Preserve response IDs for fast collaborator tool events (#42752)

## Why

Collaborator tools can finish before their sampling response arrives, causing
their analytics events to be emitted without response correlation.

## What changed

Hold completed collaborator tool events until the reducer can attach their
originating and subsequent response IDs.

## Testing

Add coverage for both orderings of collaborator completion and sampling
response arrival.

GitOrigin-RevId: 5933424dd90702685cdb4a9693fed96c7885989a

codex-rs/analytics/src/analytics_client_tests.rs

@@ -2937,6 +2937,92 @@ fn sampling_response(
     }
 }
 
+#[tokio::test]
+async fn collaborator_tool_events_keep_response_ids_when_completion_races_sampling() {
+    for response_first in [false, true] {
+        let mut reducer = AnalyticsReducer::default();
+        let mut events = Vec::new();
+        ingest_review_prerequisites(&mut reducer, &mut events).await;
+        reducer
+            .ingest(
+                AnalyticsFact::Notification(Box::new(sample_turn_started_notification(
+                    "thread-1", "turn-1",
+                ))),
+                &mut events,
+            )
+            .await;
+        let item = ThreadItem::CollabAgentToolCall {
+            id: "call-1".into(),
+            tool: CollabAgentTool::SendMessage,
+            status: CollabAgentToolCallStatus::Failed,
+            sender_thread_id: "thread-1".into(),
+            receiver_thread_ids: Vec::new(),
+            prompt: None,
+            model: None,
+            reasoning_effort: None,
+            agents_states: Default::default(),
+        };
+        reducer
+            .ingest(
+                AnalyticsFact::Notification(Box::new(ServerNotification::ItemStarted(
+                    ItemStartedNotification {
+                        thread_id: "thread-1".into(),
+                        turn_id: "turn-1".into(),
+                        started_at_ms: 1_000,
+                        item: item.clone(),
+                    },
+                ))),
+                &mut events,
+            )
+            .await;
+        let response = AnalyticsFact::Custom(CustomAnalyticsFact::CodeModeToolCall(
+            sampling_response("turn-1", "response-1", &["call-1"]),
+        ));
+        let completion = AnalyticsFact::Notification(Box::new(ServerNotification::ItemCompleted(
+            ItemCompletedNotification {
+                thread_id: "thread-1".into(),
+                turn_id: "turn-1".into(),
+                completed_at_ms: 1_010,
+                item,
+            },
+        )));
+        let facts = if response_first {
+            [response, completion]
+        } else {
+            [completion, response]
+        };
+        for fact in facts {
+            reducer.ingest(fact, &mut events).await;
+            assert!(events.is_empty(), "emitted before response correlation");
+        }
+        ingest_code_mode_facts(
+            &mut reducer,
+            &mut events,
+            [sampling_response("turn-1", "response-2", &[])],
+        )
+        .await;
+        let payload = serde_json::to_value(&events).expect("serialize collaborator event");
+        assert_eq!(payload.as_array().expect("events array").len(), 1);
+        let params = &payload[0]["event_params"];
+        assert_eq!(
+            json!({
+                "type": payload[0]["event_type"],
+                "item": params["item_id"],
+                "origin": params["originating_response_id"],
+                "subsequent": params["subsequent_response_id"],
+                "status": params["terminal_status"],
+            }),
+            json!({
+                "type": "codex_collab_agent_tool_call_event",
+                "item": "call-1",
+                "origin": "response-1",
+                "subsequent": "response-2",
+                "status": "failed",
+            }),
+        );
+    }
+}
+
 #[tokio::test]
 async fn code_mode_exec_wait_and_child_events_share_cell_and_response_ids() {
     let mut reducer = AnalyticsReducer::default();
@@ -5413,9 +5499,9 @@ async fn turn_event_counts_completed_tool_items() {
             "codex_file_change_event",
             "codex_mcp_tool_call_event",
             "codex_dynamic_tool_call_event",
-            "codex_collab_agent_tool_call_event",
             "codex_web_search_event",
             "codex_image_generation_event",
+            "codex_collab_agent_tool_call_event",
             "codex_control_tool_call_event",
         ]
         .map(|event_type| (event_type, "session-thread-2", "turn-2", "root-ancestor"))

codex-rs/analytics/src/reducer.rs

@@ -1966,12 +1966,20 @@ impl AnalyticsReducer {
                         .get(&notification.turn_id)
                         .and_then(|turn| turn.resolved_config.as_ref())
                         .and_then(|config| config.turn_metadata.root_turn_id());
+                    // Fast collaborator tools can complete before their sampling response.
+                    // Keep the event until that response can supply its originating ID.
+                    let emission =
+                        if matches!(&notification.item, ThreadItem::CollabAgentToolCall { .. }) {
+                            ToolEventEmission::AwaitResponse
+                        } else {
+                            ToolEventEmission::ImmediateUnlessCorrelated
+                        };
                     self.record_tool_event(
                         &notification.thread_id,
                         &notification.turn_id,
                         root_turn_id,
                         event,
-                        ToolEventEmission::ImmediateUnlessCorrelated,
+                        emission,
                         out,
                     );
                 }