BackgroundEvent { view }
             | HistoryCell::GitDiffOutput { view }
             | HistoryCell::ErrorEvent { view }
@@ -130,16 +149,46 @@ impl HistoryCell {
             | HistoryCell::CompletedMcpToolCall { view }
             | HistoryCell::PendingPatch { view }
             | HistoryCell::PlanUpdate { view }
-            | HistoryCell::ActiveExecCommand { view, .. }
             | HistoryCell::ActiveMcpToolCall { view, .. } => {
                 view.lines.iter().map(line_to_static).collect()
             }
+            HistoryCell::ActiveExecCommand { view, .. } => {
+                let lines: Vec<Line<'static>> = vec![
+                    Line::from(vec!["command".magenta(), " running...".dim()]),
+                    Line::from(format!("$ {}", view.command)),
+                    Line::from(""),
+                ];
+                lines.iter().map(line_to_static).collect()
+            }
             HistoryCell::CompletedMcpToolCallWithImageOutput { .. } => vec![
                 Line::from("tool result (image output omitted)"),
                 Line::from(""),
             ],
         }
     }
+
+    fn view(&self) -> Box<dyn DynamicHeightWidgetRef + '_> {
+        match self {
+            HistoryCell::WelcomeMessage { view }
+            | HistoryCell::UserPrompt { view }
+            | HistoryCell::AgentMessage { view }
+            | HistoryCell::AgentReasoning { view }
+            | HistoryCell::BackgroundEvent { view }
+            | HistoryCell::GitDiffOutput { view }
+            | HistoryCell::ErrorEvent { view }
+            | HistoryCell::SessionInfo { view }
+            | HistoryCell::CompletedExecCommand { view }
+            | HistoryCell::CompletedMcpToolCall { view }
+            | HistoryCell::PendingPatch { view }
+            | HistoryCell::PlanUpdate { view }
+            | HistoryCell::ActiveMcpToolCall { view, .. } => Box::new(view),
+            HistoryCell::ActiveExecCommand { view, .. } => Box::new(view),
+            HistoryCell::CompletedMcpToolCallWithImageOutput { .. } => {
+                panic!("view() called on image output cell")
+            }
+        }
+    }
+
     pub(crate) fn new_session_info(
         config: &Config,
         event: SessionConfiguredEvent,
@@ -223,17 +272,36 @@ impl HistoryCell {
         }
     }
 
-    pub(crate) fn new_active_exec_command(command: Vec<String>) -> Self {
+    pub(crate) fn new_agent_message(config: &Config, message: String) -> Self {
+        let mut lines: Vec<Line<'static>> = Vec::new();
+        lines.push(Line::from("codex".magenta().bold()));
+        append_markdown(&message, &mut lines, config);
+        lines.push(Line::from(""));
+
+        HistoryCell::AgentMessage {
+            view: TextBlock::new(lines),
+        }
+    }
+
+    pub(crate) fn new_agent_reasoning(config: &Config, text: String) -> Self {
+        let mut lines: Vec<Line<'static>> = Vec::new();
+        lines.push(Line::from("thinking".magenta().italic()));
+        append_markdown(&text, &mut lines, config);
+        lines.push(Line::from(""));
+
+        HistoryCell::AgentReasoning {
+            view: TextBlock::new(lines),
+        }
+    }
+
+    pub(crate) fn new_active_exec_command(
+        command: Vec<String>,
+        app_event_tx: AppEventSender,
+    ) -> Self {
         let command_escaped = strip_bash_lc_and_escape(&command);
 
-        let lines: Vec<Line<'static>> = vec![
-            Line::from(vec!["command".magenta(), " running...".dim()]),
-            Line::from(format!("$ {command_escaped}")),
-            Line::from(""),
-        ];
-
         HistoryCell::ActiveExecCommand {
-            view: TextBlock::new(lines),
+            view: ActiveExecCommandView::new(command_escaped, app_event_tx),
         }
     }
 
@@ -601,6 +669,62 @@ impl HistoryCell {
     }
 }
 
+impl DynamicHeightWidgetRef for &HistoryCell {
+    fn desired_height(&self, width: u16) -> u16 {
+        self.view().desired_height(width)
+    }
+}
+
+impl WidgetRef for &HistoryCell {
+    fn render_ref(&self, area: Rect, buf: &mut Buffer) {
+        self.view().render_ref(area, buf);
+    }
+}
+
+pub(crate) struct ActiveExecCommandView {
+    command: String,
+    _app_event_tx: AppEventSender,
+}
+
+impl ActiveExecCommandView {
+    fn new(command: String, app_event_tx: AppEventSender) -> Self {
+        Self {
+            command,
+            _app_event_tx: app_event_tx,
+        }
+    }
+}
+
+impl DynamicHeightWidgetRef for &ActiveExecCommandView {
+    fn desired_height(&self, width: u16) -> u16 {
+        let lines: Vec<Line<'static>> = vec![
+            Line::from("Running command"),
+            Line::from(format!("$ {}", self.command)),
+            Line::from(""),
+        ];
+        Paragraph::new(Text::from(lines))
+            .wrap(Wrap { trim: false })
+            .line_count(width)
+            .try_into()
+            .unwrap_or(0)
+    }
+}
+impl WidgetRef for &ActiveExecCommandView {
+    fn render_ref(&self, area: Rect, buf: &mut Buffer) {
+        // Schedule a one-shot next frame to continue the shimmer.
+        self._app_event_tx
+            .send(AppEvent::ScheduleFrameIn(Duration::from_millis(100)));
+        let lines: Vec<Line<'static>> = vec![
+            Line::from(shimmer_spans("Running command")),
+            Line::from(format!("$ {}", self.command)),
+            Line::from(""),
+        ];
+        Paragraph::new(Text::from(lines))
+            .wrap(Wrap { trim: false })
+            .render(area, buf);
+    }
+}
+
 fn create_diff_summary(changes: HashMap<PathBuf, FileChange>) -> Vec<String> {
     // Build a concise, human‑readable summary list similar to the
     // `git status` short format so the user can reason about the

codex-rs/tui/src/insert_history.rs

@@ -14,6 +14,7 @@ use crossterm::style::SetBackgroundColor;
 use crossterm::style::SetColors;
 use crossterm::style::SetForegroundColor;
 use ratatui::layout::Size;
+use ratatui::prelude::Backend;
 use ratatui::style::Color;
 use ratatui::style::Modifier;
 use ratatui::text::Line;
@@ -21,20 +22,6 @@ use ratatui::text::Span;
 
