feat: add copy action to AI responses

Completed AI responses now expose a bottom copy action that copies their Markdown source without reasoning, tool logs, or citation metadata. Clipboard writes use a validated Preload/Main bridge so sandboxed Electron sessions no longer fail with a renderer clipboard permission error; full-conversation copy uses the same path.

Release note: AI 回复底部现在可以直接复制 Markdown 原文，并修复了沙箱环境下回复和完整会话可能无法写入剪贴板的问题。

src/main/ipc.test.ts

@@ -242,6 +242,29 @@ describe('terminal IPC boundary', () => {
       snapshot.sessionId
     )
 
+    electronMocks.handlers.get(ipcChannels.clipboardWriteText)?.(
+      event,
+      '## Copied response'
+    )
+    expect(electronMocks.writeClipboardText).toHaveBeenCalledWith(
+      '## Copied response'
+    )
+    expect(() =>
+      electronMocks.handlers.get(ipcChannels.clipboardWriteText)?.(
+        event,
+        { text: 'invalid' }
+      )
+    ).toThrow()
+    expect(() =>
+      electronMocks.handlers.get(ipcChannels.clipboardWriteText)?.(
+        {
+          sender: { ...webContents, id: 99 },
+          senderFrame: webContents.mainFrame
+        },
+        'untrusted'
+      )
+    ).toThrow('拒绝来自未知窗口的 IPC 请求')
+
     expect(() =>
       electronMocks.handlers.get(ipcChannels.terminalWrite)?.(
         {
@@ -295,7 +318,8 @@ const electronMocks = vi.hoisted(() => {
     })),
     openPath: vi.fn(async () => ''),
     showItemInFolder: vi.fn(),
-    openExternal: vi.fn(async () => undefined)
+    openExternal: vi.fn(async () => undefined),
+    writeClipboardText: vi.fn()
   }
 })
 
@@ -1106,6 +1130,9 @@ vi.mock('electron', () => ({
     getVersion: vi.fn(() => '0.1.0')
   },
   BrowserWindow: class {},
+  clipboard: {
+    writeText: electronMocks.writeClipboardText
+  },
   dialog: {
     showOpenDialog: electronMocks.showOpenDialog,
     showSaveDialog: electronMocks.showSaveDialog

src/main/ipc.ts

@@ -1,6 +1,7 @@
 import {
   app,
   BrowserWindow,
+  clipboard,
   dialog,
   ipcMain,
   shell
@@ -31,6 +32,7 @@ import {
   browserReloadRequestSchema,
   browserStopLoadingRequestSchema,
   browserStopRequestSchema,
+  clipboardTextSchema,
   conversationQueueUserInputSchema,
   defaultRuntimeSettings,
   knowledgeCreateSchema,
@@ -3298,6 +3300,11 @@ export function registerIpcHandlers(
     }
   })
 
+  registerHandler(ipcChannels.clipboardWriteText, (event, input) => {
+    assertTrustedSender(event, window)
+    clipboard.writeText(clipboardTextSchema.parse(input))
+  })
+
   registerHandler(
     ipcChannels.appRendererPersistenceReady,
     (event) => {

src/preload/index.ts

@@ -254,6 +254,11 @@ const desktopApi: DesktopApi = {
       return () => ipcRenderer.removeListener(ipcChannels.settingsOpen, handler)
     }
   },
+  clipboard: {
+    writeText: async (text: string) => {
+      await ipcRenderer.invoke(ipcChannels.clipboardWriteText, text)
+    }
+  },
   agent: {
     getStatus: (selection) =>
       ipcRenderer.invoke(

src/preload/preload-sandbox.test.ts

@@ -21,6 +21,20 @@ describe('sandboxed preload', () => {
     expect(source).not.toMatch(/\bfrom\s+['"]zod['"]/u)
   })
 
+  it('exposes only explicit clipboard text writing', () => {
+    const source = readFileSync(
+      join(process.cwd(), 'src', 'preload', 'index.ts'),
+      'utf8'
+    )
+    const clipboard =
+      source.match(
+        /clipboard: \{(?<body>[\s\S]*?)\r?\n {2}\},\r?\n {2}agent:/u
+      )?.groups?.body ?? ''
+    expect(clipboard).toContain('writeText: async (text: string)')
+    expect(clipboard).toContain('ipcChannels.clipboardWriteText')
+    expect(clipboard).not.toMatch(/\b(?:read|image|html|rtf|bookmark)\b/iu)
+  })
+
   it('exposes only narrow browser-control methods', () => {
     const source = readFileSync(
       join(process.cwd(), 'src', 'preload', 'index.ts'),

