diff --git a/desktop/src/components/layout/StartupErrorView.test.tsx b/desktop/src/components/layout/StartupErrorView.test.tsx
index 757a63c2..007e4bde 100644
--- a/desktop/src/components/layout/StartupErrorView.test.tsx
+++ b/desktop/src/components/layout/StartupErrorView.test.tsx
@@ -19,28 +19,47 @@ describe('splitStartupError', () => {
 })
 
 describe('StartupErrorView', () => {
-  it('shows diagnostics and copies the full payload', async () => {
-    const writeText = vi.fn().mockResolvedValue(undefined)
+  it('shows diagnostics and copies the full payload with the legacy fallback', async () => {
+    const originalClipboard = navigator.clipboard
+    const originalExecCommand = document.execCommand
+    Object.defineProperty(document, 'execCommand', {
+      configurable: true,
+      value: vi.fn().mockReturnValue(true),
+    })
+    const execCommand = vi.mocked(document.execCommand)
+    const writeText = vi.fn().mockRejectedValue(new Error('clipboard blocked'))
     Object.defineProperty(navigator, 'clipboard', {
       value: { writeText },
       configurable: true,
     })
 
-    render(
-      <StartupErrorView error={'startup failed\n\nRecent server logs:\n[stderr] boom'} />,
-    )
+    try {
+      render(
+        <StartupErrorView error={'startup failed\n\nRecent server logs:\n[stderr] boom'} />,
+      )
 
-    expect(screen.getByText('本地服务启动失败')).toBeInTheDocument()
-    expect(screen.getByText('startup failed')).toBeInTheDocument()
-    expect(screen.getByText('[stderr] boom')).toBeInTheDocument()
+      expect(screen.getByText('本地服务启动失败')).toBeInTheDocument()
+      expect(screen.getByText('startup failed')).toBeInTheDocument()
+      expect(screen.getByText('[stderr] boom')).toBeInTheDocument()
 
-    fireEvent.click(screen.getByRole('button', { name: '复制诊断信息' }))
+      fireEvent.click(screen.getByRole('button', { name: '复制诊断信息' }))
 
-    await waitFor(() => {
+      await waitFor(() => {
+        expect(execCommand).toHaveBeenCalledWith('copy')
+      })
       expect(writeText).toHaveBeenCalledWith(
         'startup failed\n\nRecent server logs:\n[stderr] boom',
       )
-    })
-    expect(screen.getByText('已复制')).toBeInTheDocument()
+      expect(screen.getByText('已复制')).toBeInTheDocument()
+    } finally {
+      Object.defineProperty(document, 'execCommand', {
+        configurable: true,
+        value: originalExecCommand,
+      })
+      Object.defineProperty(navigator, 'clipboard', {
+        configurable: true,
+        value: originalClipboard,
+      })
+    }
   })
 })
diff --git a/desktop/src/components/layout/StartupErrorView.tsx b/desktop/src/components/layout/StartupErrorView.tsx
index 88a820ea..134cf4ee 100644
--- a/desktop/src/components/layout/StartupErrorView.tsx
+++ b/desktop/src/components/layout/StartupErrorView.tsx
@@ -3,6 +3,7 @@ import { useMemo, useState } from 'react'
 import { useTranslation } from '../../i18n'
 import { Button } from '../shared/Button'
 import { DoctorPanel } from '../doctor/DoctorPanel'
+import { copyTextToClipboard } from '../chat/clipboard'
 
 const LOG_MARKER = '\n\nRecent server logs:\n'
 
@@ -35,7 +36,9 @@ export function StartupErrorView({ error }: StartupErrorViewProps) {
   const [copied, setCopied] = useState(false)
 
   const handleCopy = async () => {
-    await navigator.clipboard?.writeText(diagnostics)
+    const ok = await copyTextToClipboard(diagnostics)
+    if (!ok) return
+
     setCopied(true)
     window.setTimeout(() => setCopied(false), 1600)
   }
diff --git a/desktop/src/components/markdown/MarkdownRenderer.test.tsx b/desktop/src/components/markdown/MarkdownRenderer.test.tsx
index b47bd5b8..4692a7ff 100644
--- a/desktop/src/components/markdown/MarkdownRenderer.test.tsx
+++ b/desktop/src/components/markdown/MarkdownRenderer.test.tsx
@@ -1,5 +1,5 @@
 import { describe, it, expect, vi } from 'vitest'
-import { render, screen } from '@testing-library/react'
+import { fireEvent, render, screen, waitFor } from '@testing-library/react'
 import '@testing-library/jest-dom'
 