 /// Insert `lines` above the viewport.
 pub(crate) fn insert_history_lines(terminal: &mut tui::Tui, lines: Vec<Line>) {
-    let mut out = std::io::stdout();
-    insert_history_lines_to_writer(terminal, &mut out, lines);
-}
-
-/// Like `insert_history_lines`, but writes ANSI to the provided writer. This
-/// is intended for testing where a capture buffer is used instead of stdout.
-pub fn insert_history_lines_to_writer<B, W>(
-    terminal: &mut crate::custom_terminal::Terminal<B>,
-    writer: &mut W,
-    lines: Vec<Line>,
-) where
-    B: ratatui::backend::Backend,
-    W: Write,
-{
     let screen_size = terminal.backend().size().unwrap_or(Size::new(0, 0));
     let cursor_pos = terminal.get_cursor_position().ok();
 
@@ -45,22 +32,10 @@ pub fn insert_history_lines_to_writer<B, W>(
         // If the viewport is not at the bottom of the screen, scroll it down to make room.
         // Don't scroll it past the bottom of the screen.
         let scroll_amount = wrapped_lines.min(screen_size.height - area.bottom());
-
-        // Emit ANSI to scroll the lower region (from the top of the viewport to the bottom
-        // of the screen) downward by `scroll_amount` lines. We do this by:
-        //   1) Limiting the scroll region to [area.top()+1 .. screen_height] (1-based bounds)
-        //   2) Placing the cursor at the top margin of that region
-        //   3) Emitting Reverse Index (RI, ESC M) `scroll_amount` times
-        //   4) Resetting the scroll region back to full screen
-        let top_1based = area.top() + 1; // Convert 0-based row to 1-based for DECSTBM
-        queue!(writer, SetScrollRegion(top_1based..screen_size.height)).ok();
-        queue!(writer, MoveTo(0, area.top())).ok();
-        for _ in 0..scroll_amount {
-            // Reverse Index (RI): ESC M
-            queue!(writer, Print("\x1bM")).ok();
-        }
-        queue!(writer, ResetScrollRegion).ok();
-
+        terminal
+            .backend_mut()
+            .scroll_region_down(area.top()..screen_size.height, scroll_amount)
+            .ok();
         let cursor_top = area.top().saturating_sub(1);
         area.y += scroll_amount;
         terminal.set_viewport_area(area);
@@ -84,23 +59,23 @@ pub fn insert_history_lines_to_writer<B, W>(
     // ││                            ││
     // │╰────────────────────────────╯│
     // └──────────────────────────────┘
-    queue!(writer, SetScrollRegion(1..area.top())).ok();
+    queue!(std::io::stdout(), SetScrollRegion(1..area.top())).ok();
 
     // NB: we are using MoveTo instead of set_cursor_position here to avoid messing with the
     // terminal's last_known_cursor_position, which hopefully will still be accurate after we
     // fetch/restore the cursor position. insert_history_lines should be cursor-position-neutral :)
-    queue!(writer, MoveTo(0, cursor_top)).ok();
+    queue!(std::io::stdout(), MoveTo(0, cursor_top)).ok();
 
     for line in lines {
-        queue!(writer, Print("\r\n")).ok();
-        write_spans(writer, line.iter()).ok();
+        queue!(std::io::stdout(), Print("\r\n")).ok();
+        write_spans(&mut std::io::stdout(), line.iter()).ok();
     }
 
-    queue!(writer, ResetScrollRegion).ok();
+    queue!(std::io::stdout(), ResetScrollRegion).ok();
 
     // Restore the cursor position to where it was before we started.
     if let Some(cursor_pos) = cursor_pos {
-        queue!(writer, MoveTo(cursor_pos.x, cursor_pos.y)).ok();
+        queue!(std::io::stdout(), MoveTo(cursor_pos.x, cursor_pos.y)).ok();
     }
 }
 
@@ -113,25 +88,19 @@ fn wrapped_line_count(lines: &[Line], width: u16) -> u16 {
 }
 
 fn line_height(line: &Line, width: u16) -> u16 {
-    // Use the same visible-width slicing semantics as the live row builder so
-    // our pre-scroll estimation matches how rows will actually wrap.
-    let w = width.max(1) as usize;
-    let mut rows = 0u16;
-    let mut remaining = line
+    use unicode_width::UnicodeWidthStr;
+    // get the total display width of the line, accounting for double-width chars
+    let total_width = line
         .spans
         .iter()
-        .map(|s| s.content.as_ref())
-        .collect::<Vec<_>>()
-        .join("");
-    while !remaining.is_empty() {
-        let (_prefix, suffix, taken) = crate::live_wrap::take_prefix_by_width(&remaining, w);
-        rows = rows.saturating_add(1);
-        if taken >= remaining.len() {
-            break;
-        }
-        remaining = suffix.to_string();
+        .map(|span| span.content.width())
+        .sum::<usize>();
+    // divide by width to get the number of lines, rounding up
+    if width == 0 {
+        1
+    } else {
+        (total_width as u16).div_ceil(width).max(1)
     }
-    rows.max(1)
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -314,12 +283,4 @@ mod tests {
             String::from_utf8(expected).unwrap()
         );
     }
-
-    #[test]
-    fn line_height_counts_double_width_emoji() {
-        let line = Line::from("😀😀😀"); // each emoji ~ width 2
-        assert_eq!(line_height(&line, 4), 2);
-        assert_eq!(line_height(&line, 2), 3);
-        assert_eq!(line_height(&line, 6), 1);
-    }
 }

codex-rs/tui/src/lib.rs

@@ -25,16 +25,16 @@ mod bottom_pane;
 mod chatwidget;
 mod citation_regex;
 mod cli;
-pub mod custom_terminal;
+mod custom_terminal;
 mod exec_command;
 mod file_search;
 mod get_git_diff;
 mod git_warning_screen;
 mod history_cell;
-pub mod insert_history;
-pub mod live_wrap;
+mod insert_history;
 mod log_layer;
 mod markdown;
+mod shimmer_text;
 mod slash_command;
 mod status_indicator_widget;
 mod text_block;