src/renderer/src/App.test.tsx

@@ -215,6 +215,9 @@ const api: DesktopApi = {
     }),
     onOpenSettings: vi.fn(() => () => {})
   },
+  clipboard: {
+    writeText: vi.fn(async () => {})
+  },
   feedback: {
     submit: vi.fn<DesktopApi['feedback']['submit']>(async () => ({
       ok: true,
@@ -2513,11 +2516,6 @@ describe('App', () => {
   })
 
   it('keeps conversation actions in the conversation list', async () => {
-    const writeText = vi.fn(async () => {})
-    Object.defineProperty(navigator, 'clipboard', {
-      configurable: true,
-      value: { writeText }
-    })
     const { container } = render(<App />)
     const topbar = container.querySelector<HTMLElement>('.topbar')
     const conversationList =
@@ -2595,10 +2593,44 @@ describe('App', () => {
         name: '复制完整会话'
       })
     )
-    await waitFor(() => expect(writeText).toHaveBeenCalledOnce())
+    await waitFor(() =>
+      expect(api.clipboard.writeText).toHaveBeenCalledOnce()
+    )
     expect(await screen.findByRole('status')).toBeVisible()
   })
 
+  it('copies a completed assistant reply through the desktop bridge', async () => {
+    render(<App />)
+
+    fireEvent.click(
+      screen.getByRole('button', { name: '复制此回复' })
+    )
+
+    await waitFor(() =>
+      expect(api.clipboard.writeText).toHaveBeenCalledWith(
+        expect.stringContaining('你好，我是 GoodBuddy')
+      )
+    )
+    expect(
+      await screen.findByText('回复已复制到剪贴板')
+    ).toBeVisible()
+  })
+
+  it('reports a desktop clipboard write failure', async () => {
+    vi.mocked(api.clipboard.writeText).mockRejectedValueOnce(
+      new Error('clipboard unavailable')
+    )
+    render(<App />)
+
+    fireEvent.click(
+      screen.getByRole('button', { name: '复制此回复' })
+    )
+
+    expect(
+      await screen.findByRole('alert')
+    ).toHaveTextContent('无法访问剪贴板，请检查系统权限')
+  })
+
   it('flushes and opens an independent conversation branch with provenance badges', async () => {
     const sourceConversationId =
       '00000000-0000-4000-8000-000000000421'

src/renderer/src/App.tsx

@@ -857,6 +857,7 @@ function ChatHistoryPane({
   artifactById,
   conversation,
   locale,
+  onCopyMessage,
   onDownloadImage,
   onOpenCitationContext,
   onOpenCitationSource,
@@ -876,6 +877,7 @@ function ChatHistoryPane({
   artifactById: ReadonlyMap<string, AssistantArtifact>
   conversation: Conversation
   locale: TimeFormatLocale
+  onCopyMessage: (content: string) => Promise<void>
   onDownloadImage: (item: ImageViewerItem) => void
   onOpenCitationContext: (
     reference: KnowledgeSearchReference
@@ -1167,6 +1169,7 @@ function ChatHistoryPane({
               messageArticleRefs.current.delete(messageId)
             }
           }}
+          onCopyMessage={onCopyMessage}
           onDownloadImage={onDownloadImage}
           onOpenCitationContext={onOpenCitationContext}
           onOpenCitationSource={onOpenCitationSource}
@@ -6702,6 +6705,27 @@ function App(): React.JSX.Element {
     focusConversationActions(conversationId)
   }
 
+  const writeClipboardText = useCallback(
+    async (
+      content: string,
+      successMessage: string
+    ): Promise<void> => {
+      try {
+        await window.goodbuddy.clipboard.writeText(content)
+        notify({
+          tone: 'success',
+          message: successMessage
+        })
+      } catch {
+        notify({
+          tone: 'error',
+          message: t('notices.clipboardUnavailable')
+        })
+      }
+    },
+    [t]
+  )
+
   const copyConversation = async (
     conversation: ConversationSnapshot
   ): Promise<void> => {
@@ -6718,20 +6742,18 @@ function App(): React.JSX.Element {
           })
       )
       .join('\n\n')
-    try {
-      await navigator.clipboard.writeText(transcript)
-      notify({
-        tone: 'success',
-        message: t('notices.conversationCopied')
-      })
-    } catch {
-      notify({
-        tone: 'error',
-        message: t('notices.clipboardUnavailable')
-      })
-    }
+    await writeClipboardText(
+      transcript,
+      t('notices.conversationCopied')
+    )
   }
 
