diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectComposer/ComposerControls.tsx b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectComposer/ComposerControls.tsx
index bc1ea595a..215766274 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectComposer/ComposerControls.tsx
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectComposer/ComposerControls.tsx
@@ -32,6 +32,7 @@ import {
   DEFAULT_COMPOSER_REASONING_EFFORT,
   normalizeComposerReasoningEffort,
 } from '../../../../../features/project-workspace/composerReasoningEffort';
+import { LLM_CONFIG_CHANGED_EVENT } from '../../../../../services/llmModelCatalog';
 import type { DirectPendingTurn } from '../../conversation/directPendingTurns';
 import {
   resolveSpeechRecognitionCtor,
@@ -383,28 +384,52 @@ export function ComposerReasoningEffortSelect({
     };
   }, []);
 
-  useEffect(() => {
-    let cancelled = false;
+  /*
+    读一次配置：种「最近落盘值」并在空闲时回显。
+    —— 配置有**别的写入者**（运行配置对话框改 `llm.reasoningEffort` 后 `notifyLlmConfigChanged()`，
+    也可能在窗口失焦期间被改）。只在挂载时读一次会让「最近落盘值」过期：用户重选**同一档**会被
+    去重跳过，界面显示 A、磁盘却是 B。所以挂载、`LLM_CONFIG_CHANGED_EVENT`、窗口重新获得焦点
+    时都重读一次（**只读不写盘**），重新种 `persistedEffortRef`。
+    —— 写盘在途或拖动预览未提交时不回显（回读拿到的还是旧值，回显会让界面闪一下）。
+  */
+  const writeInFlightRef = useRef(0);
+  const readEffortRef = useRef<(silent?: boolean) => void>(() => undefined);
+  readEffortRef.current = (silent = false) => {
     const invoke = resolveTauriInvoke();
     if (!invoke) {
-      return undefined;
+      return;
     }
     void invoke<GameCreatorAppConfigView>('read_game_creator_app_config')
       .then((view) => {
-        if (cancelled || !mountedRef.current) return;
+        if (!mountedRef.current) return;
         const read = normalizeComposerReasoningEffort(
           view?.config?.llm?.reasoningEffort,
         );
         // 回读值就是"磁盘上的档位"：把它登记成最近落盘值，之后提交同一档位不再写盘。
         persistedEffortRef.current = read;
+        if (writeInFlightRef.current > 0 || previewEffortRef.current !== null) {
+          return;
+        }
         setEffort(read);
       })
       .catch(() => {
-        if (cancelled || !mountedRef.current) return;
+        if (!mountedRef.current || silent) return;
         setNotice('推理档读取失败');
       });
+  };
+
+  useEffect(() => {
+    readEffortRef.current();
+  }, []);
+
+  useEffect(() => {
+    // 外部写入者改档 / 窗口重新获得焦点：重读一次让「最近落盘值」跟上，避免去重吞掉真实改档。
+    const reread = () => readEffortRef.current(true);
+    window.addEventListener(LLM_CONFIG_CHANGED_EVENT, reread);
+    window.addEventListener('focus', reread);
     return () => {
-      cancelled = true;
+      window.removeEventListener(LLM_CONFIG_CHANGED_EVENT, reread);
+      window.removeEventListener('focus', reread);
     };
   }, []);
 
diff --git a/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts
index fff8566a4..dc4e6440a 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/chat-composer.suite.ts
@@ -1,6 +1,7 @@
 import { ConversationModelSelect } from '../../src/features/project-workspace/ConversationModelSelect';
 import { userItemFromContent } from '../../src/features/project-workspace/resourceReferences';
 import {
+  LLM_CONFIG_CHANGED_EVENT,
   LlmModelCatalogConfigError,
   resetLlmModelCatalogCacheForTest,
 } from '../../src/services/llmModelCatalog';
@@ -1279,6 +1280,101 @@ export function registerChatComposerControlTests() {
     });
   });
 