 vi.mock('../chat/CodeViewer', () => ({
@@ -126,4 +126,42 @@ describe('MarkdownRenderer', () => {
     expect(link).toHaveAttribute('target', '_blank')
     expect(link).toHaveAttribute('rel', expect.stringContaining('noopener'))
   })
+
+  it('copies enhanced markdown button text with the legacy clipboard fallback', async () => {
+    const originalClipboard = navigator.clipboard
+    const originalExecCommand = document.execCommand
+    Object.defineProperty(document, 'execCommand', {
+      configurable: true,
+      value: vi.fn().mockReturnValue(true),
+    })
+    const execCommand = vi.mocked(document.execCommand)
+    Object.defineProperty(navigator, 'clipboard', {
+      configurable: true,
+      value: {
+        writeText: vi.fn().mockRejectedValue(new Error('clipboard blocked')),
+      },
+    })
+    const writeText = vi.mocked(navigator.clipboard.writeText)
+
+    try {
+      render(<MarkdownRenderer content={'<button data-copy-code="npm run verify">Copy</button>'} />)
+
+      fireEvent.click(screen.getByRole('button', { name: 'Copy' }))
+
+      await waitFor(() => {
+        expect(execCommand).toHaveBeenCalledWith('copy')
+      })
+      expect(writeText).toHaveBeenCalledWith('npm run verify')
+      expect(screen.getByRole('button', { name: 'Copied' })).toBeInTheDocument()
+    } finally {
+      Object.defineProperty(document, 'execCommand', {
+        configurable: true,
+        value: originalExecCommand,
+      })
+      Object.defineProperty(navigator, 'clipboard', {
+        configurable: true,
+        value: originalClipboard,
+      })
+    }
+  })
 })
diff --git a/desktop/src/components/markdown/MarkdownRenderer.tsx b/desktop/src/components/markdown/MarkdownRenderer.tsx
index f710de05..eac69a50 100644
--- a/desktop/src/components/markdown/MarkdownRenderer.tsx
+++ b/desktop/src/components/markdown/MarkdownRenderer.tsx
@@ -3,6 +3,7 @@ import DOMPurify from 'dompurify'
 import { marked, type Tokens } from 'marked'
 import { CodeViewer } from '../chat/CodeViewer'
 import { MermaidRenderer } from '../chat/MermaidRenderer'
+import { copyTextToClipboard } from '../chat/clipboard'
 
 type Props = {
   content: string
@@ -201,16 +202,14 @@ export function MarkdownRenderer({ content, variant = 'default', className }: Pr
     const text = button.getAttribute('data-copy-code')
     if (!text) return
 
-    try {
-      await navigator.clipboard.writeText(text)
-      const original = button.textContent
-      button.textContent = 'Copied'
-      window.setTimeout(() => {
-        button.textContent = original
-      }, 1500)
-    } catch {
-      // Ignore clipboard errors
-    }
+    const copied = await copyTextToClipboard(text)
+    if (!copied) return
+
+    const original = button.textContent
+    button.textContent = 'Copied'
+    window.setTimeout(() => {
+      button.textContent = original
+    }, 1500)
   }, [])
 
   if (codeBlocks.length === 0) {
diff --git a/desktop/src/components/workspace/WorkspacePanel.test.tsx b/desktop/src/components/workspace/WorkspacePanel.test.tsx
index a0873feb..5063b41b 100644
--- a/desktop/src/components/workspace/WorkspacePanel.test.tsx
+++ b/desktop/src/components/workspace/WorkspacePanel.test.tsx
@@ -1194,6 +1194,82 @@ describe('WorkspacePanel', () => {
     ])
   })
 