codex-rs/tui/src/live_wrap.rs

@@ -1,290 +0,0 @@
-use unicode_width::UnicodeWidthChar;
-use unicode_width::UnicodeWidthStr;
-
-/// A single visual row produced by RowBuilder.
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct Row {
-    pub text: String,
-    /// True if this row ends with an explicit line break (as opposed to a hard wrap).
-    pub explicit_break: bool,
-}
-
-impl Row {
-    pub fn width(&self) -> usize {
-        self.text.width()
-    }
-}
-
-/// Incrementally wraps input text into visual rows of at most `width` cells.
-///
-/// Step 1: plain-text only. ANSI-carry and styled spans will be added later.
-pub struct RowBuilder {
-    target_width: usize,
-    /// Buffer for the current logical line (until a '\n' is seen).
-    current_line: String,
-    /// Output rows built so far for the current logical line and previous ones.
-    rows: Vec<Row>,
-}
-
-impl RowBuilder {
-    pub fn new(target_width: usize) -> Self {
-        Self {
-            target_width: target_width.max(1),
-            current_line: String::new(),
-            rows: Vec::new(),
-        }
-    }
-
-    pub fn width(&self) -> usize {
-        self.target_width
-    }
-
-    pub fn set_width(&mut self, width: usize) {
-        self.target_width = width.max(1);
-        // Rewrap everything we have (simple approach for Step 1).
-        let mut all = String::new();
-        for row in self.rows.drain(..) {
-            all.push_str(&row.text);
-            if row.explicit_break {
-                all.push('\n');
-            }
-        }
-        all.push_str(&self.current_line);
-        self.current_line.clear();
-        self.push_fragment(&all);
-    }
-
-    /// Push an input fragment. May contain newlines.
-    pub fn push_fragment(&mut self, fragment: &str) {
-        if fragment.is_empty() {
-            return;
-        }
-        let mut start = 0usize;
-        for (i, ch) in fragment.char_indices() {
-            if ch == '\n' {
-                // Flush anything pending before the newline.
-                if start < i {
-                    self.current_line.push_str(&fragment[start..i]);
-                }
-                self.flush_current_line(true);
-                start = i + ch.len_utf8();
-            }
-        }
-        if start < fragment.len() {
-            self.current_line.push_str(&fragment[start..]);
-            self.wrap_current_line();
-        }
-    }
-
-    /// Mark the end of the current logical line (equivalent to pushing a '\n').
-    pub fn end_line(&mut self) {
-        self.flush_current_line(true);
-    }
-
-    /// Drain and return all produced rows.
-    pub fn drain_rows(&mut self) -> Vec<Row> {
-        std::mem::take(&mut self.rows)
-    }
-
-    /// Return a snapshot of produced rows (non-draining).
-    pub fn rows(&self) -> &[Row] {
-        &self.rows
-    }
-
-    /// Rows suitable for display, including the current partial line if any.
-    pub fn display_rows(&self) -> Vec<Row> {
-        let mut out = self.rows.clone();
-        if !self.current_line.is_empty() {
-            out.push(Row {
-                text: self.current_line.clone(),
-                explicit_break: false,
-            });
-        }
-        out
-    }
-
-    /// Drain the oldest rows that exceed `max_keep` display rows (including the
-    /// current partial line, if any). Returns the drained rows in order.
-    pub fn drain_commit_ready(&mut self, max_keep: usize) -> Vec<Row> {
-        let display_count = self.rows.len() + if self.current_line.is_empty() { 0 } else { 1 };
-        if display_count <= max_keep {
-            return Vec::new();
-        }
-        let to_commit = display_count - max_keep;
-        let commit_count = to_commit.min(self.rows.len());
-        let mut drained = Vec::with_capacity(commit_count);
-        for _ in 0..commit_count {
-            drained.push(self.rows.remove(0));
-        }
-        drained
-    }
-
-    fn flush_current_line(&mut self, explicit_break: bool) {
-        // Wrap any remaining content in the current line and then finalize with explicit_break.
-        self.wrap_current_line();
-        // If the current line ended exactly on a width boundary and is non-empty, represent
-        // the explicit break as an empty explicit row so that fragmentation invariance holds.
-        if explicit_break {
-            if self.current_line.is_empty() {
-                // We ended on a boundary previously; add an empty explicit row.
-                self.rows.push(Row {
-                    text: String::new(),
-                    explicit_break: true,
-                });
-            } else {
-                // There is leftover content that did not wrap yet; push it now with the explicit flag.
-                let mut s = String::new();
-                std::mem::swap(&mut s, &mut self.current_line);
-                self.rows.push(Row {
-                    text: s,
-                    explicit_break: true,
-                });
-            }
-        }
-        // Reset current line buffer for next logical line.
-        self.current_line.clear();
-    }
-
-    fn wrap_current_line(&mut self) {
-        // While the current_line exceeds width, cut a prefix.
-        loop {
-            if self.current_line.is_empty() {
-                break;
-            }
-            let (prefix, suffix, taken) =
-                take_prefix_by_width(&self.current_line, self.target_width);
-            if taken == 0 {
-                // Avoid infinite loop on pathological inputs; take one scalar and continue.
-                if let Some((i, ch)) = self.current_line.char_indices().next() {
-                    let len = i + ch.len_utf8();
-                    let p = self.current_line[..len].to_string();
-                    self.rows.push(Row {
-                        text: p,
-                        explicit_break: false,
-                    });
-                    self.current_line = self.current_line[len..].to_string();
-                    continue;
-                }
-                break;
-            }
-            if suffix.is_empty() {
-                // Fits entirely; keep in buffer (do not push yet) so we can append more later.
-                break;
-            } else {
-                // Emit wrapped prefix as a non-explicit row and continue with the remainder.
-                self.rows.push(Row {
-                    text: prefix,
-                    explicit_break: false,
-                });
-                self.current_line = suffix.to_string();
-            }
-        }
-    }
-}
-
-/// Take a prefix of `text` whose visible width is at most `max_cols`.
-/// Returns (prefix, suffix, prefix_width).
-pub fn take_prefix_by_width(text: &str, max_cols: usize) -> (String, &str, usize) {
-    if max_cols == 0 || text.is_empty() {
-        return (String::new(), text, 0);
-    }
-    let mut cols = 0usize;
-    let mut end_idx = 0usize;
-    for (i, ch) in text.char_indices() {
-        let ch_width = UnicodeWidthChar::width(ch).unwrap_or(0);
-        if cols.saturating_add(ch_width) > max_cols {
-            break;
-        }
-        cols += ch_width;
-        end_idx = i + ch.len_utf8();
-        if cols == max_cols {
-            break;
-        }
-    }
-    let prefix = text[..end_idx].to_string();
-    let suffix = &text[end_idx..];
-    (prefix, suffix, cols)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use pretty_assertions::assert_eq;
-
-    #[test]
-    fn rows_do_not_exceed_width_ascii() {
-        let mut rb = RowBuilder::new(10);
-        rb.push_fragment("hello whirl this is a test");
-        let rows = rb.rows().to_vec();
-        assert_eq!(
-            rows,
-            vec![
-                Row {
-                    text: "hello whir".to_string(),
-                    explicit_break: false
-                },
-                Row {
-                    text: "l this is ".to_string(),
-                    explicit_break: false
-                }
-            ]
-        );
-    }
-
-    #[test]
-    fn rows_do_not_exceed_width_emoji_cjk() {
-        // 😀 is width 2; 你/好 are width 2.
-        let mut rb = RowBuilder::new(6);
-        rb.push_fragment("😀😀 你好");
-        let rows = rb.rows().to_vec();
-        // At width 6, we expect the first row to fit exactly two emojis and a space
-        // (2 + 2 + 1 = 5) plus one more column for the first CJK char (2 would overflow),
-        // so only the two emojis and the space fit; the rest remains buffered.
-        assert_eq!(
-            rows,
-            vec![Row {
-                text: "😀😀 ".to_string(),
-                explicit_break: false
-            }]
-        );
-    }
-
-    #[test]
-    fn fragmentation_invariance_long_token() {
-        let s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; // 26 chars
-        let mut rb_all = RowBuilder::new(7);
-        rb_all.push_fragment(s);
-        let all_rows = rb_all.rows().to_vec();
-
-        let mut rb_chunks = RowBuilder::new(7);
-        for i in (0..s.len()).step_by(3) {
-            let end = (i + 3).min(s.len());
-            rb_chunks.push_fragment(&s[i..end]);
-        }
-        let chunk_rows = rb_chunks.rows().to_vec();
-
-        assert_eq!(all_rows, chunk_rows);
-    }
-
-    #[test]
-    fn newline_splits_rows() {
-        let mut rb = RowBuilder::new(10);
-        rb.push_fragment("hello\nworld");
-        let rows = rb.display_rows();
-        assert!(rows.iter().any(|r| r.explicit_break));
-        assert_eq!(rows[0].text, "hello");
-        // Second row should begin with 'world'
-        assert!(rows.iter().any(|r| r.text.starts_with("world")));
-    }
-
-    #[test]
-    fn rewrap_on_width_change() {
-        let mut rb = RowBuilder::new(10);
-        rb.push_fragment("abcdefghijK");
-        assert!(!rb.rows().is_empty());
-        rb.set_width(5);
-        for r in rb.rows() {
-            assert!(r.width() <= 5);
-        }
-    }
-}

