diff --git a/UI-DESIGN.md b/UI-DESIGN.md
index 05a6fef8..3ba08d9e 100644
--- a/UI-DESIGN.md
+++ b/UI-DESIGN.md
@@ -613,6 +613,7 @@ GoodBuddy 是可调整窗口大小的桌面应用。响应式设计优先保证
 
 - “笔记 / 待办”属于同一工作台内的同级内容面板，使用 `PageTabs` 的 `segmented` 视觉变体，与模型设置的分段控件保持同一外观。
 - 页签切换保留 `tablist`、`tab` 和 `tabpanel` 语义；待办状态仍使用独立的 `SegmentedControl`，不得与内容页签合并。
+- 在待办面板勾选或取消勾选后，当前缓存中的源笔记正文必须立即同步对应清单状态，不得依赖离开工作区后重新加载。
 - 当前记录草稿非空时，切换笔记、待办或内容面板必须先在编辑器旁就地确认；继续编辑时保留草稿并恢复编辑焦点，只有明确选择放弃后才切换。
 - 创建、保存、更新、删除和 AI 评论完成等短期结果进入应用级通知，不在编辑区或列表上方堆放页内通知。
 - 标题或正文校验、删除确认、同步进度和可就地恢复的错误仍靠近对应编辑器或操作呈现。
diff --git a/src/main/ipc.ts b/src/main/ipc.ts
index b69b4270..58728341 100644
--- a/src/main/ipc.ts
+++ b/src/main/ipc.ts
@@ -5686,9 +5686,13 @@ export function registerIpcHandlers(
     ipcChannels.magicTodosUpdate,
     (event, input: unknown) => {
       assertTrustedSender(event, window)
-      return assistantDatabase.updateMagicTodo(
+      const todo = assistantDatabase.updateMagicTodo(
         magicTodoUpdateSchema.parse(input)
       )
+      return {
+        todo,
+        note: assistantDatabase.getMagicNote(todo.noteId)
+      }
     }
   )
 
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 08e21ed0..6284b655 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -107,6 +107,7 @@ import type {
   MagicNoteDetail,
   MagicNotesSnapshot,
   MagicTodoItem,
+  MagicTodoUpdateResult,
   MagicTodosSnapshot
 } from '../shared/magic-notes-contracts'
 import type {
@@ -1113,7 +1114,7 @@ const desktopApi: DesktopApi = {
       ipcRenderer.invoke(
         ipcChannels.magicTodosUpdate,
         input
-      ) as Promise<MagicTodoItem>,
+      ) as Promise<MagicTodoUpdateResult>,
     analyzeTodo: (todoId, options) =>
       ipcRenderer.invoke(ipcChannels.magicTodosAnalyze, {
         todoId,
diff --git a/src/renderer/src/MagicNotesWorkspace.test.tsx b/src/renderer/src/MagicNotesWorkspace.test.tsx
index 1c4fc312..dedca8e8 100644
--- a/src/renderer/src/MagicNotesWorkspace.test.tsx
+++ b/src/renderer/src/MagicNotesWorkspace.test.tsx
@@ -14,7 +14,9 @@ import type { ApplicationSettings } from '../../shared/application-settings-cont
 import type {
   MagicNoteDetail,
   MagicNotesSnapshot,
+  MagicNoteRichContent,
   MagicTodoItem,
+  MagicTodoUpdateResult,
   MagicTodosSnapshot
 } from '../../shared/magic-notes-contracts'
 import { MagicNotesWorkspace } from './MagicNotesWorkspace'
@@ -47,7 +49,22 @@ vi.mock('./MagicNoteEditor', () => ({
 }))
 
 vi.mock('./MagicNoteContent', () => ({
-  MagicNoteContent: () => <div>记录正文</div>
+  MagicNoteContent: ({ content }: { content: MagicNoteRichContent }) => {
+    const checklistState =
+      content.ops.find(
+        (operation) =>
+          operation.attributes?.list === 'checked' ||
+          operation.attributes?.list === 'unchecked'
+      )?.attributes?.list ?? 'none'
+    return (
+      <div>
+        <span>记录正文</span>
+        <output data-testid="magic-note-checklist-state">
+          {checklistState}
+        </output>
+      </div>
+    )
+  }
 }))
 
 const noteId = '00000000-0000-4000-8000-000000000601'
@@ -229,11 +246,41 @@ beforeEach(() => {
       revision: entry.revision + 1
     }))
   })
-  updateTodo.mockImplementation(async (input) => ({
-    ...noteTodo,
-    completed: input.completed,
-    revision: noteTodo.revision + 1
-  }))
+  updateTodo.mockImplementation(
+    async (input): Promise<MagicTodoUpdateResult> => ({
+      todo: {
+        ...noteTodo,
+        completed: input.completed,
+        revision: input.expectedRevision + 1
+      },
+      note: {
+        ...detail,
+        revision: detail.revision + 1,
+        entries: detail.entries.map((entry) =>
+          entry.id === noteTodo.entryId
+            ? {
+                ...entry,
+                content: {
+                  version: 1,
+                  ops: [
+                    { insert: noteTodo.title },
+                    {
+                      insert: '\n',
+                      attributes: {
+                        list: input.completed ? 'checked' : 'unchecked'
+                      }
+                    }
+                  ]
+                },
+                comments: [],
+                analyzedAt: undefined,
+                revision: entry.revision + 1
+              }
+            : entry
+        )
+      }
+    })
+  )
   analyze.mockResolvedValue({
     ...createdDetail,
     entries: createdDetail.entries.map((entry) =>
@@ -957,7 +1004,7 @@ describe('MagicNotesWorkspace', () => {
     expect(screen.getByText('准备演示')).toBeInTheDocument()
   })
 
