feat: add phase 1 mem client

codex-rs/codex-api/README.md

@@ -29,4 +29,13 @@ The public interface of this crate is intentionally small and uniform:
   - Output: `Vec<ResponseItem>`.
   - `CompactClient::compact_input(&CompactionInput, extra_headers)` wraps the JSON encoding and retry/telemetry wiring.
 
+- **Memory trace summarize endpoint**
+  - Input: `MemoryTraceSummarizeInput` (re-exported as `codex_api::MemoryTraceSummarizeInput`):
+    - `model: String`.
+    - `traces: Vec<MemoryTrace>`.
+      - `MemoryTrace` includes `id`, `metadata.source_path`, and normalized `items`.
+    - `reasoning: Option<Reasoning>`.
+  - Output: `Vec<MemoryTraceSummaryOutput>`.
+  - `MemoriesClient::trace_summarize_input(&MemoryTraceSummarizeInput, extra_headers)` wraps JSON encoding and retry/telemetry wiring.
+
 All HTTP details (URLs, headers, retry/backoff policies, SSE framing) are encapsulated in `codex-api` and `codex-client`. Callers construct prompts/inputs using protocol types and work with typed streams of `ResponseEvent` or compacted `ResponseItem` values.

codex-rs/codex-api/src/common.rs

@@ -6,6 +6,7 @@ use codex_protocol::openai_models::ReasoningEffort as ReasoningEffortConfig;
 use codex_protocol::protocol::RateLimitSnapshot;
 use codex_protocol::protocol::TokenUsage;
 use futures::Stream;
+use serde::Deserialize;
 use serde::Serialize;
 use serde_json::Value;
 use std::pin::Pin;
@@ -37,6 +38,33 @@ pub struct CompactionInput<'a> {
     pub instructions: &'a str,
 }
 
+/// Canonical input payload for the memory trace summarize endpoint.
+#[derive(Debug, Clone, Serialize)]
+pub struct MemoryTraceSummarizeInput {
+    pub model: String,
+    pub traces: Vec<MemoryTrace>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub reasoning: Option<Reasoning>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct MemoryTrace {
+    pub id: String,
+    pub metadata: MemoryTraceMetadata,
+    pub items: Vec<Value>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct MemoryTraceMetadata {
+    pub source_path: String,
+}
+
+#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
+pub struct MemoryTraceSummaryOutput {
+    pub trace_summary: String,
+    pub memory_summary: String,
+}
+
 #[derive(Debug)]
 pub enum ResponseEvent {
     Created,