codex-rs/tui/src/markdown.rs

@@ -1,4 +1,3 @@
-use crate::citation_regex::CITATION_REGEX;
 use codex_core::config::Config;
 use codex_core::config_types::UriBasedFileOpener;
 use ratatui::text::Line;
@@ -6,7 +5,8 @@ use ratatui::text::Span;
 use std::borrow::Cow;
 use std::path::Path;
 
-#[allow(dead_code)]
+use crate::citation_regex::CITATION_REGEX;
+
 pub(crate) fn append_markdown(
     markdown_source: &str,
     lines: &mut Vec<Line<'static>>,
@@ -15,7 +15,6 @@ pub(crate) fn append_markdown(
     append_markdown_with_opener_and_cwd(markdown_source, lines, config.file_opener, &config.cwd);
 }
 
-#[allow(dead_code)]
 fn append_markdown_with_opener_and_cwd(
     markdown_source: &str,
     lines: &mut Vec<Line<'static>>,
@@ -61,7 +60,6 @@ fn append_markdown_with_opener_and_cwd(
 /// ```text
 /// <scheme>://file<ABS_PATH>:<LINE>
 /// ```
-#[allow(dead_code)]
 fn rewrite_file_citations<'a>(
     src: &'a str,
     file_opener: UriBasedFileOpener,

codex-rs/tui/src/shimmer_text.rs

@@ -0,0 +1,97 @@
+use std::sync::OnceLock;
+use std::time::Duration;
+use std::time::Instant;
+
+use ratatui::style::Color;
+use ratatui::style::Modifier;
+use ratatui::style::Style;
+use ratatui::text::Span;
+
+static PROCESS_START: OnceLock<Instant> = OnceLock::new();
+
+/// Ensure the process start time is initialized. Call early in app startup
+/// so all animations key off a common origin.
+pub(crate) fn init_process_start() {
+    let _ = PROCESS_START.set(Instant::now());
+}
+
+fn elapsed_since_start() -> Duration {
+    let start = PROCESS_START.get_or_init(Instant::now);
+    start.elapsed()
+}
+
+/// Compute grayscale shimmer spans for the provided text based on elapsed
+/// time since process start. Uses a cosine falloff across a small band to
+/// achieve a smooth highlight that sweeps across the text.
+pub(crate) fn shimmer_spans(text: &str) -> Vec<Span<'static>> {
+    let header_chars: Vec<char> = text.chars().collect();
+
+    // Synchronize the shimmer so that all instances start at the beginning
+    // and reach the end at the same time, regardless of length. We achieve
+    // this by mapping elapsed time into a global sweep fraction in [0, 1),
+    // then scaling that fraction across the character indices of this text.
+    // The bright band width (in characters) remains constant.
+    let len = header_chars.len();
+    if len == 0 {
+        return Vec::new();
+    }
+
+    // Width of the bright band (in characters).
+    let band_half_width = (len as f32) / 4.0;
+
+    // Use character-based padding: pretend the string is longer by
+    // `PADDING * 2` characters and move at a constant velocity over time.
+    // We compute the cycle duration in time (including pre/post time derived
+    // from character padding at constant velocity) and wrap using time modulo
+    // rather than modulo on character distance.
+    const SWEEP_SECONDS: f32 = 1.5; // time to traverse the visible text
+    let PADDING: f32 = band_half_width;
+    let elapsed = elapsed_since_start().as_secs_f32();
+    let pos = (elapsed % SWEEP_SECONDS) / SWEEP_SECONDS * (len as f32 + PADDING * 2.0) - PADDING;
+
+    let has_true_color = supports_color::on_cached(supports_color::Stream::Stdout)
+        .map(|level| level.has_16m)
+        .unwrap_or(false);
+
+    let mut header_spans: Vec<Span<'static>> = Vec::with_capacity(header_chars.len());
+    for (i, ch) in header_chars.iter().enumerate() {
+        let i_pos = i as f32;
+        let dist = (i_pos - pos).abs();
+
+        let t = if dist <= band_half_width {
+            let x = std::f32::consts::PI * (dist / band_half_width);
+            0.5 * (1.0 + x.cos())
+        } else {
+            0.0
+        };
+
+        let brightness = 0.4 + 0.6 * t;
+        let level = (brightness * 255.0).clamp(0.0, 255.0) as u8;
+        let style = if has_true_color {
+            Style::default()
+                .fg(Color::Rgb(level, level, level))
+                .add_modifier(Modifier::BOLD)
+        } else {
+            // Bold makes dark gray and gray look the same, so don't use it
+            // when true color is not supported.
+            Style::default().fg(color_for_level(level))
+        };
+
+        header_spans.push(Span::styled(ch.to_string(), style));
+    }
+
+    header_spans
+}
+
+//
+
+/// Utility used for 16-color terminals to approximate grayscale.
+pub(crate) fn color_for_level(level: u8) -> Color {
+    if level < 128 {
+        Color::DarkGray
+    } else if level < 192 {
+        Color::Gray
+    } else {
+        Color::White
+    }
+}

codex-rs/tui/src/status_indicator_widget.rs

@@ -1,84 +1,43 @@
 //! A live status indicator that shows the *latest* log line emitted by the
 //! application while the agent is processing a long‑running task.
 
