diff --git a/desktop/src/components/chat/AssistantMessage.linkrouting.test.tsx b/desktop/src/components/chat/AssistantMessage.linkrouting.test.tsx
new file mode 100644
index 00000000..3a7a00af
--- /dev/null
+++ b/desktop/src/components/chat/AssistantMessage.linkrouting.test.tsx
@@ -0,0 +1,24 @@
+import '@testing-library/jest-dom'
+import { fireEvent, render, screen } from '@testing-library/react'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+
+const { openBrowser } = vi.hoisted(() => ({ openBrowser: vi.fn() }))
+vi.mock('../../stores/browserPanelStore', () => ({
+  useBrowserPanelStore: { getState: () => ({ open: openBrowser }) },
+}))
+vi.mock('../../lib/desktopRuntime', async (orig) => ({
+  ...(await orig<Record<string, unknown>>()),
+  getServerBaseUrl: () => 'http://127.0.0.1:4321',
+}))
+
+import { AssistantMessage } from './AssistantMessage'
+
+afterEach(() => openBrowser.mockReset())
+
+describe('AssistantMessage link routing', () => {
+  it('opens a localhost link in the in-app browser', () => {
+    render(<AssistantMessage sessionId="s1" content={'打开 [预览](http://localhost:5173/)'} />)
+    fireEvent.click(screen.getByText('预览'))
+    expect(openBrowser).toHaveBeenCalledWith('s1', 'http://localhost:5173/')
+  })
+})
diff --git a/desktop/src/components/chat/AssistantMessage.tsx b/desktop/src/components/chat/AssistantMessage.tsx
index 7f254788..3a8d057a 100644
--- a/desktop/src/components/chat/AssistantMessage.tsx
+++ b/desktop/src/components/chat/AssistantMessage.tsx
@@ -1,15 +1,43 @@
-import { memo } from 'react'
+import { memo, useCallback } from 'react'
+import type { MouseEvent as ReactMouseEvent } from 'react'
 import { MarkdownRenderer } from '../markdown/MarkdownRenderer'
 import { MessageActionBar, type MessageBranchAction } from './MessageActionBar'
 import { InlineImageGallery } from './InlineImageGallery'
+import { handlePreviewLink } from '../../lib/handlePreviewLink'
+import { getServerBaseUrl } from '../../lib/desktopRuntime'
+import { useBrowserPanelStore } from '../../stores/browserPanelStore'
+import { useWorkspacePanelStore } from '../../stores/workspacePanelStore'
 
 type Props = {
   content: string
   isStreaming?: boolean
   branchAction?: MessageBranchAction
+  sessionId?: string
 }
 
-export const AssistantMessage = memo(function AssistantMessage({ content, isStreaming, branchAction }: Props) {
+export const AssistantMessage = memo(function AssistantMessage({ content, isStreaming, branchAction, sessionId }: Props) {
+  const handleLinkClick = useCallback(
+    (href: string, event: ReactMouseEvent<HTMLDivElement>): boolean => {
+      if (!sessionId) return false
+      const handled = handlePreviewLink(href, {
+        sessionId,
+        serverBaseUrl: getServerBaseUrl(),
+        openBrowser: (id, url) => useBrowserPanelStore.getState().open(id, url),
+        openFilePreview: (id, path) => {
+          void useWorkspacePanelStore.getState().openPreview(id, path, 'file')
+        },
+        openExternal: (url) => {
+          void import('@tauri-apps/plugin-shell')
+            .then((m) => m.open(url))
+            .catch(() => window.open(url, '_blank'))
+        },
+      })
+      if (handled) event.preventDefault()
+      return handled
+    },
+    [sessionId],
+  )
+
   if (!content.trim()) return null
 
   const documentLayout = shouldUseDocumentLayout(content)
@@ -32,6 +60,7 @@ export const AssistantMessage = memo(function AssistantMessage({ content, isStre
             content={content}
             variant={documentLayout ? 'document' : 'default'}
             streaming={isStreaming}
+            onLinkClick={sessionId ? handleLinkClick : undefined}
           />
           {!isStreaming && <InlineImageGallery text={content} />}
           {isStreaming && (
diff --git a/desktop/src/components/chat/MessageList.tsx b/desktop/src/components/chat/MessageList.tsx
index 4c20bcc6..9d1efe71 100644
--- a/desktop/src/components/chat/MessageList.tsx
+++ b/desktop/src/components/chat/MessageList.tsx
@@ -1960,7 +1960,7 @@ export const MessageBlock = memo(function MessageBlock({
           role="assistant"
           content={message.content}
         >
-          <AssistantMessage content={message.content} branchAction={branchAction} />
+          <AssistantMessage content={message.content} branchAction={branchAction} sessionId={sessionId ?? undefined} />
         </SelectableChatMessage>
       )
     case 'thinking':
diff --git a/desktop/src/lib/desktopRuntime.ts b/desktop/src/lib/desktopRuntime.ts
index f39ff09b..bafa0298 100644
--- a/desktop/src/lib/desktopRuntime.ts
+++ b/desktop/src/lib/desktopRuntime.ts
@@ -1,5 +1,6 @@
 import {
   api,
+  getBaseUrl,
   getDefaultBaseUrl,
   hasExplicitDefaultBaseUrl,
   setAuthToken,
@@ -41,6 +42,19 @@ export function isBrowserH5Runtime() {
   return typeof window !== 'undefined' && !isTauriRuntime()
 }
 
+/**
+ * Synchronously return the running local server's base URL (e.g.
+ * `http://127.0.0.1:<port>`).
+ *
+ * The api client caches the resolved base after startup: `initializeDesktopServerUrl`
+ * calls `invoke('get_server_url')` (desktop) or resolves a browser/H5 URL, then
+ * `setBaseUrl(...)`. Until that runs, `getBaseUrl()` returns the default
+ * (`http://127.0.0.1:3456` or `VITE_DESKTOP_SERVER_URL`).
+ */
+export function getServerBaseUrl(): string {
+  return getBaseUrl()
+}
+
 export function readStoredH5Connection(): StoredH5Connection {
   if (typeof window === 'undefined') {
     return { serverUrl: null, token: null }