diff --git a/codex-rs/analytics/src/analytics_client_tests.rs b/codex-rs/analytics/src/analytics_client_tests.rs
index bf11cba1e..cef51d4f1 100644
--- a/codex-rs/analytics/src/analytics_client_tests.rs
+++ b/codex-rs/analytics/src/analytics_client_tests.rs
@@ -177,6 +177,7 @@ fn sample_thread_with_metadata(
 ) -> Thread {
     Thread {
         id: thread_id.to_string(),
+        extra: None,
         session_id: format!("session-{thread_id}"),
         forked_from_id: None,
         parent_thread_id,
diff --git a/codex-rs/analytics/src/client_tests.rs b/codex-rs/analytics/src/client_tests.rs
index ce455ce5b..bbc5b5f0b 100644
--- a/codex-rs/analytics/src/client_tests.rs
+++ b/codex-rs/analytics/src/client_tests.rs
@@ -277,6 +277,7 @@ fn sample_thread_archive_request() -> ClientRequest {
 fn sample_thread(thread_id: &str) -> Thread {
     Thread {
         id: thread_id.to_string(),
+        extra: None,
         session_id: format!("session-{thread_id}"),
         forked_from_id: None,
         parent_thread_id: None,
diff --git a/codex-rs/app-server-protocol/schema/json/ServerNotification.json b/codex-rs/app-server-protocol/schema/json/ServerNotification.json
index 32ab0dd76..27753341b 100644
--- a/codex-rs/app-server-protocol/schema/json/ServerNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/ServerNotification.json
@@ -3765,6 +3765,10 @@
       ],
       "type": "object"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadGoal": {
       "properties": {
         "createdAt": {
diff --git a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json
index 606771338..8e1000aaa 100644
--- a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json
+++ b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json
@@ -17052,6 +17052,10 @@
         "title": "ThreadDeletedNotification",
         "type": "object"
       },
+      "ThreadExtra": {
+        "description": "Extra app-server data for a thread.",
+        "type": "object"
+      },
       "ThreadForkParams": {
         "$schema": "http://json-schema.org/draft-07/schema#",
         "description": "There are two ways to fork a thread: 1. By thread_id: load the thread from disk by thread_id and fork it into a new thread. 2. By path: load the thread from disk by path and fork it into a new thread.\n\nIf using a non-empty path, the thread_id param will be ignored. Empty string path values are treated as absent.\n\nPrefer using thread_id whenever possible.",
diff --git a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json
index 8dd07d44c..c98f7d44d 100644
--- a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json
+++ b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json
@@ -14831,6 +14831,10 @@
       "title": "ThreadDeletedNotification",
       "type": "object"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadForkParams": {
       "$schema": "http://json-schema.org/draft-07/schema#",
       "description": "There are two ways to fork a thread: 1. By thread_id: load the thread from disk by thread_id and fork it into a new thread. 2. By path: load the thread from disk by path and fork it into a new thread.\n\nIf using a non-empty path, the thread_id param will be ignored. Empty string path values are treated as absent.\n\nPrefer using thread_id whenever possible.",
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
index 27c4d9ab3..ac7790590 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
@@ -1165,6 +1165,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
index d06ee75c4..71e698e5a 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
@@ -972,6 +972,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
index ed63f1498..203e5e943 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
@@ -972,6 +972,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
index 51b3dbb27..17eb143f6 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
@@ -972,6 +972,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
index 5887ce383..6f9bf6811 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
@@ -1165,6 +1165,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
index fe235b41d..fd58f93e8 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
@@ -972,6 +972,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
index f8bf7bdd6..530ea8221 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
@@ -1165,6 +1165,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
index 457b081cd..b0bbf345d 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
@@ -972,6 +972,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
index 079bd0f8f..d311e3997 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
@@ -972,6 +972,10 @@
       ],
       "type": "string"
     },
+    "ThreadExtra": {
+      "description": "Extra app-server data for a thread.",
+      "type": "object"
+    },
     "ThreadId": {
       "type": "string"
     },
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/Thread.ts b/codex-rs/app-server-protocol/schema/typescript/v2/Thread.ts
index 06df74f0a..49e2411f4 100644
--- a/codex-rs/app-server-protocol/schema/typescript/v2/Thread.ts
+++ b/codex-rs/app-server-protocol/schema/typescript/v2/Thread.ts
@@ -8,91 +8,70 @@ import type { ThreadSource } from "./ThreadSource";
 import type { ThreadStatus } from "./ThreadStatus";
 import type { Turn } from "./Turn";
 
-export type Thread = {
-/**
+export type Thread = {/**
  * Identifier for this thread. Codex-generated thread IDs are UUIDv7.