-use std::sync::Arc;
-use std::sync::atomic::AtomicBool;
-use std::sync::atomic::AtomicUsize;
-use std::sync::atomic::Ordering;
-use std::thread;
 use std::time::Duration;
 
 use ratatui::buffer::Buffer;
+use ratatui::layout::Alignment;
 use ratatui::layout::Rect;
 use ratatui::style::Color;
 use ratatui::style::Modifier;
 use ratatui::style::Style;
+use ratatui::style::Stylize;
 use ratatui::text::Line;
 use ratatui::text::Span;
+use ratatui::widgets::Block;
+use ratatui::widgets::BorderType;
+use ratatui::widgets::Borders;
+use ratatui::widgets::Padding;
 use ratatui::widgets::Paragraph;
 use ratatui::widgets::WidgetRef;
-use unicode_width::UnicodeWidthStr;
 
 use crate::app_event::AppEvent;
 use crate::app_event_sender::AppEventSender;
+use crate::shimmer_text::shimmer_spans;
 
-// We render the live text using markdown so it visually matches the history
-// cells. Before rendering we strip any ANSI escape sequences to avoid writing
-// raw control bytes into the back buffer.
 use codex_ansi_escape::ansi_escape_line;
 
 pub(crate) struct StatusIndicatorWidget {
     /// Latest text to display (truncated to the available width at render
     /// time).
     text: String,
-
-    /// Animation state: reveal target `text` progressively like a typewriter.
-    /// We compute the currently visible prefix length based on the current
-    /// frame index and a constant typing speed.  The `base_frame` and
-    /// `reveal_len_at_base` form the anchor from which we advance.
-    last_target_len: usize,
-    base_frame: usize,
-    reveal_len_at_base: usize,
-
-    frame_idx: Arc<AtomicUsize>,
-    running: Arc<AtomicBool>,
-    // Keep one sender alive to prevent the channel from closing while the
-    // animation thread is still running. The field itself is currently not
-    // accessed anywhere, therefore the leading underscore silences the
-    // `dead_code` warning without affecting behavior.
+    // Keep one sender alive for scheduling frames.
     _app_event_tx: AppEventSender,
 }
 
 impl StatusIndicatorWidget {
     /// Create a new status indicator and start the animation timer.
     pub(crate) fn new(app_event_tx: AppEventSender) -> Self {
-        let frame_idx = Arc::new(AtomicUsize::new(0));
-        let running = Arc::new(AtomicBool::new(true));
-
-        // Animation thread.
-        {
-            let frame_idx_clone = Arc::clone(&frame_idx);
-            let running_clone = Arc::clone(&running);
-            let app_event_tx_clone = app_event_tx.clone();
-            thread::spawn(move || {
-                let mut counter = 0usize;
-                while running_clone.load(Ordering::Relaxed) {
-                    std::thread::sleep(Duration::from_millis(100));
-                    counter = counter.wrapping_add(1);
-                    frame_idx_clone.store(counter, Ordering::Relaxed);
-                    app_event_tx_clone.send(AppEvent::RequestRedraw);
-                }
-            });
-        }
-
         Self {
-            text: String::from("waiting for model"),
-            last_target_len: 0,
-            base_frame: 0,
-            reveal_len_at_base: 0,
-            frame_idx,
-            running,
-
+            text: String::from("waiting for logs…"),
             _app_event_tx: app_event_tx,
         }
     }
@@ -89,213 +48,74 @@ impl StatusIndicatorWidget {
 
     /// Update the line that is displayed in the widget.
     pub(crate) fn update_text(&mut self, text: String) {
-        // If the text hasn't changed, don't reset the baseline; let the
-        // animation continue advancing naturally.
-        if text == self.text {
-            return;
-        }
-        // Update the target text, preserving newlines so wrapping matches history cells.
-        // Strip ANSI escapes for the character count so the typewriter animation speed is stable.
-        let stripped = {
-            let line = ansi_escape_line(&text);
-            line.spans
-                .iter()
-                .map(|s| s.content.as_ref())
-                .collect::<Vec<_>>()
-                .join("")
-        };
-        let new_len = stripped.chars().count();
-
-        // Compute how many characters are currently revealed so we can carry
-        // this forward as the new baseline when target text changes.
-        let current_frame = self.frame_idx.load(std::sync::atomic::Ordering::Relaxed);
-        let shown_now = self.current_shown_len(current_frame);
-
-        self.text = text;
-        self.last_target_len = new_len;
-        self.base_frame = current_frame;
-        self.reveal_len_at_base = shown_now.min(new_len);
-    }
-
-    /// Reset the animation and start revealing `text` from the beginning.
-    #[cfg(test)]
-    pub(crate) fn restart_with_text(&mut self, text: String) {
-        let sanitized = text.replace(['\n', '\r'], " ");
-        let stripped = {
-            let line = ansi_escape_line(&sanitized);
-            line.spans
-                .iter()
-                .map(|s| s.content.as_ref())
-                .collect::<Vec<_>>()
-                .join("")
-        };
-
-        let new_len = stripped.chars().count();
-        let current_frame = self.frame_idx.load(std::sync::atomic::Ordering::Relaxed);
-
-        self.text = sanitized;
-        self.last_target_len = new_len;
-        self.base_frame = current_frame;
-        // Start from zero revealed characters for a fresh typewriter cycle.
-        self.reveal_len_at_base = 0;
-    }
-
-    /// Calculate how many characters should currently be visible given the
-    /// animation baseline and frame counter.
-    fn current_shown_len(&self, current_frame: usize) -> usize {
-        // Increase typewriter speed (~5x): reveal more characters per frame.
-        const TYPING_CHARS_PER_FRAME: usize = 7;
-        let frames = current_frame.saturating_sub(self.base_frame);
-        let advanced = self
-            .reveal_len_at_base
-            .saturating_add(frames.saturating_mul(TYPING_CHARS_PER_FRAME));
-        advanced.min(self.last_target_len)
-    }
-}
-
-impl Drop for StatusIndicatorWidget {
-    fn drop(&mut self) {
-        use std::sync::atomic::Ordering;
-        self.running.store(false, Ordering::Relaxed);
+        self.text = text.replace(['\n', '\r'], " ");
     }
 }
 
 impl WidgetRef for StatusIndicatorWidget {
     fn render_ref(&self, area: Rect, buf: &mut Buffer) {
-        // Ensure minimal height
-        if area.height == 0 || area.width == 0 {
-            return;
-        }
+        // Schedule the next animation frame.
+        self._app_event_tx
+            .send(AppEvent::ScheduleFrameIn(Duration::from_millis(100)));
 
