diff --git a/codex-rs/analytics/src/analytics_client_tests.rs b/codex-rs/analytics/src/analytics_client_tests.rs
index 32cfb36aa5..a89e684aa2 100644
--- a/codex-rs/analytics/src/analytics_client_tests.rs
+++ b/codex-rs/analytics/src/analytics_client_tests.rs
@@ -1622,6 +1622,10 @@ async fn accepted_turn_steer_emits_expected_event() {
         payload["event_params"]["runtime"]["codex_rs_version"],
         json!("0.1.0")
     );
+    assert_eq!(payload["event_params"]["thread_source"], json!("user"));
+    assert_eq!(payload["event_params"]["initialization_mode"], json!("new"));
+    assert_eq!(payload["event_params"]["subagent_source"], json!(null));
+    assert_eq!(payload["event_params"]["parent_thread_id"], json!(null));
     assert!(payload["event_params"].get("product_client_id").is_none());
 }
 
@@ -1650,6 +1654,10 @@ async fn rejected_turn_steer_uses_request_connection_metadata() {
         payload["event_params"]["runtime"]["codex_rs_version"],
         json!("0.1.0")
     );
+    assert_eq!(payload["event_params"]["thread_source"], json!("user"));
+    assert_eq!(payload["event_params"]["initialization_mode"], json!("new"));
+    assert_eq!(payload["event_params"]["subagent_source"], json!(null));
+    assert_eq!(payload["event_params"]["parent_thread_id"], json!(null));
     assert_eq!(payload["event_params"]["result"], json!("rejected"));
     assert_eq!(
         payload["event_params"]["rejection_reason"],
diff --git a/codex-rs/analytics/src/events.rs b/codex-rs/analytics/src/events.rs
index 4bc3ccde9d..74105a742d 100644
--- a/codex-rs/analytics/src/events.rs
+++ b/codex-rs/analytics/src/events.rs
@@ -213,6 +213,10 @@ pub(crate) struct CodexTurnSteerEventParams {
     pub(crate) accepted_turn_id: Option<String>,
     pub(crate) app_server_client: CodexAppServerClientMetadata,
     pub(crate) runtime: CodexRuntimeMetadata,
+    pub(crate) thread_source: Option<String>,
+    pub(crate) initialization_mode: ThreadInitializationMode,
+    pub(crate) subagent_source: Option<String>,
+    pub(crate) parent_thread_id: Option<String>,
     pub(crate) num_input_images: usize,
     pub(crate) result: TurnSteerResult,
     pub(crate) rejection_reason: Option<TurnSteerRejectionReason>,
@@ -351,6 +355,10 @@ pub(crate) fn codex_turn_steer_event_params(
     app_server_client: CodexAppServerClientMetadata,
     runtime: CodexRuntimeMetadata,
     tracking: &TrackEventsContext,
+    thread_source: Option<&'static str>,
+    initialization_mode: ThreadInitializationMode,
+    subagent_source: Option<String>,
+    parent_thread_id: Option<String>,
     turn_steer: CodexTurnSteerEvent,
 ) -> CodexTurnSteerEventParams {
     CodexTurnSteerEventParams {
@@ -359,6 +367,10 @@ pub(crate) fn codex_turn_steer_event_params(
         accepted_turn_id: turn_steer.accepted_turn_id,
         app_server_client,
         runtime,
+        thread_source: thread_source.map(str::to_string),
+        initialization_mode,
+        subagent_source,
+        parent_thread_id,
         num_input_images: turn_steer.num_input_images,
         result: turn_steer.result,
         rejection_reason: turn_steer.rejection_reason,
diff --git a/codex-rs/analytics/src/reducer.rs b/codex-rs/analytics/src/reducer.rs
index d88a4f9bb2..00e4b7abd7 100644
--- a/codex-rs/analytics/src/reducer.rs
+++ b/codex-rs/analytics/src/reducer.rs
@@ -723,6 +723,13 @@ impl AnalyticsReducer {
         let Some(connection_state) = self.connections.get(&connection_id) else {
             return;
         };
+        let Some(thread_metadata) = self.thread_metadata.get(&pending_request.thread_id) else {
+            tracing::warn!(
+                thread_id = %pending_request.thread_id,
+                "dropping turn steer analytics event: missing thread lifecycle metadata"
+            );
+            return;
+        };
         let tracking = TrackEventsContext {
             model_slug: String::new(),
             thread_id: pending_request.thread_id,
@@ -745,6 +752,10 @@ impl AnalyticsReducer {
                 connection_state.app_server_client.clone(),
                 connection_state.runtime.clone(),
                 &tracking,
+                thread_metadata.thread_source,
+                thread_metadata.initialization_mode,
+                thread_metadata.subagent_source.clone(),
+                thread_metadata.parent_thread_id.clone(),
                 turn_steer,
             ),
         }));