diff --git a/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-experimental.json.zst b/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-experimental.json.zst
index 708b89be3b..9eda51adc9 100644
Binary files a/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-experimental.json.zst and b/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-experimental.json.zst differ
diff --git a/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-stable.json.zst b/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-stable.json.zst
index d194c82851..e199e847d5 100644
Binary files a/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-stable.json.zst and b/codex-rs/app-server-protocol/schema/precomputed/app-server-exports-stable.json.zst differ
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/ThreadItem.ts b/codex-rs/app-server-protocol/schema/typescript/v2/ThreadItem.ts
index 5338795c96..f93eda554e 100644
--- a/codex-rs/app-server-protocol/schema/typescript/v2/ThreadItem.ts
+++ b/codex-rs/app-server-protocol/schema/typescript/v2/ThreadItem.ts
@@ -38,11 +38,11 @@ export type ThreadItem = {
 /**
  * Unix timestamp in milliseconds when the item started, if recorded.
  */
-startedAtMs: number | null,
+startedAtMs?: number | null,
 /**
  * Unix timestamp in milliseconds when the item completed, if recorded.
  */
-completedAtMs: number | null, } & ({ "type": "userMessage", id: string, clientId: string | null, content: Array<UserInput>, } | { "type": "hookPrompt", id: string, fragments: Array<HookPromptFragment>, } | { "type": "agentMessage", id: string, text: string, phase: MessagePhase | null, memoryCitation: MemoryCitation | null, delivery: AgentMessageDelivery | null, questions: Array<AsyncUserInputQuestion> | null, } | { "type": "functionCallOutput", id: string, name: string, namespace: string | null, output: FunctionCallOutputBody, } | { "type": "plan", id: string, text: string, } | { "type": "reasoning", id: string, summary: Array<string>, content: Array<string>, } | { "type": "commandExecution", id: string,
+completedAtMs?: number | null, } & ({ "type": "userMessage", id: string, clientId: string | null, content: Array<UserInput>, } | { "type": "hookPrompt", id: string, fragments: Array<HookPromptFragment>, } | { "type": "agentMessage", id: string, text: string, phase: MessagePhase | null, memoryCitation: MemoryCitation | null, delivery: AgentMessageDelivery | null, questions: Array<AsyncUserInputQuestion> | null, } | { "type": "functionCallOutput", id: string, name: string, namespace: string | null, output: FunctionCallOutputBody, } | { "type": "plan", id: string, text: string, } | { "type": "reasoning", id: string, summary: Array<string>, content: Array<string>, } | { "type": "commandExecution", id: string,
 /**
  * Trusted first-party plugin id when this command resolves to one plugin script.
  */
diff --git a/codex-rs/app-server-protocol/src/export.rs b/codex-rs/app-server-protocol/src/export.rs
index 6e1e5f48be..0e0ebe9e5d 100644
--- a/codex-rs/app-server-protocol/src/export.rs
+++ b/codex-rs/app-server-protocol/src/export.rs
@@ -2411,6 +2411,8 @@ mod tests {
                     && field_prefix.trim() == "threadUsage?")
                     || (path == Path::new("v2/ThreadUsage.ts")
                         && field_prefix.trim() == "nativeUsageUsdMicros?")
+                    || (path == Path::new("v2/ThreadItem.ts")
+                        && matches!(field_prefix.trim(), "startedAtMs?" | "completedAtMs?"))
                     || (path == Path::new("v2/McpServerOauthLoginCompletedNotification.ts")
                         && field_prefix.trim() == "loginId?")
                     || (path == Path::new("v2/MisalignmentErrorDetails.ts")
diff --git a/codex-rs/app-server-protocol/src/protocol/v2/item.rs b/codex-rs/app-server-protocol/src/protocol/v2/item.rs
index 8997b722e2..f496ef172b 100644
--- a/codex-rs/app-server-protocol/src/protocol/v2/item.rs
+++ b/codex-rs/app-server-protocol/src/protocol/v2/item.rs
@@ -240,11 +240,11 @@ pub struct ThreadItem {
     pub payload: ThreadItemPayload,
     /// Unix timestamp in milliseconds when the item started, if recorded.
     #[serde(default)]
-    #[ts(type = "number | null")]
+    #[ts(type = "number | null", optional)]
     pub started_at_ms: Option<i64>,
     /// Unix timestamp in milliseconds when the item completed, if recorded.
     #[serde(default)]
-    #[ts(type = "number | null")]
+    #[ts(type = "number | null", optional)]
     pub completed_at_ms: Option<i64>,
 }