-        // Build animated gradient header for the word "Working".
-        let idx = self.frame_idx.load(std::sync::atomic::Ordering::Relaxed);
-        let header_text = "Working";
-        let header_chars: Vec<char> = header_text.chars().collect();
-        let padding = 4usize; // virtual padding around the word for smoother loop
-        let period = header_chars.len() + padding * 2;
-        let pos = idx % period;
-        let has_true_color = supports_color::on_cached(supports_color::Stream::Stdout)
-            .map(|level| level.has_16m)
-            .unwrap_or(false);
-        let band_half_width = 2.0; // width of the bright band in characters
+        let widget_style = Style::default();
+        let block = Block::default()
+            .padding(Padding::new(1, 0, 0, 0))
+            .borders(Borders::LEFT)
+            .border_type(BorderType::QuadrantOutside)
+            .border_style(widget_style.dim());
+        let mut header_spans: Vec<Span<'static>> = shimmer_spans("Working");
 
-        let mut header_spans: Vec<Span<'static>> = Vec::new();
-        for (i, ch) in header_chars.iter().enumerate() {
-            let i_pos = i as isize + padding as isize;
-            let pos = pos as isize;
-            let dist = (i_pos - pos).abs() as f32;
-
-            let t = if dist <= band_half_width {
-                let x = std::f32::consts::PI * (dist / band_half_width);
-                0.5 * (1.0 + x.cos())
-            } else {
-                0.0
-            };
-
-            let brightness = 0.4 + 0.6 * t;
-            let level = (brightness * 255.0).clamp(0.0, 255.0) as u8;
-            let style = if has_true_color {
-                Style::default()
-                    .fg(Color::Rgb(level, level, level))
-                    .add_modifier(Modifier::BOLD)
-            } else {
-                // Bold makes dark gray and gray look the same, so don't use it when true color is not supported.
-                Style::default().fg(color_for_level(level))
-            };
-
-            header_spans.push(Span::styled(ch.to_string(), style));
-        }
-
-        // Plain rendering: no borders or padding so the live cell is visually indistinguishable from terminal scrollback.
-        let inner_width = area.width as usize;
-
-        // Compose a single status line like: "▌ Working [•] waiting for model"
-        let mut spans: Vec<Span<'static>> = Vec::new();
-        spans.push(Span::styled("▌ ", Style::default().fg(Color::Cyan)));
-        // Gradient header
-        spans.extend(header_spans);
-        // Space after header
-        spans.push(Span::styled(
+        header_spans.push(Span::styled(
             " ",
             Style::default()
                 .fg(Color::White)
                 .add_modifier(Modifier::BOLD),
         ));
 
-        // Truncate spans to fit the width.
-        let mut acc: Vec<Span<'static>> = Vec::new();
-        let mut used = 0usize;
-        for s in spans {
-            let w = s.content.width();
-            if used + w <= inner_width {
-                acc.push(s);
-                used += w;
+        // Ensure we do not overflow width.
+        let inner_width = block.inner(area).width as usize;
+
+        // Sanitize and colour‑strip the potentially colourful log text.  This
+        // ensures that **no** raw ANSI escape sequences leak into the
+        // back‑buffer which would otherwise cause cursor jumps or stray
+        // artefacts when the terminal is resized.
+        let line = ansi_escape_line(&self.text);
+        let mut sanitized_tail: String = line
+            .spans
+            .iter()
+            .map(|s| s.content.as_ref())
+            .collect::<Vec<_>>()
+            .join("");
+
+        // Truncate *after* stripping escape codes so width calculation is
+        // accurate. See UTF‑8 boundary comments above.
+        let header_len: usize = header_spans.iter().map(|s| s.content.len()).sum();
+
+        if header_len + sanitized_tail.len() > inner_width {
+            let available_bytes = inner_width.saturating_sub(header_len);
+
+            if sanitized_tail.is_char_boundary(available_bytes) {
+                sanitized_tail.truncate(available_bytes);
             } else {
-                break;
+                let mut idx = available_bytes;
+                while idx < sanitized_tail.len() && !sanitized_tail.is_char_boundary(idx) {
+                    idx += 1;
+                }
+                sanitized_tail.truncate(idx);
             }
         }
-        let lines = vec![Line::from(acc)];
 
-        // No-op once full text is revealed; the app no longer reacts to a completion event.
+        let mut spans = header_spans;
 
-        let paragraph = Paragraph::new(lines);
+        // Re‑apply the DIM modifier so the tail appears visually subdued
+        // irrespective of the colour information preserved by
+        // `ansi_escape_line`.
+        spans.push(Span::styled(sanitized_tail, Style::default().dim()));
+
+        let paragraph = Paragraph::new(Line::from(spans))
+            .block(block)
+            .alignment(Alignment::Left);
         paragraph.render_ref(area, buf);
     }
 }
-
-fn color_for_level(level: u8) -> Color {
-    if level < 128 {
-        Color::DarkGray
-    } else if level < 192 {
-        Color::Gray
-    } else {
-        Color::White
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::app_event::AppEvent;
-    use crate::app_event_sender::AppEventSender;
-    use std::sync::mpsc::channel;
-
-    #[test]
-    fn renders_without_left_border_or_padding() {
-        let (tx_raw, _rx) = channel::<AppEvent>();
-        let tx = AppEventSender::new(tx_raw);
-        let mut w = StatusIndicatorWidget::new(tx);
-        w.restart_with_text("Hello".to_string());
-
-        let area = ratatui::layout::Rect::new(0, 0, 30, 1);
-        // Allow a short delay so the typewriter reveals the first character.
-        std::thread::sleep(std::time::Duration::from_millis(120));
-        let mut buf = ratatui::buffer::Buffer::empty(area);
-        w.render_ref(area, &mut buf);
-
-        // Leftmost column has the left bar
-        let ch0 = buf[(0, 0)].symbol().chars().next().unwrap_or(' ');
-        assert_eq!(ch0, '▌', "expected left bar at col 0: {ch0:?}");
-    }
-
-    #[test]
-    fn working_header_is_present_on_last_line() {
-        let (tx_raw, _rx) = channel::<AppEvent>();
-        let tx = AppEventSender::new(tx_raw);
-        let mut w = StatusIndicatorWidget::new(tx);
-        w.restart_with_text("Hi".to_string());
-        // Ensure some frames elapse so we get a stable state.
-        std::thread::sleep(std::time::Duration::from_millis(120));
-
-        let area = ratatui::layout::Rect::new(0, 0, 30, 1);
-        let mut buf = ratatui::buffer::Buffer::empty(area);
-        w.render_ref(area, &mut buf);
-
-        // Single line; it should contain the animated "Working" header.
-        let mut row = String::new();
-        for x in 0..area.width {
-            row.push(buf[(x, 0)].symbol().chars().next().unwrap_or(' '));
-        }
-        assert!(row.contains("Working"), "expected Working header: {row:?}");
-    }
-}

codex-rs/tui/src/text_block.rs

@@ -1,4 +1,9 @@
 use ratatui::prelude::*;
+use ratatui::widgets::Paragraph;
+use ratatui::widgets::WidgetRef;
+use ratatui::widgets::Wrap;
+
+use crate::history_cell::DynamicHeightWidgetRef;
 