+  it('copies file paths from the file tree menu with the legacy clipboard fallback', async () => {
+    const originalClipboard = navigator.clipboard
+    const originalExecCommand = document.execCommand
+    Object.defineProperty(document, 'execCommand', {
+      configurable: true,
+      value: vi.fn().mockReturnValue(true),
+    })
+    const execCommand = vi.mocked(document.execCommand)
+    Object.defineProperty(navigator, 'clipboard', {
+      configurable: true,
+      value: {
+        writeText: vi.fn().mockRejectedValue(new Error('clipboard blocked')),
+      },
+    })
+    const writeText = vi.mocked(navigator.clipboard.writeText)
+
+    try {
+      await setWorkspaceState((state) => ({
+        ...state,
+        panelBySession: {
+          ...state.panelBySession,
+          'session-copy-file': {
+            isOpen: true,
+            activeView: 'all',
+          },
+        },
+        statusBySession: {
+          ...state.statusBySession,
+          'session-copy-file': {
+            state: 'ok',
+            workDir: '/repo',
+            repoName: 'repo',
+            branch: 'main',
+            isGitRepo: true,
+            changedFiles: [],
+          },
+        },
+        treeBySessionPath: {
+          ...state.treeBySessionPath,
+          'session-copy-file': {
+            '': {
+              state: 'ok',
+              path: '',
+              entries: [{ name: 'App.tsx', path: 'src/App.tsx', isDirectory: false }],
+            },
+          },
+        },
+      }))
+
+      const view = await renderPanel('session-copy-file')
+
+      await act(() => {
+        fireEvent.contextMenu(view.getByRole('button', { name: /App\.tsx/i }), {
+          clientX: 260,
+          clientY: 80,
+        })
+      })
+
+      await clickElement(view.getByRole('menuitem', { name: 'Copy path' }))
+
+      await waitFor(() => {
+        expect(execCommand).toHaveBeenCalledWith('copy')
+      })
+      expect(writeText).toHaveBeenCalledWith('/repo/src/App.tsx')
+    } finally {
+      Object.defineProperty(document, 'execCommand', {
+        configurable: true,
+        value: originalExecCommand,
+      })
+      Object.defineProperty(navigator, 'clipboard', {
+        configurable: true,
+        value: originalClipboard,
+      })
+    }
+  })
+
   it('adds a line comment from a code preview to the chat context', async () => {
     await setWorkspaceState((state) => ({
       ...state,
diff --git a/desktop/src/components/workspace/WorkspacePanel.tsx b/desktop/src/components/workspace/WorkspacePanel.tsx
index ada3f69e..020e3bdd 100644
--- a/desktop/src/components/workspace/WorkspacePanel.tsx
+++ b/desktop/src/components/workspace/WorkspacePanel.tsx
@@ -16,6 +16,7 @@ import {
 } from '../../stores/workspacePanelStore'
 import { useChatStore } from '../../stores/chatStore'
 import { useWorkspaceChatContextStore } from '../../stores/workspaceChatContextStore'
+import { copyTextToClipboard } from '../chat/clipboard'
 import { MarkdownRenderer } from '../markdown/MarkdownRenderer'
 import {
   getFileExtension,
@@ -1066,9 +1067,9 @@ export function WorkspacePanel({ sessionId }: WorkspacePanelProps) {
     setPreviewTabContextMenu(null)
   }
 
-  const copyWorkspacePath = (path: string) => {
+  const copyWorkspacePath = async (path: string) => {
     const resolvedPath = resolveWorkspaceAttachmentPath(status?.workDir, path)
-    void navigator.clipboard?.writeText(resolvedPath)
+    await copyTextToClipboard(resolvedPath)
     setFileContextMenu(null)
   }
 
@@ -1460,7 +1461,7 @@ export function WorkspacePanel({ sessionId }: WorkspacePanelProps) {
           <button
             type="button"
             role="menuitem"
-            onClick={() => copyWorkspacePath(fileContextMenu.path)}
+            onClick={() => void copyWorkspacePath(fileContextMenu.path)}
             className="flex w-full items-center gap-2 px-3 py-1.5 text-left text-[var(--color-text-primary)] hover:bg-[var(--color-surface-hover)]"
           >
             <span aria-hidden="true" className="material-symbols-outlined text-[14px] text-[var(--color-text-tertiary)]">content_copy</span>