codex-rs/codex-api/src/endpoint/memories.rs

@@ -0,0 +1,108 @@
+use crate::auth::AuthProvider;
+use crate::common::MemoryTraceSummarizeInput;
+use crate::common::MemoryTraceSummaryOutput;
+use crate::endpoint::session::EndpointSession;
+use crate::error::ApiError;
+use crate::provider::Provider;
+use codex_client::HttpTransport;
+use codex_client::RequestTelemetry;
+use http::HeaderMap;
+use http::Method;
+use serde::Deserialize;
+use serde_json::to_value;
+use std::sync::Arc;
+
+pub struct MemoriesClient<T: HttpTransport, A: AuthProvider> {
+    session: EndpointSession<T, A>,
+}
+
+impl<T: HttpTransport, A: AuthProvider> MemoriesClient<T, A> {
+    pub fn new(transport: T, provider: Provider, auth: A) -> Self {
+        Self {
+            session: EndpointSession::new(transport, provider, auth),
+        }
+    }
+
+    pub fn with_telemetry(self, request: Option<Arc<dyn RequestTelemetry>>) -> Self {
+        Self {
+            session: self.session.with_request_telemetry(request),
+        }
+    }
+
+    fn path() -> &'static str {
+        "memories/trace_summarize"
+    }
+
+    pub async fn trace_summarize(
+        &self,
+        body: serde_json::Value,
+        extra_headers: HeaderMap,
+    ) -> Result<Vec<MemoryTraceSummaryOutput>, ApiError> {
+        let resp = self
+            .session
+            .execute(Method::POST, Self::path(), extra_headers, Some(body))
+            .await?;
+        let parsed: TraceSummarizeResponse =
+            serde_json::from_slice(&resp.body).map_err(|e| ApiError::Stream(e.to_string()))?;
+        Ok(parsed.output)
+    }
+
+    pub async fn trace_summarize_input(
+        &self,
+        input: &MemoryTraceSummarizeInput,
+        extra_headers: HeaderMap,
+    ) -> Result<Vec<MemoryTraceSummaryOutput>, ApiError> {
+        let body = to_value(input).map_err(|e| {
+            ApiError::Stream(format!(
+                "failed to encode memory trace summarize input: {e}"
+            ))
+        })?;
+        self.trace_summarize(body, extra_headers).await
+    }
+}
+
+#[derive(Debug, Deserialize)]
+struct TraceSummarizeResponse {
+    output: Vec<MemoryTraceSummaryOutput>,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use async_trait::async_trait;
+    use codex_client::Request;
+    use codex_client::Response;
+    use codex_client::StreamResponse;
+    use codex_client::TransportError;
+
+    #[derive(Clone, Default)]
+    struct DummyTransport;
+
+    #[async_trait]
+    impl HttpTransport for DummyTransport {
+        async fn execute(&self, _req: Request) -> Result<Response, TransportError> {
+            Err(TransportError::Build("execute should not run".to_string()))
+        }
+
+        async fn stream(&self, _req: Request) -> Result<StreamResponse, TransportError> {
+            Err(TransportError::Build("stream should not run".to_string()))
+        }
+    }
+
+    #[derive(Clone, Default)]
+    struct DummyAuth;
+
+    impl AuthProvider for DummyAuth {
+        fn bearer_token(&self) -> Option<String> {
+            None
+        }
+    }
+
+    #[test]
+    fn path_is_memories_trace_summarize() {
+        assert_eq!(
+            MemoriesClient::<DummyTransport, DummyAuth>::path(),
+            "memories/trace_summarize"
+        );
+    }
+}

codex-rs/codex-api/src/endpoint/mod.rs

@@ -1,5 +1,6 @@
 pub mod aggregate;
 pub mod compact;
+pub mod memories;
 pub mod models;
 pub mod responses;
 pub mod responses_websocket;

codex-rs/codex-api/src/lib.rs

@@ -15,6 +15,10 @@ pub use codex_client::TransportError;
 
 pub use crate::auth::AuthProvider;
 pub use crate::common::CompactionInput;
+pub use crate::common::MemoryTrace;
+pub use crate::common::MemoryTraceMetadata;
+pub use crate::common::MemoryTraceSummarizeInput;
+pub use crate::common::MemoryTraceSummaryOutput;
 pub use crate::common::Prompt;
 pub use crate::common::ResponseAppendWsRequest;
 pub use crate::common::ResponseCreateWsRequest;
@@ -24,6 +28,7 @@ pub use crate::common::ResponsesApiRequest;
 pub use crate::common::create_text_param_for_request;
 pub use crate::endpoint::aggregate::AggregateStreamExt;
 pub use crate::endpoint::compact::CompactClient;
+pub use crate::endpoint::memories::MemoriesClient;
 pub use crate::endpoint::models::ModelsClient;
 pub use crate::endpoint::responses::ResponsesClient;
 pub use crate::endpoint::responses::ResponsesOptions;

codex-rs/core/src/client.rs

@@ -7,6 +7,10 @@ use crate::api_bridge::map_api_error;
 use crate::auth::UnauthorizedRecovery;
 use codex_api::CompactClient as ApiCompactClient;
 use codex_api::CompactionInput as ApiCompactionInput;
+use codex_api::MemoriesClient as ApiMemoriesClient;
+use codex_api::MemoryTrace as ApiMemoryTrace;
+use codex_api::MemoryTraceSummarizeInput as ApiMemoryTraceSummarizeInput;
+use codex_api::MemoryTraceSummaryOutput as ApiMemoryTraceSummaryOutput;
 use codex_api::Prompt as ApiPrompt;
 use codex_api::RequestTelemetry;
 use codex_api::ReqwestTransport;
@@ -238,6 +242,55 @@ impl ModelClient {
             instructions: &instructions,
         };
 