 /// A simple widget that just displays a list of `Line`s via a `Paragraph`.
 /// This is the default rendering backend for most `HistoryCell` variants.
@@ -12,3 +17,21 @@ impl TextBlock {
         Self { lines }
     }
 }
+
+impl DynamicHeightWidgetRef for &TextBlock {
+    fn desired_height(&self, width: u16) -> u16 {
+        Paragraph::new(Text::from(self.lines.clone()))
+            .wrap(Wrap { trim: false })
+            .line_count(width)
+            .try_into()
+            .unwrap_or(0)
+    }
+}
+
+impl WidgetRef for &TextBlock {
+    fn render_ref(&self, area: Rect, buf: &mut Buffer) {
+        Paragraph::new(Text::from(self.lines.clone()))
+            .wrap(Wrap { trim: false })
+            .render(area, buf);
+    }
+}

codex-rs/tui/tests/vt100_history.rs

@@ -1,214 +0,0 @@
-#![cfg(feature = "vt100-tests")]
-#![expect(clippy::expect_used)]
-
-use ratatui::backend::TestBackend;
-use ratatui::layout::Rect;
-use ratatui::style::Color;
-use ratatui::style::Style;
-use ratatui::text::Line;
-use ratatui::text::Span;
-
-// Small helper macro to assert a collection contains an item with a clearer
-// failure message.
-macro_rules! assert_contains {
-    ($collection:expr, $item:expr $(,)?) => {
-        assert!(
-            $collection.contains(&$item),
-            "Expected {:?} to contain {:?}",
-            $collection,
-            $item
-        );
-    };
-    ($collection:expr, $item:expr, $($arg:tt)+) => {
-        assert!($collection.contains(&$item), $($arg)+);
-    };
-}
-
-struct TestScenario {
-    width: u16,
-    height: u16,
-    term: codex_tui::custom_terminal::Terminal<TestBackend>,
-}
-
-impl TestScenario {
-    fn new(width: u16, height: u16, viewport: Rect) -> Self {
-        let backend = TestBackend::new(width, height);
-        let mut term = codex_tui::custom_terminal::Terminal::with_options(backend)
-            .expect("failed to construct terminal");
-        term.set_viewport_area(viewport);
-        Self {
-            width,
-            height,
-            term,
-        }
-    }
-
-    fn run_insert(&mut self, lines: Vec<Line<'static>>) -> Vec<u8> {
-        let mut buf: Vec<u8> = Vec::new();
-        codex_tui::insert_history::insert_history_lines_to_writer(&mut self.term, &mut buf, lines);
-        buf
-    }
-
-    fn screen_rows_from_bytes(&self, bytes: &[u8]) -> Vec<String> {
-        let mut parser = vt100::Parser::new(self.height, self.width, 0);
-        parser.process(bytes);
-        let screen = parser.screen();
-
-        let mut rows: Vec<String> = Vec::with_capacity(self.height as usize);
-        for row in 0..self.height {
-            let mut s = String::with_capacity(self.width as usize);
-            for col in 0..self.width {
-                if let Some(cell) = screen.cell(row, col) {
-                    if let Some(ch) = cell.contents().chars().next() {
-                        s.push(ch);
-                    } else {
-                        s.push(' ');
-                    }
-                } else {
-                    s.push(' ');
-                }
-            }
-            rows.push(s.trim_end().to_string());
-        }
-        rows
-    }
-}
-
-#[test]
-fn hist_001_basic_insertion_no_wrap() {
-    // Screen of 20x6; viewport is the last row (height=1 at y=5)
-    let area = Rect::new(0, 5, 20, 1);
-    let mut scenario = TestScenario::new(20, 6, area);
-
-    let lines = vec![Line::from("first"), Line::from("second")];
-    let buf = scenario.run_insert(lines);
-    let rows = scenario.screen_rows_from_bytes(&buf);
-    assert_contains!(rows, String::from("first"));
-    assert_contains!(rows, String::from("second"));
-    let first_idx = rows
-        .iter()
-        .position(|r| r == "first")
-        .expect("expected 'first' row to be present");
-    let second_idx = rows
-        .iter()
-        .position(|r| r == "second")
-        .expect("expected 'second' row to be present");
-    assert_eq!(second_idx, first_idx + 1, "rows should be adjacent");
-}
-
-#[test]
-fn hist_002_long_token_wraps() {
-    let area = Rect::new(0, 5, 20, 1);
-    let mut scenario = TestScenario::new(20, 6, area);
-
-    let long = "A".repeat(45); // > 2 lines at width 20
-    let lines = vec![Line::from(long.clone())];
-    let buf = scenario.run_insert(lines);
-    let mut parser = vt100::Parser::new(6, 20, 0);
-    parser.process(&buf);
-    let screen = parser.screen();
-
-    // Count total A's on the screen
-    let mut count_a = 0usize;
-    for row in 0..6 {
-        for col in 0..20 {
-            if let Some(cell) = screen.cell(row, col) {
-                if let Some(ch) = cell.contents().chars().next() {
-                    if ch == 'A' {
-                        count_a += 1;
-                    }
-                }
-            }
-        }
-    }
-
-    assert_eq!(
-        count_a,
-        long.len(),
-        "wrapped content did not preserve all characters"
-    );
-}
-
-#[test]
-fn hist_003_emoji_and_cjk() {
-    let area = Rect::new(0, 5, 20, 1);
-    let mut scenario = TestScenario::new(20, 6, area);
-
-    let text = String::from("😀😀😀😀😀 你好世界");
-    let lines = vec![Line::from(text.clone())];
-    let buf = scenario.run_insert(lines);
-    let rows = scenario.screen_rows_from_bytes(&buf);
-    let reconstructed: String = rows.join("").chars().filter(|c| *c != ' ').collect();
-    for ch in text.chars().filter(|c| !c.is_whitespace()) {
-        assert!(
-            reconstructed.contains(ch),
-            "missing character {ch:?} in reconstructed screen"
-        );
-    }
-}
-
-#[test]
-fn hist_004_mixed_ansi_spans() {
-    let area = Rect::new(0, 5, 20, 1);
-    let mut scenario = TestScenario::new(20, 6, area);
-
-    let line = Line::from(vec![
-        Span::styled("red", Style::default().fg(Color::Red)),
-        Span::raw("+plain"),
-    ]);
-    let buf = scenario.run_insert(vec![line]);
-    let rows = scenario.screen_rows_from_bytes(&buf);
-    assert_contains!(rows, String::from("red+plain"));
-}
-
-#[test]
-fn hist_006_cursor_restoration() {
-    let area = Rect::new(0, 5, 20, 1);
-    let mut scenario = TestScenario::new(20, 6, area);
-
-    let lines = vec![Line::from("x")];
-    let buf = scenario.run_insert(lines);
-    let s = String::from_utf8_lossy(&buf);
-    // CUP to 1;1 (ANSI: ESC[1;1H)
-    assert!(
-        s.contains("\u{1b}[1;1H"),
-        "expected final CUP to 1;1 in output, got: {s:?}"
-    );
-    // Reset scroll region
-    assert!(
-        s.contains("\u{1b}[r"),
-        "expected reset scroll region in output, got: {s:?}"
-    );
-}
-
-#[test]
-fn hist_005_pre_scroll_region_down() {
-    // Viewport not at bottom: y=3 (0-based), height=1
-    let area = Rect::new(0, 3, 20, 1);
-    let mut scenario = TestScenario::new(20, 6, area);
-
-    let lines = vec![Line::from("first"), Line::from("second")];
-    let buf = scenario.run_insert(lines);
-    let s = String::from_utf8_lossy(&buf);
-    // Expect we limited scroll region to [top+1 .. screen_height] => [4 .. 6] (1-based)
-    assert!(
-        s.contains("\u{1b}[4;6r"),
-        "expected pre-scroll SetScrollRegion 4..6, got: {s:?}"
-    );
-    // Expect we moved cursor to top of that region: row 3 (0-based) => CUP 4;1H
-    assert!(
-        s.contains("\u{1b}[4;1H"),
-        "expected cursor at top of pre-scroll region, got: {s:?}"
-    );
-    // Expect at least two Reverse Index commands (ESC M) for two inserted lines
-    let ri_count = s.matches("\u{1b}M").count();
-    assert!(
-        ri_count >= 1,
-        "expected at least one RI (ESC M), got: {s:?}"
-    );
-    // After pre-scroll, we set insertion scroll region to [1 .. new_top] => [1 .. 5]
-    assert!(
-        s.contains("\u{1b}[1;5r"),
-        "expected insertion SetScrollRegion 1..5, got: {s:?}"
-    );
-}

