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 31c7bd694..cccb0b5a3 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
@@ -328,14 +328,24 @@ export function ComposerReasoningEffortSelect({
   );
   const [saving, setSaving] = useState(false);
   const [notice, setNotice] = useState('');
+  /*
+    拖动中的预览档位：`input` 只更新它（视觉立刻跟手），松手 / 抬键才真正落盘。
+    这样写盘不会发生在拖动过程中——写盘会置 `saving`，一旦用它 disable 掉原生 range，
+    浏览器会当场中断正在进行的拖拽（实测：拖动 6 步只收到 1 个 input 事件，
+    圆钮停在第一格不动）。
+  */
+  const [previewEffort, setPreviewEffort] =
+    useState<GameCreatorLlmReasoningEffort | null>(null);
+  const previewEffortRef = useRef<GameCreatorLlmReasoningEffort | null>(null);
   const writeChainRef = useRef<Promise<unknown>>(Promise.resolve());
   const mountedRef = useRef(true);
   const options = composerReasoningEffortOptions();
+  const shownEffort = previewEffort ?? effort;
   const activeIndex = Math.max(
     0,
-    options.findIndex((option) => option.value === effort),
+    options.findIndex((option) => option.value === shownEffort),
   );
-  const activeLabel = options[activeIndex]?.label ?? effort;
+  const activeLabel = options[activeIndex]?.label ?? shownEffort;
 
   useEffect(() => {
     mountedRef.current = true;
@@ -344,6 +354,25 @@ export function ComposerReasoningEffortSelect({
     };
   }, []);
 
+  /*
+    落盘时机交给原生 `change`：range 的 `change` 就是"值被提交"那一刻（鼠标松手 /
+    键盘一次调整），`input` 才是拖动过程中的连续事件。React 的 `onChange` 对 range
+    映射的是 `input`（连续），所以这里直接挂原生监听，避免把连续事件当成提交。
+  */
+  const rangeRef = useRef<HTMLInputElement | null>(null);
+  const commitPreviewRef = useRef<() => void>(() => undefined);
+  useEffect(() => {
+    const node = rangeRef.current;
+    if (!node) {
+      return undefined;
+    }
+    const handleChange = () => commitPreviewRef.current();
+    node.addEventListener('change', handleChange);
+    return () => {
+      node.removeEventListener('change', handleChange);
+    };
+  }, []);
+
   useEffect(() => {
     let cancelled = false;
     const invoke = resolveTauriInvoke();
@@ -405,6 +434,27 @@ export function ComposerReasoningEffortSelect({
       });
   }
 
+  /** 拖动中的连续事件只改预览：视觉立刻跟手，落盘留到松手那一刻。 */
+  function previewFromEvent(event: { currentTarget: HTMLInputElement }) {
+    const next = options[Number(event.currentTarget.value)];
+    if (!next || next.value === shownEffort) {
+      return;
+    }
+    previewEffortRef.current = next.value;
+    setPreviewEffort(next.value);
+  }
+
+  /** 松手 / 抬键 / 失焦时把预览落盘（一个手势只写一次）。 */
+  function commitPreview() {
+    const next = previewEffortRef.current;
+    previewEffortRef.current = null;
+    setPreviewEffort(null);
+    if (next && next !== effort) {
+      selectEffort(next);
+    }
+  }
+  commitPreviewRef.current = commitPreview;
+
   /*
     下拉形态（策划等宿主原样沿用）：与模型选择器同一套观感，复用 `conversation-model-*`
     的触发钮与浮层样式。
@@ -480,6 +530,7 @@ export function ComposerReasoningEffortSelect({
         {/* 原生 range 的 role/值域本来就成立，这里再显式写一遍：`aria-valuetext` 是
             中文档位名，读屏念的是「最高」而不是「4」。 */}
         <input
+          ref={rangeRef}
           type="range"
           className="project-chat-composer-strength-range"
           min={0}
@@ -497,13 +548,16 @@ export function ComposerReasoningEffortSelect({
           aria-valuemax={options.length - 1}
           aria-valuenow={activeIndex}
           aria-valuetext={activeLabel}
-          disabled={disabled || saving}
-          onChange={(event) => {
-            const next = options[Number(event.currentTarget.value)];
-            if (next && next.value !== effort) {
-              selectEffort(next.value);
-            }
-          }}
+          /* 拖动中保持可用（写盘只在松手后发生），视觉靠预览值跟手。
+             `onInput`（浏览器里连续触发）与 `onChange`（React 对 range 的常规映射）都接，
+             两者更新同一个预览，重复调用没有副作用。 */
+          disabled={disabled}
+          onChange={previewFromEvent}
+          onInput={previewFromEvent}
+          /* 松手 / 抬键 / 失焦才落盘：拖动中写盘会 disable 控件、原生拖拽当场中断。 */
+          onPointerUp={commitPreview}
+          onKeyUp={commitPreview}
+          onBlur={commitPreview}
         />
         {/* 档位点叠在轨道上（纯装饰，命中与吸附由原生 range 负责）。 */}
         <span
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 fd4c2e2e5..aada48538 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
@@ -1085,8 +1085,9 @@ export function registerChatComposerControlTests() {
     // 滑块不能落进 listbox 子树：参数控件混进菜单角色会让读屏进菜单模式后读不到它。
     expect(listbox.contains(slider)).toBe(false);
 