+  const copyMessage = useCallback(
+    (content: string): Promise<void> =>
+      writeClipboardText(content, t('notices.messageCopied')),
+    [t, writeClipboardText]
+  )
+
   const exportConversation = (
     conversation: ConversationSnapshot
   ): void => {
@@ -9195,6 +9217,7 @@ function App(): React.JSX.Element {
                     conversation={conversation}
                     key={conversation.id}
                     locale={locale}
+                    onCopyMessage={copyMessage}
                     onDownloadImage={downloadImage}
                     onOpenCitationContext={openCitationContext}
                     onOpenCitationSource={openCitationSource}

src/renderer/src/ChatTimeline.test.tsx

@@ -22,6 +22,7 @@ vi.mock('./MarkdownRenderer', () => ({
 
 const callbacks = {
   onArticleRef: vi.fn(),
+  onCopyMessage: vi.fn(async () => undefined),
   onDownloadImage: vi.fn(),
   onOpenCitationContext: vi.fn(async () => undefined),
   onOpenCitationSource: vi.fn(async () => undefined),
@@ -195,6 +196,63 @@ describe('ChatTimeline', () => {
     ).toHaveTextContent('每日状态')
   })
 
+  it('copies a completed assistant reply from its bottom action', () => {
+    const messages: Message[] = [
+      {
+        id: 'assistant-message',
+        role: 'assistant',
+        content: '## Answer\n\nKeep the Markdown source.',
+        reasoning: 'private reasoning',
+        createdAt: 1_775_000_000_000,
+        state: 'complete'
+      },
+      {
+        id: 'streaming-message',
+        role: 'assistant',
+        content: 'Partial answer',
+        createdAt: 1_775_000_001_000,
+        state: 'streaming'
+      },
+      {
+        id: 'user-message',
+        role: 'user',
+        content: 'User content',
+        createdAt: 1_775_000_002_000,
+        state: 'complete'
+      }
+    ]
+
+    render(
+      <ChatTimeline
+        artifactById={new Map()}
+        conversationId="conversation-1"
+        hiddenMessageCount={0}
+        isUnusedConversation={false}
+        locale="zh-CN"
+        messageStartIndex={0}
+        messages={messages}
+        {...callbacks}
+        retryContent=""
+        totalMessageCount={messages.length}
+      />
+    )
+
+    const copyButton = screen.getByRole('button', {
+      name: '复制此回复'
+    })
+    expect(copyButton).toHaveAttribute('title', '复制此回复')
+    expect(
+      screen.getAllByRole('button', { name: '复制此回复' })
+    ).toHaveLength(1)
+
+    fireEvent.click(copyButton)
+
+    expect(callbacks.onCopyMessage).toHaveBeenCalledOnce()
+    expect(callbacks.onCopyMessage).toHaveBeenCalledWith(
+      '## Answer\n\nKeep the Markdown source.'
+    )
+  })
+
   it('shows every parallel expert output in its own expandable card', () => {
     const messages: Message[] = [
       {

src/renderer/src/ChatTimeline.tsx

@@ -3,6 +3,7 @@ import {
   CheckCircle2,
   ChevronRight,
   Clock3,
+  Copy,
   Download,
   FileText,
   Library,
@@ -382,6 +383,7 @@ type ChatMessageRowProps = {
   locale: TimeFormatLocale
   message: Message
   onArticleRef: (messageId: string, element: HTMLElement | null) => void
+  onCopyMessage: (content: string) => Promise<void>
   onDownloadImage: (item: ImageViewerItem) => void
   onOpenCitationContext: (
     reference: KnowledgeSearchReference
@@ -414,6 +416,7 @@ function ChatMessageRowView({
   locale,
   message,
   onArticleRef,
+  onCopyMessage,
   onDownloadImage,
   onOpenCitationContext,
   onOpenCitationSource,
@@ -986,6 +989,27 @@ function ChatMessageRowView({
             {t('chat.retry')}
           </button>
         )}
+        {message.role === 'assistant' &&
+          message.state !== 'streaming' &&
+          Boolean(message.content.trim()) && (
+            <div className="message__actions">
+              <button
+                aria-label={t('chat.copyMessage')}
+                className="icon-button"
+                onClick={() =>
+                  void onCopyMessage(
+                    greeting
+                      ? t('conversation.greeting')
+                      : message.content
+                  )
+                }
+                title={t('chat.copyMessage')}
+                type="button"
+              >
+                <Copy aria-hidden="true" size={15} />
+              </button>
+            </div>
+          )}
       </div>
     </article>
       {message.role === 'assistant' &&
@@ -1028,6 +1052,7 @@ type ChatTimelineProps = {
   messageStartIndex: number
   messages: Message[]
   onArticleRef: (messageId: string, element: HTMLElement | null) => void
+  onCopyMessage: (content: string) => Promise<void>
   onDownloadImage: (item: ImageViewerItem) => void
   onOpenCitationContext: (
     reference: KnowledgeSearchReference
@@ -1063,6 +1088,7 @@ export function ChatTimeline({
   messageStartIndex,
   messages,
   onArticleRef,
+  onCopyMessage,
   onDownloadImage,
   onOpenCitationContext,
   onOpenCitationSource,
@@ -1104,6 +1130,7 @@ export function ChatTimeline({
             locale={locale}
             message={message}
             onArticleRef={onArticleRef}
+            onCopyMessage={onCopyMessage}
             onDownloadImage={onDownloadImage}
             onOpenCitationContext={onOpenCitationContext}
             onOpenCitationSource={onOpenCitationSource}