-  it('marks a todo completed from the standalone todo tab', async () => {
+  it('synchronizes todo completion with its source note immediately', async () => {
     render(<MagicNotesWorkspace onNotify={onNotify} />)
 
     await screen.findByText('记录正文')
@@ -986,6 +1033,30 @@ describe('MagicNotesWorkspace', () => {
         message: '待办已完成'
       })
     )
+
+    fireEvent.click(screen.getByRole('tab', { name: '笔记' }))
+    expect(
+      screen.getByTestId('magic-note-checklist-state')
+    ).toHaveTextContent('checked')
+
+    fireEvent.click(screen.getByRole('tab', { name: '待办' }))
+    fireEvent.click(
+      screen.getByRole('button', {
+        name: `标记为未完成：${noteTodo.title}`
+      })
+    )
+    await waitFor(() =>
+      expect(updateTodo).toHaveBeenNthCalledWith(2, {
+        todoId: noteTodo.id,
+        completed: false,
+        expectedRevision: noteTodo.revision + 1
+      })
+    )
+
+    fireEvent.click(screen.getByRole('tab', { name: '笔记' }))
+    expect(
+      screen.getByTestId('magic-note-checklist-state')
+    ).toHaveTextContent('unchecked')
   })
 
   it('reuses the AI comments pane for selected todos', async () => {
diff --git a/src/renderer/src/MagicNotesWorkspace.tsx b/src/renderer/src/MagicNotesWorkspace.tsx
index d9130336..b93f5244 100644
--- a/src/renderer/src/MagicNotesWorkspace.tsx
+++ b/src/renderer/src/MagicNotesWorkspace.tsx
@@ -693,9 +693,7 @@ export function MagicNotesWorkspace({
     []
   )
 
-  const applyDetail = useCallback((next: MagicNoteDetail) => {
-    setDetail(next)
-    setTitleDraft(next.title)
+  const applyNoteSummary = useCallback((next: MagicNoteDetail) => {
     setNotes((current) => {
       const summary = noteSummary(next)
       const existing = current.some((note) => note.id === next.id)
@@ -710,6 +708,15 @@ export function MagicNotesWorkspace({
     })
   }, [])
 
+  const applyDetail = useCallback(
+    (next: MagicNoteDetail) => {
+      setDetail(next)
+      setTitleDraft(next.title)
+      applyNoteSummary(next)
+    },
+    [applyNoteSummary]
+  )
+
   const applyTodo = useCallback((next: MagicTodoItem) => {
     setTodos((current) =>
       [
@@ -1184,13 +1191,17 @@ export function MagicNotesWorkspace({
     }
     try {
       const completed = !todo.completed
-      applyTodo(
-        await window.goodbuddy.magicNotes.updateTodo({
-          todoId: todo.id,
-          completed,
-          expectedRevision: todo.revision
-        })
-      )
+      const result = await window.goodbuddy.magicNotes.updateTodo({
+        todoId: todo.id,
+        completed,
+        expectedRevision: todo.revision
+      })
+      applyTodo(result.todo)
+      if (requestedNoteIdRef.current === result.note.id) {
+        applyDetail(result.note)
+      } else {
+        applyNoteSummary(result.note)
+      }
       notifySuccess(
         t(
           completed
diff --git a/src/shared/contracts.ts b/src/shared/contracts.ts
index 085a51bd..fff66f95 100644
--- a/src/shared/contracts.ts
+++ b/src/shared/contracts.ts
@@ -64,6 +64,7 @@ import type {
   MagicNoteUpdateInput,
   MagicTodoItem,
   MagicTodoUpdateInput,
+  MagicTodoUpdateResult,
   MagicTodosSnapshot
 } from './magic-notes-contracts'
 import type {
@@ -1704,7 +1705,7 @@ export type DesktopApi = {
     listTodos: () => Promise<MagicTodosSnapshot>
     updateTodo: (
       input: MagicTodoUpdateInput
-    ) => Promise<MagicTodoItem>
+    ) => Promise<MagicTodoUpdateResult>
     analyzeTodo: (
       todoId: string,
       options: MagicNoteAnalysisOptions
diff --git a/src/shared/magic-notes-contracts.ts b/src/shared/magic-notes-contracts.ts
index 6d5d971a..f8186969 100644
--- a/src/shared/magic-notes-contracts.ts
+++ b/src/shared/magic-notes-contracts.ts
@@ -433,6 +433,11 @@ export type MagicTodoItem = {
   updatedAt: string
 }
 
+export type MagicTodoUpdateResult = {
+  todo: MagicTodoItem
+  note: MagicNoteDetail
+}
+
 export type MagicTodosSnapshot = {
   todos: MagicTodoItem[]
 }