+        let extra_headers = self.build_subagent_headers();
+        client
+            .compact_input(&payload, extra_headers)
+            .await
+            .map_err(map_api_error)
+    }
+
+    /// Builds memory summaries for each provided normalized trace.
+    ///
+    /// This is a unary call (no streaming) to `/v1/memories/trace_summarize`.
+    pub async fn summarize_memory_traces(
+        &self,
+        traces: Vec<ApiMemoryTrace>,
+    ) -> Result<Vec<ApiMemoryTraceSummaryOutput>> {
+        if traces.is_empty() {
+            return Ok(Vec::new());
+        }
+
+        let auth_manager = self.state.auth_manager.clone();
+        let auth = match auth_manager.as_ref() {
+            Some(manager) => manager.auth().await,
+            None => None,
+        };
+        let api_provider = self
+            .state
+            .provider
+            .to_api_provider(auth.as_ref().map(CodexAuth::internal_auth_mode))?;
+        let api_auth = auth_provider_from_auth(auth, &self.state.provider)?;
+        let transport = ReqwestTransport::new(build_reqwest_client());
+        let request_telemetry = self.build_request_telemetry();
+        let client = ApiMemoriesClient::new(transport, api_provider, api_auth)
+            .with_telemetry(Some(request_telemetry));
+
+        let payload = ApiMemoryTraceSummarizeInput {
+            model: self.state.model_info.slug.clone(),
+            traces,
+            reasoning: self.state.effort.map(|effort| Reasoning {
+                effort: Some(effort),
+                summary: None,
+            }),
+        };
+
+        client
+            .trace_summarize_input(&payload, self.build_subagent_headers())
+            .await
+            .map_err(map_api_error)
+    }
+
+    fn build_subagent_headers(&self) -> ApiHeaderMap {
         let mut extra_headers = ApiHeaderMap::new();
         if let SessionSource::SubAgent(sub) = &self.state.session_source {
             let subagent = match sub {
@@ -250,10 +303,7 @@ impl ModelClient {
                 extra_headers.insert("x-openai-subagent", val);
             }
         }
-        client
-            .compact_input(&payload, extra_headers)
-            .await
-            .map_err(map_api_error)
+        extra_headers
     }
 }
 

codex-rs/core/src/lib.rs

@@ -161,4 +161,5 @@ pub use codex_protocol::models::ResponseItem;
 pub use compact::content_items_to_text;
 pub use event_mapping::parse_turn_item;
 pub mod compact;
+pub mod memory_trace;
 pub mod otel_init;