src/renderer/src/i18n/locales/en-US/app.ts

@@ -331,6 +331,7 @@ export const app = {
       }
     },
     retry: 'Edit and send again',
+    copyMessage: 'Copy this response',
     loadEarlierMessages: 'Load earlier messages ({{count}} remaining)',
     scrollToBottom: 'Scroll to bottom',
     status: {
@@ -615,6 +616,7 @@ export const app = {
     deletedConversationBrowserCloseFailed:
       'Failed to close the browser for the deleted conversation',
     conversationCopied: 'Conversation copied to the clipboard',
+    messageCopied: 'Response copied to the clipboard',
     clipboardUnavailable:
       'Cannot access the clipboard. Check your system permissions.',
     conversationExported: 'Conversation exported',

src/renderer/src/i18n/locales/zh-CN/app.ts

@@ -314,6 +314,7 @@ export const app = {
       }
     },
     retry: '重新编辑并发送',
+    copyMessage: '复制此回复',
     loadEarlierMessages: '加载更早的消息（还剩 {{count}} 条）',
     scrollToBottom: '到底部',
     status: {
@@ -572,6 +573,7 @@ export const app = {
       '删除本地会话失败，已保留当前对话',
     deletedConversationBrowserCloseFailed: '关闭已删除对话的浏览器失败',
     conversationCopied: '对话已复制到剪贴板',
+    messageCopied: '回复已复制到剪贴板',
     clipboardUnavailable: '无法访问剪贴板，请检查系统权限',
     conversationExported: '对话已导出',
     conversationBranched: '已创建并打开分支会话',

src/renderer/src/styles.css

@@ -5363,6 +5363,11 @@ button > svg {
   justify-content: flex-end;
 }
 
+.message__actions {
+  display: flex;
+  margin-top: var(--space-2);
+}
+
 .message-attachments {
   display: flex;
   max-width: 100%;

src/shared/contracts.test.ts

@@ -5,10 +5,23 @@ import {
   browserNavigateRequestSchema,
   browserStopLoadingRequestSchema,
   builtinEmbeddingConnectionId,
+  clipboardTextSchema,
   legacyEmbeddingConnectionId,
   runtimeSettingsInputSchema
 } from './contracts'
 
+describe('clipboard text contract', () => {
+  it('accepts text and rejects non-text input', () => {
+    expect(clipboardTextSchema.parse('Markdown response')).toBe(
+      'Markdown response'
+    )
+    expect(clipboardTextSchema.parse('')).toBe('')
+    expect(clipboardTextSchema.safeParse({ text: 'no' }).success).toBe(
+      false
+    )
+  })
+})
+
 describe('browser control contracts', () => {
   it('requires authoritative toolbar metadata and accepts committed URLs up to 8192 characters', () => {
     const base = {

src/shared/contracts.ts

@@ -1116,6 +1116,8 @@ export type ContextFileSelectionProgress = {
 
 export const maximumPastedImageBytes = 12 * 1024 * 1024
 
+export const clipboardTextSchema = z.string()
+
 export const pastedImageInputSchema = z
   .object({
     data: z
@@ -1561,6 +1563,9 @@ export type DesktopApi = {
     onNewConversation: (listener: () => void) => () => void
     onOpenSettings: (listener: () => void) => () => void
   }
+  clipboard: {
+    writeText: (text: string) => Promise<void>
+  }
   agent: {
     getStatus: (
       selection?: AgentRuntimeSelection

src/shared/ipc-channels.ts

@@ -11,6 +11,7 @@ export const ipcChannels = {
   appRendererPersistenceRequest: 'app:renderer-persistence-request',
   appRendererPersistenceComplete: 'app:renderer-persistence-complete',
   appClearLocalData: 'app:clear-local-data',
+  clipboardWriteText: 'clipboard:write-text',
   conversationNew: 'conversation:new',
   settingsOpen: 'settings:open',
   agentStatus: 'agent:get-status',