codex-rs/tui/tests/vt100_live_commit.rs

@@ -1,101 +0,0 @@
-#![cfg(feature = "vt100-tests")]
-
-use ratatui::backend::TestBackend;
-use ratatui::layout::Rect;
-use ratatui::text::Line;
-
-#[test]
-fn live_001_commit_on_overflow() {
-    let backend = TestBackend::new(20, 6);
-    let mut term = match codex_tui::custom_terminal::Terminal::with_options(backend) {
-        Ok(t) => t,
-        Err(e) => panic!("failed to construct terminal: {e}"),
-    };
-    let area = Rect::new(0, 5, 20, 1);
-    term.set_viewport_area(area);
-
-    // Build 5 explicit rows at width 20.
-    let mut rb = codex_tui::live_wrap::RowBuilder::new(20);
-    rb.push_fragment("one\n");
-    rb.push_fragment("two\n");
-    rb.push_fragment("three\n");
-    rb.push_fragment("four\n");
-    rb.push_fragment("five\n");
-
-    // Keep the last 3 in the live ring; commit the first 2.
-    let commit_rows = rb.drain_commit_ready(3);
-    let lines: Vec<Line<'static>> = commit_rows
-        .into_iter()
-        .map(|r| Line::from(r.text))
-        .collect();
-
-    let mut buf: Vec<u8> = Vec::new();
-    codex_tui::insert_history::insert_history_lines_to_writer(&mut term, &mut buf, lines);
-
-    let mut parser = vt100::Parser::new(6, 20, 0);
-    parser.process(&buf);
-    let screen = parser.screen();
-
-    // The words "one" and "two" should appear above the viewport.
-    let mut joined = String::new();
-    for row in 0..6 {
-        for col in 0..20 {
-            if let Some(cell) = screen.cell(row, col) {
-                if let Some(ch) = cell.contents().chars().next() {
-                    joined.push(ch);
-                } else {
-                    joined.push(' ');
-                }
-            }
-        }
-        joined.push('\n');
-    }
-    assert!(
-        joined.contains("one"),
-        "expected committed 'one' to be visible\n{joined}"
-    );
-    assert!(
-        joined.contains("two"),
-        "expected committed 'two' to be visible\n{joined}"
-    );
-    // The last three (three,four,five) remain in the live ring, not committed here.
-}
-
-#[test]
-fn live_002_pre_scroll_and_commit() {
-    let backend = TestBackend::new(20, 6);
-    let mut term = match codex_tui::custom_terminal::Terminal::with_options(backend) {
-        Ok(t) => t,
-        Err(e) => panic!("failed to construct terminal: {e}"),
-    };
-    // Viewport not at bottom: y=3
-    let area = Rect::new(0, 3, 20, 1);
-    term.set_viewport_area(area);
-
-    let mut rb = codex_tui::live_wrap::RowBuilder::new(20);
-    rb.push_fragment("alpha\n");
-    rb.push_fragment("beta\n");
-    rb.push_fragment("gamma\n");
-    rb.push_fragment("delta\n");
-
-    // Keep 3, commit 1.
-    let commit_rows = rb.drain_commit_ready(3);
-    let lines: Vec<Line<'static>> = commit_rows
-        .into_iter()
-        .map(|r| Line::from(r.text))
-        .collect();
-
-    let mut buf: Vec<u8> = Vec::new();
-    codex_tui::insert_history::insert_history_lines_to_writer(&mut term, &mut buf, lines);
-    let s = String::from_utf8_lossy(&buf);
-
-    // Expect a SetScrollRegion to [area.top()+1 .. screen_height] and a cursor move to top of that region.
-    assert!(
-        s.contains("\u{1b}[4;6r"),
-        "expected pre-scroll region 4..6, got: {s:?}"
-    );
-    assert!(
-        s.contains("\u{1b}[4;1H"),
-        "expected cursor CUP 4;1H, got: {s:?}"
-    );
-}