  */
-id: string,
-/**
+id: string, /**
  * Session id shared by threads that belong to the same session tree.
  */
-sessionId: string,
-/**
+sessionId: string, /**
  * Source thread id when this thread was created by forking another thread.
  */
-forkedFromId: string | null,
-/**
+forkedFromId: string | null, /**
  * The ID of the parent thread. This will only be set if this thread is a subagent.
  */
-parentThreadId: string | null,
-/**
+parentThreadId: string | null, /**
  * Usually the first user message in the thread, if available.
  */
-preview: string,
-/**
+preview: string, /**
  * Whether the thread is ephemeral and should not be materialized on disk.
  */
-ephemeral: boolean,
-/**
+ephemeral: boolean, /**
  * Model provider used for this thread (for example, 'openai').
  */
-modelProvider: string,
-/**
+modelProvider: string, /**
  * Unix timestamp (in seconds) when the thread was created.
  */
-createdAt: number,
-/**
+createdAt: number, /**
  * Unix timestamp (in seconds) when the thread was last updated.
  */
-updatedAt: number,
-/**
+updatedAt: number, /**
  * Unix timestamp (in seconds) used for thread recency ordering.
  */
-recencyAt: number | null,
-/**
+recencyAt: number | null, /**
  * Current runtime status for the thread.
  */
-status: ThreadStatus,
-/**
+status: ThreadStatus, /**
  * [UNSTABLE] Path to the thread on disk.
  */
-path: string | null,
-/**
+path: string | null, /**
  * Working directory captured for the thread.
  */
-cwd: AbsolutePathBuf,
-/**
+cwd: AbsolutePathBuf, /**
  * Version of the CLI that created the thread.
  */
-cliVersion: string,
-/**
+cliVersion: string, /**
  * Origin of the thread (CLI, VSCode, codex exec, codex app-server, etc.).
  */
-source: SessionSource,
-/**
+source: SessionSource, /**
  * Optional analytics source classification for this thread.
  */
-threadSource: ThreadSource | null,
-/**
+threadSource: ThreadSource | null, /**
  * Optional random unique nickname assigned to an AgentControl-spawned sub-agent.
  */
-agentNickname: string | null,
-/**
+agentNickname: string | null, /**
  * Optional role (agent_role) assigned to an AgentControl-spawned sub-agent.
  */
-agentRole: string | null,
-/**
+agentRole: string | null, /**
  * Optional Git metadata captured when the thread was created.
  */
-gitInfo: GitInfo | null,
-/**
+gitInfo: GitInfo | null, /**
  * Optional user-facing thread title.
  */
-name: string | null,
-/**
+name: string | null, /**
  * Only populated on `thread/resume`, `thread/rollback`, `thread/fork`, and `thread/read`
  * (when `includeTurns` is true) responses.
  * For all other responses and notifications returning a Thread,
  * the turns field will be an empty list.
  */
-turns: Array<Turn>, };
+turns: Array<Turn>};
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/ThreadExtra.ts b/codex-rs/app-server-protocol/schema/typescript/v2/ThreadExtra.ts
new file mode 100644
index 000000000..aa35e45f0
--- /dev/null
+++ b/codex-rs/app-server-protocol/schema/typescript/v2/ThreadExtra.ts
@@ -0,0 +1,8 @@
+// GENERATED CODE! DO NOT MODIFY BY HAND!
+
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+/**
+ * Extra app-server data for a thread.