+  it('strength slider: an external config change is re-read so re-selecting that grade still commits', async () => {
+    // 配置还有别的写入者（`RuntimeConfigDialog` 保存后 `notifyLlmConfigChanged()`）。组件必须重读
+    // 配置并重新种「最近落盘值」，否则外部把档位改成「最高」后用户再选「高」会被去重跳过：
+    // 界面显示高、磁盘仍是最高（旧实现在这条用例里 writes 不含 'high'）。
+    let stored = 'default';
+    const writes: string[] = [];
+    const invoke = vi.fn(
+      async (command: string, args?: Record<string, unknown>) => {
+        if (command === 'read_game_creator_app_config') {
+          return gameCreatorConfigView(stored);
+        }
+        if (command === 'select_game_creator_reasoning_effort') {
+          writes.push(String(args?.effort ?? ''));
+          stored = String(args?.effort ?? '');
+          return gameCreatorConfigView(stored);
+        }
+        return null;
+      },
+    );
+    installTauriRuntime({
+      core: { invoke },
+      event: { listen: async () => () => undefined },
+    });
+    render(
+      React.createElement(ComposerReasoningEffortSelect, {
+        disabled: false,
+        presentation: 'section',
+      }),
+    );
+    const slider = (await screen.findByRole('slider', {
+      name: '思维强度',
+    })) as HTMLInputElement;
+    await waitFor(() =>
+      expect(slider.getAttribute('aria-valuetext')).toBe('默认'),
+    );
+
+    // 外部改档（另一处写完配置会派发这个事件）：组件重读并回显成「最高」。
+    stored = 'max';
+    await act(async () => {
+      window.dispatchEvent(new Event(LLM_CONFIG_CHANGED_EVENT));
+      await Promise.resolve();
+    });
+    await waitFor(() =>
+      expect(slider.getAttribute('aria-valuetext')).toBe('最高'),
+    );
+
+    // 用户改选「高」：仍然要真落盘一次（档位枚举 0=默认 1=低 2=中 3=高 4=最高）。
+    fireEvent.input(slider, { target: { value: '3' } });
+    fireEvent.keyUp(slider);
+    await waitFor(() => expect(writes).toEqual(['high']));
+    expect(stored).toBe('high');
+  });
+
+  it('strength slider: pointercancel commits the pending preview once', async () => {
+    // 触屏取消（pointercancel）与「松手即提交」同一口径：预览值不能滞留到下一次提交或卸载 flush。
+    // jsdom 没有 PointerEvent，这里派发同名原生事件（React 的合成 handler 按事件名分发）。
+    const writes: string[] = [];
+    const invoke = vi.fn(
+      async (command: string, args?: Record<string, unknown>) => {
+        if (command === 'select_game_creator_reasoning_effort') {
+          writes.push(String(args?.effort ?? ''));
+          return gameCreatorConfigView(String(args?.effort ?? ''));
+        }
+        if (command === 'read_game_creator_app_config') {
+          return gameCreatorConfigView('default');
+        }
+        return null;
+      },
+    );
+    installTauriRuntime({
+      core: { invoke },
+      event: { listen: async () => () => undefined },
+    });
+    render(
+      React.createElement(ComposerReasoningEffortSelect, {
+        disabled: false,
+        presentation: 'section',
+      }),
+    );
+    const slider = (await screen.findByRole('slider', {
+      name: '思维强度',
+    })) as HTMLInputElement;
+    await waitFor(() =>
+      expect(slider.getAttribute('aria-valuetext')).toBe('默认'),
+    );
+
+    fireEvent.input(slider, { target: { value: '2' } });
+    expect(writes, '拖动过程中不落盘').toEqual([]);
+    await act(async () => {
+      slider.dispatchEvent(new Event('pointercancel', { bubbles: true }));
+      await Promise.resolve();
+    });
+    await waitFor(() => expect(writes).toEqual(['medium']));
+  });
+
   it('shows model service unavailability as a toast and leaves no persistent line', async () => {
     const { surface } = await openDirectCodexSurface({
       load_game_creator_llm_models: () => {