-    // 拖动 / 点档位走原生 range 的 change，落到与旧下拉同一条持久化通道与取值。
+    // 拖动 / 点档位：连续事件只改预览，松手（这里用抬键路径）才落到既有持久化通道与取值。
     fireEvent.change(slider, { target: { value: '1' } });
+    fireEvent.keyUp(slider);
     await waitFor(() => {
       expect(invoke).toHaveBeenCalledWith(
         'select_game_creator_reasoning_effort',
@@ -1129,6 +1130,58 @@ export function registerChatComposerControlTests() {
     });
   });
 
+  it('strength slider: drag follows continuously and only commits once on release', async () => {
+    let stored = 'default';
+    const { invoke, surface } = await openDirectCodexSurface({
+      select_game_creator_reasoning_effort: (args) => {
+        stored = String(args?.effort ?? '');
+        return gameCreatorConfigView(stored);
+      },
+    });
+
+    fireEvent.click(within(surface).getByRole('button', { name: '对话模型' }));
+    const slider = within(surface).getByRole('slider', {
+      name: '思维强度',
+    }) as HTMLInputElement;
+    const writes = () =>
+      invoke.mock.calls.filter(
+        ([command]) => command === 'select_game_creator_reasoning_effort',
+      ).length;
+
+    // 拖动中：连续 input 必须逐步跟手；既不能把控件 disable（原生拖拽会被中断），
+    // 也不能每格都落盘（写盘回读会把拖动中的值顶回去）。
+    // jsdom 对受控 range 的值回写与指针事件不全（不实现 PointerEvent、原生 change 不触发），
+    // 所以这里断言环境能看到的契约：控件保持可用、节点不被重挂载、拖动中不落盘；
+    // 真实的「按下 → 多步移动 → 抬起」指针序列与松手落盘在无头 Chromium 夹具里验证（见 PR 正文）。
+    for (const value of ['0', '1', '2'] as const) {
+      fireEvent.input(slider, { target: { value } });
+      expect(
+        within(surface).getAllByRole('slider'),
+        '拖动期间只应有一颗滑块',
+      ).toHaveLength(1);
+      expect(
+        within(surface).getByRole('slider', { name: '思维强度' }),
+        '滑块节点不能因 input 更新被重挂载',
+      ).toBe(slider);
+      expect(
+        slider.disabled,
+        '拖动中不应禁用滑块：禁用会中断正在进行的原生拖拽',
+      ).toBe(false);
+      expect(writes(), '拖动过程中不落盘').toBe(0);
+    }
+
+    // 松手才提交一次，取值走既有通道、与旧下拉一致（jsdom 里用抬键路径代替松手，见上）。
+    fireEvent.keyUp(slider);
+    await waitFor(() => {
+      expect(writes()).toBe(1);
+    });
+    expect(invoke).toHaveBeenCalledWith(
+      'select_game_creator_reasoning_effort',
+      { effort: 'medium' },
+    );
+    expect(stored).toBe('medium');
+  });
+
   it('shows model service unavailability as a toast and leaves no persistent line', async () => {
     const { surface } = await openDirectCodexSurface({
       load_game_creator_llm_models: () => {