+ */
+export type ThreadExtra = Record<string, never>;
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/index.ts b/codex-rs/app-server-protocol/schema/typescript/v2/index.ts
index 3e769d3fa..57c08391c 100644
--- a/codex-rs/app-server-protocol/schema/typescript/v2/index.ts
+++ b/codex-rs/app-server-protocol/schema/typescript/v2/index.ts
@@ -395,6 +395,7 @@ export type { ThreadCompactStartResponse } from "./ThreadCompactStartResponse";
 export type { ThreadDeleteParams } from "./ThreadDeleteParams";
 export type { ThreadDeleteResponse } from "./ThreadDeleteResponse";
 export type { ThreadDeletedNotification } from "./ThreadDeletedNotification";
+export type { ThreadExtra } from "./ThreadExtra";
 export type { ThreadForkParams } from "./ThreadForkParams";
 export type { ThreadForkResponse } from "./ThreadForkResponse";
 export type { ThreadGoal } from "./ThreadGoal";
diff --git a/codex-rs/app-server-protocol/src/protocol/common.rs b/codex-rs/app-server-protocol/src/protocol/common.rs
index 5ee6ec25a..7fe20a84d 100644
--- a/codex-rs/app-server-protocol/src/protocol/common.rs
+++ b/codex-rs/app-server-protocol/src/protocol/common.rs
@@ -2573,6 +2573,7 @@ mod tests {
             response: v2::ThreadStartResponse {
                 thread: v2::Thread {
                     id: "67e55044-10b1-426f-9247-bb680e5fe0c8".to_string(),
+                    extra: None,
                     session_id: "67e55044-10b1-426f-9247-bb680e5fe0c7".to_string(),
                     forked_from_id: None,
                     parent_thread_id: None,
@@ -2622,6 +2623,7 @@ mod tests {
                 "response": {
                     "thread": {
                         "id": "67e55044-10b1-426f-9247-bb680e5fe0c8",
+                        "extra": null,
                         "sessionId": "67e55044-10b1-426f-9247-bb680e5fe0c7",
                         "forkedFromId": null,
                         "parentThreadId": null,
diff --git a/codex-rs/app-server-protocol/src/protocol/v2/tests.rs b/codex-rs/app-server-protocol/src/protocol/v2/tests.rs
index 533e775e6..96ba99577 100644
--- a/codex-rs/app-server-protocol/src/protocol/v2/tests.rs
+++ b/codex-rs/app-server-protocol/src/protocol/v2/tests.rs
@@ -168,6 +168,7 @@ fn thread_resume_response_round_trips_initial_turns_page() {
     let response = ThreadResumeResponse {
         thread: Thread {
             id: "thr_123".to_string(),
+            extra: None,
             session_id: "thr_123".to_string(),
             forked_from_id: None,
             parent_thread_id: None,
diff --git a/codex-rs/app-server-protocol/src/protocol/v2/thread_data.rs b/codex-rs/app-server-protocol/src/protocol/v2/thread_data.rs
index 176172dd8..3338513df 100644
--- a/codex-rs/app-server-protocol/src/protocol/v2/thread_data.rs
+++ b/codex-rs/app-server-protocol/src/protocol/v2/thread_data.rs
@@ -2,6 +2,7 @@ use super::CodexErrorInfo;
 use super::ThreadItem;
 use super::ThreadStatus;
 use super::TurnStatus;
+use codex_experimental_api_macros::ExperimentalApi;
 use codex_protocol::protocol::SessionSource as CoreSessionSource;
 use codex_protocol::protocol::SubAgentSource as CoreSubAgentSource;
 use codex_protocol::protocol::ThreadSource as CoreThreadSource;
@@ -120,6 +121,12 @@ impl From<ThreadSource> for CoreThreadSource {
     }
 }
 
+/// Extra app-server data for a thread.
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, JsonSchema, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(rename_all = "camelCase", export_to = "v2/")]
+pub struct ThreadExtra {}
+
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, JsonSchema, TS)]
 #[serde(rename_all = "camelCase")]
 #[ts(export_to = "v2/")]
@@ -129,12 +136,15 @@ pub struct GitInfo {
     pub origin_url: Option<String>,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS)]
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS, ExperimentalApi)]
 #[serde(rename_all = "camelCase")]
 #[ts(export_to = "v2/")]
 pub struct Thread {
     /// Identifier for this thread. Codex-generated thread IDs are UUIDv7.
     pub id: String,
+    /// Optional implementation-specific thread data.
