diff --git a/apps/ai-game-creator-shell/src/App.tsx b/apps/ai-game-creator-shell/src/App.tsx
index 2438d17f8..ee075cfa5 100644
--- a/apps/ai-game-creator-shell/src/App.tsx
+++ b/apps/ai-game-creator-shell/src/App.tsx
@@ -244,6 +244,7 @@ import {
   type DirectThreadSubscriptionBootstrap,
   isDirectTurnInProgress,
 } from './features/project-workspace/directThreadEvents';
+import { normalizeDirectTimestamp } from './features/project-workspace/directTurnPresentation';
 import type { DirectCodexUserContentPart } from './features/project-workspace/generated';
 import {
   appendMemoryContent,
@@ -1010,6 +1011,8 @@ export function App({
       const normalized: GameCreatorDirectToolCall = {
         ...call,
         id,
+        startedAt: normalizeDirectTimestamp(call.startedAt),
+        updatedAt: normalizeDirectTimestamp(call.updatedAt),
         detail: call.detail ?? { changes: [] },
       };
       // 起点时间取更早的那个：`completed` 事件不一定带 startedAt。
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts b/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts
index 217646a9f..2449331d5 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts
@@ -26,7 +26,8 @@ export type DirectTurnPresentation = {
   endedAt: number;
 };
 
-export function directMessageTimestamp(value: number | undefined) {
+/** 统一 Direct 时间戳为 Unix 毫秒；历史/异常 payload 可能传 Unix 秒。 */
+export function normalizeDirectTimestamp(value: number | undefined) {
   const timestamp =
     value && Number.isFinite(value) && value > 0
       ? value < 100_000_000_000
@@ -36,6 +37,8 @@ export function directMessageTimestamp(value: number | undefined) {
   return Number.isFinite(new Date(timestamp).getTime()) ? timestamp : 0;
 }
 
+export const directMessageTimestamp = normalizeDirectTimestamp;
+
 /** 从唯一呈现来源分区，完成后只把最终回复及失败提示留在过程折叠区之外。 */
 export function splitDirectTurnContent(turn: DirectTurnPresentation) {
   const assistants = turn.messages.filter(
diff --git a/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts b/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts
index 74d8c8426..f47f263a2 100644
--- a/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts
+++ b/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts
@@ -8,6 +8,7 @@ import type {
 import {
   buildDirectTurnPresentations,
   directMessageTimestamp,
+  normalizeDirectTimestamp,
   splitDirectTurnContent,
 } from '../src/features/project-workspace/directTurnPresentation';
 
@@ -58,6 +59,12 @@ const build = (
   });
 
 describe('DirectProject 回合唯一呈现', () => {
+  it('把 Unix 秒时间戳归一化为毫秒，已有毫秒值保持不变', () => {
+    expect(normalizeDirectTimestamp(1_800_000_000)).toBe(1_800_000_000_000);
+    expect(normalizeDirectTimestamp(1_800_000_000_000)).toBe(1_800_000_000_000);
+    expect(directMessageTimestamp(1_800_000_000)).toBe(1_800_000_000_000);
+  });
+
   it('历史仍有未加载切片时，不把那些回合的工具流追加到当前页末尾', () => {
     const rows = build(
       [user('one')],