codex-rs/core/src/memory_trace.rs

@@ -0,0 +1,292 @@
+use std::path::Path;
+use std::path::PathBuf;
+
+use crate::ModelClient;
+use crate::error::CodexErr;
+use crate::error::Result;
+use codex_api::MemoryTrace as ApiMemoryTrace;
+use codex_api::MemoryTraceMetadata as ApiMemoryTraceMetadata;
+use serde_json::Map;
+use serde_json::Value;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct BuiltTraceMemory {
+    pub trace_id: String,
+    pub source_path: PathBuf,
+    pub trace_summary: String,
+    pub memory_summary: String,
+}
+
+struct PreparedTrace {
+    trace_id: String,
+    source_path: PathBuf,
+    payload: ApiMemoryTrace,
+}
+
+/// Loads raw trace files, normalizes trace items, and builds memory summaries.
+///
+/// The request/response wiring mirrors the memory trace summarize E2E flow:
+/// `/v1/memories/trace_summarize` with one output object per input trace.
+pub async fn build_memories_from_trace_files(
+    client: &ModelClient,
+    trace_paths: &[PathBuf],
+) -> Result<Vec<BuiltTraceMemory>> {
+    if trace_paths.is_empty() {
+        return Ok(Vec::new());
+    }
+
+    let mut prepared = Vec::with_capacity(trace_paths.len());
+    for (index, path) in trace_paths.iter().enumerate() {
+        prepared.push(prepare_trace(index + 1, path).await?);
+    }
+
+    let traces = prepared.iter().map(|trace| trace.payload.clone()).collect();
+    let output = client.summarize_memory_traces(traces).await?;
+    if output.len() != prepared.len() {
+        return Err(CodexErr::InvalidRequest(format!(
+            "unexpected memory summarize output length: expected {}, got {}",
+            prepared.len(),
+            output.len()
+        )));
+    }
+
+    Ok(prepared
+        .into_iter()
+        .zip(output)
+        .map(|(trace, summary)| BuiltTraceMemory {
+            trace_id: trace.trace_id,
+            source_path: trace.source_path,
+            trace_summary: summary.trace_summary,
+            memory_summary: summary.memory_summary,
+        })
+        .collect())
+}
+
+async fn prepare_trace(index: usize, path: &Path) -> Result<PreparedTrace> {
+    let text = load_trace_text(path).await?;
+    let items = load_trace_items(path, &text)?;
+    let trace_id = build_trace_id(index, path);
+    let source_path = path.to_path_buf();
+
+    Ok(PreparedTrace {
+        trace_id: trace_id.clone(),
+        source_path: source_path.clone(),
+        payload: ApiMemoryTrace {
+            id: trace_id,
+            metadata: ApiMemoryTraceMetadata {
+                source_path: source_path.display().to_string(),
+            },
+            items,
+        },
+    })
+}
+
+async fn load_trace_text(path: &Path) -> Result<String> {
+    let raw = tokio::fs::read(path).await?;
+    Ok(decode_trace_bytes(&raw))
+}
+
+fn decode_trace_bytes(raw: &[u8]) -> String {
+    if let Some(without_bom) = raw.strip_prefix(&[0xEF, 0xBB, 0xBF])
+        && let Ok(text) = String::from_utf8(without_bom.to_vec())
+    {
+        return text;
+    }
+    if let Ok(text) = String::from_utf8(raw.to_vec()) {
+        return text;
+    }
+    raw.iter().map(|b| char::from(*b)).collect()
+}
+
+fn load_trace_items(path: &Path, text: &str) -> Result<Vec<Value>> {
+    if let Ok(Value::Array(items)) = serde_json::from_str::<Value>(text) {
+        let dict_items = items
+            .into_iter()
+            .filter(serde_json::Value::is_object)
+            .collect::<Vec<_>>();
+        if dict_items.is_empty() {
+            return Err(CodexErr::InvalidRequest(format!(
+                "no object items found in trace file: {}",
+                path.display()
+            )));
+        }
+        return normalize_trace_items(dict_items, path);
+    }
+
+    let mut parsed_items = Vec::new();
+    for line in text.lines() {
+        let line = line.trim();
+        if line.is_empty() || (!line.starts_with('{') && !line.starts_with('[')) {
+            continue;
+        }
+
+        let Ok(obj) = serde_json::from_str::<Value>(line) else {
+            continue;
+        };
+
+        match obj {
+            Value::Object(_) => parsed_items.push(obj),
+            Value::Array(inner) => {
+                parsed_items.extend(inner.into_iter().filter(serde_json::Value::is_object))
+            }
+            _ => {}
+        }
+    }
+
+    if parsed_items.is_empty() {
+        return Err(CodexErr::InvalidRequest(format!(
+            "no JSON items parsed from trace file: {}",
+            path.display()
+        )));
+    }
+
+    normalize_trace_items(parsed_items, path)
+}
+
+fn normalize_trace_items(items: Vec<Value>, path: &Path) -> Result<Vec<Value>> {
+    let mut normalized = Vec::new();
+
+    for item in items {
+        let Value::Object(obj) = item else {
+            continue;
+        };
+
+        if let Some(payload) = obj.get("payload") {
+            if obj.get("type").and_then(Value::as_str) != Some("response_item") {
+                continue;