+    #[experimental("thread.extra")]
+    pub extra: Option<ThreadExtra>,
     /// Session id shared by threads that belong to the same session tree.
     pub session_id: String,
     /// Source thread id when this thread was created by forking another thread.
diff --git a/codex-rs/app-server/src/request_processors/thread_processor.rs b/codex-rs/app-server/src/request_processors/thread_processor.rs
index a59bb530d..89ef93f63 100644
--- a/codex-rs/app-server/src/request_processors/thread_processor.rs
+++ b/codex-rs/app-server/src/request_processors/thread_processor.rs
@@ -4156,6 +4156,7 @@ pub(crate) fn thread_from_stored_thread(
     let thread_id = thread.thread_id.to_string();
     let thread = Thread {
         id: thread_id.clone(),
+        extra: None,
         session_id: thread_id,
         forked_from_id: thread.forked_from_id.map(|id| id.to_string()),
         parent_thread_id: thread.parent_thread_id.map(|id| id.to_string()),
@@ -4366,6 +4367,7 @@ fn build_thread_from_snapshot(
     let now = time::OffsetDateTime::now_utc().unix_timestamp();
     Thread {
         id: thread_id.to_string(),
+        extra: None,
         session_id,
         forked_from_id: None,
         parent_thread_id: config_snapshot.parent_thread_id.map(|id| id.to_string()),
diff --git a/codex-rs/app-server/src/request_processors/thread_resume_redaction.rs b/codex-rs/app-server/src/request_processors/thread_resume_redaction.rs
index b7d864069..586828e8d 100644
--- a/codex-rs/app-server/src/request_processors/thread_resume_redaction.rs
+++ b/codex-rs/app-server/src/request_processors/thread_resume_redaction.rs
@@ -183,6 +183,7 @@ mod tests {
     fn test_thread(items: Vec<ThreadItem>) -> Thread {
         Thread {
             id: "thread-1".to_string(),
+            extra: None,
             session_id: "session-1".to_string(),
             forked_from_id: None,
             parent_thread_id: None,
diff --git a/codex-rs/app-server/src/request_processors/thread_summary.rs b/codex-rs/app-server/src/request_processors/thread_summary.rs
index bb2c6708c..3b668e0a1 100644
--- a/codex-rs/app-server/src/request_processors/thread_summary.rs
+++ b/codex-rs/app-server/src/request_processors/thread_summary.rs
@@ -314,6 +314,7 @@ pub(crate) fn summary_to_thread(
     let thread_id = conversation_id.to_string();
     Thread {
         id: thread_id.clone(),
+        extra: None,
         session_id: thread_id,
         forked_from_id: None,
         parent_thread_id: None,
diff --git a/codex-rs/app-server/src/thread_status.rs b/codex-rs/app-server/src/thread_status.rs
index a5997a58f..32b79e1f6 100644
--- a/codex-rs/app-server/src/thread_status.rs
+++ b/codex-rs/app-server/src/thread_status.rs
@@ -889,6 +889,7 @@ mod tests {
     fn test_thread(thread_id: &str, source: codex_app_server_protocol::SessionSource) -> Thread {
         Thread {
             id: thread_id.to_string(),
+            extra: None,
             session_id: thread_id.to_string(),
             forked_from_id: None,
             parent_thread_id: None,
diff --git a/codex-rs/exec/src/lib_tests.rs b/codex-rs/exec/src/lib_tests.rs
index 4e341d773..9f345eb33 100644
--- a/codex-rs/exec/src/lib_tests.rs
+++ b/codex-rs/exec/src/lib_tests.rs
@@ -334,6 +334,7 @@ async fn resume_lookup_model_providers_filters_only_last_lookup() {
 fn turn_items_for_thread_returns_matching_turn_items() {
     let thread = AppServerThread {
         id: "thread-1".to_string(),
+        extra: None,
         session_id: "thread-1".to_string(),
         forked_from_id: None,
         parent_thread_id: None,
@@ -753,6 +754,7 @@ fn sample_thread_start_response() -> ThreadStartResponse {
     ThreadStartResponse {
         thread: codex_app_server_protocol::Thread {
             id: "67e55044-10b1-426f-9247-bb680e5fe0c8".to_string(),
+            extra: None,
             session_id: "67e55044-10b1-426f-9247-bb680e5fe0c7".to_string(),
             forked_from_id: None,
             parent_thread_id: None,
diff --git a/codex-rs/tui/src/app/loaded_threads.rs b/codex-rs/tui/src/app/loaded_threads.rs
index 6bd260c0b..8e790170e 100644
--- a/codex-rs/tui/src/app/loaded_threads.rs
+++ b/codex-rs/tui/src/app/loaded_threads.rs
@@ -128,6 +128,7 @@ mod tests {
     fn test_thread(thread_id: ThreadId, source: SessionSource) -> Thread {
         Thread {
             id: thread_id.to_string(),
+            extra: None,
             session_id: thread_id.to_string(),
             forked_from_id: None,
             parent_thread_id: None,
diff --git a/codex-rs/tui/src/app/tests.rs b/codex-rs/tui/src/app/tests.rs
index 6c55accab..21aca66bc 100644
--- a/codex-rs/tui/src/app/tests.rs
+++ b/codex-rs/tui/src/app/tests.rs
@@ -2874,6 +2874,7 @@ async fn inactive_thread_started_notification_initializes_replay_session() -> Re
         ServerNotification::ThreadStarted(ThreadStartedNotification {
             thread: Thread {
                 id: agent_thread_id.to_string(),
+                extra: None,
                 session_id: agent_thread_id.to_string(),
                 forked_from_id: None,
                 parent_thread_id: None,
@@ -2967,6 +2968,7 @@ async fn inactive_thread_started_notification_preserves_primary_model_when_path_
         ServerNotification::ThreadStarted(ThreadStartedNotification {
             thread: Thread {
                 id: agent_thread_id.to_string(),
+                extra: None,
                 session_id: agent_thread_id.to_string(),
                 forked_from_id: None,
                 parent_thread_id: None,
@@ -3027,6 +3029,7 @@ async fn thread_read_session_state_does_not_reuse_primary_permission_profile() {
 
     let thread = Thread {
         id: read_thread_id.to_string(),
+        extra: None,
         session_id: read_thread_id.to_string(),
         forked_from_id: None,
         parent_thread_id: None,
@@ -5640,6 +5643,7 @@ async fn thread_rollback_response_discards_queued_active_thread_events() {
         &ThreadRollbackResponse {
             thread: Thread {
                 id: thread_id.to_string(),
+                extra: None,
                 session_id: thread_id.to_string(),
                 forked_from_id: None,
                 parent_thread_id: None,
diff --git a/codex-rs/tui/src/app/thread_session_state.rs b/codex-rs/tui/src/app/thread_session_state.rs
index ceafb71db..58412bff0 100644
--- a/codex-rs/tui/src/app/thread_session_state.rs
+++ b/codex-rs/tui/src/app/thread_session_state.rs
@@ -409,6 +409,7 @@ mod tests {
         };
         let read_thread = Thread {
             id: read_thread_id.to_string(),
+            extra: None,
             session_id: read_thread_id.to_string(),
             forked_from_id: None,
             parent_thread_id: None,
diff --git a/codex-rs/tui/src/app_server_session.rs b/codex-rs/tui/src/app_server_session.rs
index 527cde57e..7181d1a56 100644
--- a/codex-rs/tui/src/app_server_session.rs
+++ b/codex-rs/tui/src/app_server_session.rs
@@ -2320,6 +2320,7 @@ mod tests {
         let response = ThreadResumeResponse {
             thread: codex_app_server_protocol::Thread {
                 id: thread_id.to_string(),
+                extra: None,
                 session_id: ThreadId::new().to_string(),
                 forked_from_id: Some(forked_from_id.to_string()),
                 parent_thread_id: None,
diff --git a/codex-rs/tui/src/resume_picker.rs b/codex-rs/tui/src/resume_picker.rs
index 08191eaf2..888cc5b27 100644
--- a/codex-rs/tui/src/resume_picker.rs
+++ b/codex-rs/tui/src/resume_picker.rs
@@ -5720,6 +5720,7 @@ session_picker_view = "dense"
         let thread_id = ThreadId::new();
         let thread = Thread {
             id: thread_id.to_string(),
+            extra: None,
             session_id: thread_id.to_string(),
             forked_from_id: None,
             parent_thread_id: None,
@@ -5756,6 +5757,7 @@ session_picker_view = "dense"
         let thread_id = ThreadId::new();
         let thread = Thread {
             id: thread_id.to_string(),
+            extra: None,
             session_id: thread_id.to_string(),
             forked_from_id: None,
             parent_thread_id: None,
@@ -5826,6 +5828,7 @@ session_picker_view = "dense"
         let thread_id = ThreadId::new();
         let thread = Thread {
             id: thread_id.to_string(),
+            extra: None,
             session_id: thread_id.to_string(),
             forked_from_id: None,
             parent_thread_id: None,
@@ -5885,6 +5888,7 @@ session_picker_view = "dense"
         let thread_id = ThreadId::new();
         let thread = Thread {
             id: thread_id.to_string(),
+            extra: None,
             session_id: thread_id.to_string(),
             forked_from_id: None,
             parent_thread_id: None,