+            }
+
+            match payload {
+                Value::Object(payload_item) => {
+                    if is_allowed_trace_item(payload_item) {
+                        normalized.push(Value::Object(payload_item.clone()));
+                    }
+                }
+                Value::Array(payload_items) => {
+                    for payload_item in payload_items {
+                        if let Value::Object(payload_item) = payload_item
+                            && is_allowed_trace_item(payload_item)
+                        {
+                            normalized.push(Value::Object(payload_item.clone()));
+                        }
+                    }
+                }
+                _ => {}
+            }
+            continue;
+        }
+
+        if is_allowed_trace_item(&obj) {
+            normalized.push(Value::Object(obj));
+        }
+    }
+
+    if normalized.is_empty() {
+        return Err(CodexErr::InvalidRequest(format!(
+            "no valid trace items after normalization: {}",
+            path.display()
+        )));
+    }
+    Ok(normalized)
+}
+
+fn is_allowed_trace_item(item: &Map<String, Value>) -> bool {
+    let Some(item_type) = item.get("type").and_then(Value::as_str) else {
+        return false;
+    };
+
+    if item_type == "message" {
+        return matches!(
+            item.get("role").and_then(Value::as_str),
+            Some("assistant" | "system" | "developer" | "user")
+        );
+    }
+
+    true
+}
+
+fn build_trace_id(index: usize, path: &Path) -> String {
+    let stem = path
+        .file_stem()
+        .map(|stem| stem.to_string_lossy().into_owned())
+        .filter(|stem| !stem.is_empty())
+        .unwrap_or_else(|| "trace".to_string());
+    format!("trace_{index}_{stem}")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use pretty_assertions::assert_eq;
+    use tempfile::tempdir;
+
+    #[test]
+    fn normalize_trace_items_handles_payload_wrapper_and_message_role_filtering() {
+        let items = vec![
+            serde_json::json!({
+                "type": "response_item",
+                "payload": {"type": "message", "role": "assistant", "content": []}
+            }),
+            serde_json::json!({
+                "type": "response_item",
+                "payload": [
+                    {"type": "message", "role": "user", "content": []},
+                    {"type": "message", "role": "tool", "content": []},
+                    {"type": "function_call", "name": "shell", "arguments": "{}", "call_id": "c1"}
+                ]
+            }),
+            serde_json::json!({
+                "type": "not_response_item",
+                "payload": {"type": "message", "role": "assistant", "content": []}
+            }),
+            serde_json::json!({
+                "type": "message",
+                "role": "developer",
+                "content": []
+            }),
+        ];
+
+        let normalized = normalize_trace_items(items, Path::new("trace.json")).expect("normalize");
+        let expected = vec![
+            serde_json::json!({"type": "message", "role": "assistant", "content": []}),
+            serde_json::json!({"type": "message", "role": "user", "content": []}),
+            serde_json::json!({"type": "function_call", "name": "shell", "arguments": "{}", "call_id": "c1"}),
+            serde_json::json!({"type": "message", "role": "developer", "content": []}),
+        ];
+        assert_eq!(normalized, expected);
+    }
+
+    #[test]
+    fn load_trace_items_supports_jsonl_arrays_and_objects() {
+        let text = r#"
+{"type":"response_item","payload":{"type":"message","role":"assistant","content":[]}}
+[{"type":"message","role":"user","content":[]},{"type":"message","role":"tool","content":[]}]
+"#;
+        let loaded = load_trace_items(Path::new("trace.jsonl"), text).expect("load");
+        let expected = vec![
+            serde_json::json!({"type":"message","role":"assistant","content":[]}),
+            serde_json::json!({"type":"message","role":"user","content":[]}),
+        ];
+        assert_eq!(loaded, expected);
+    }
+
+    #[tokio::test]
+    async fn load_trace_text_decodes_utf8_sig() {
+        let dir = tempdir().expect("tempdir");
+        let path = dir.path().join("trace.json");
+        tokio::fs::write(
+            &path,
+            [
+                0xEF, 0xBB, 0xBF, b'[', b'{', b'"', b't', b'y', b'p', b'e', b'"', b':', b'"', b'm',
+                b'e', b's', b's', b'a', b'g', b'e', b'"', b',', b'"', b'r', b'o', b'l', b'e', b'"',
+                b':', b'"', b'u', b's', b'e', b'r', b'"', b',', b'"', b'c', b'o', b'n', b't', b'e',
+                b'n', b't', b'"', b':', b'[', b']', b'}', b']',
+            ],
+        )
+        .await
+        .expect("write");
+
+        let text = load_trace_text(&path).await.expect("decode");
+        assert!(text.starts_with('['));
+    }
+}