diff --git a/apps/electron/src/main/ipc.ts b/apps/electron/src/main/ipc.ts
index 1073e2f..c0a4cb2 100644
--- a/apps/electron/src/main/ipc.ts
+++ b/apps/electron/src/main/ipc.ts
@@ -567,6 +567,17 @@ export function registerIpcHandlers(): void {
     }
   )
 
+  // 切换 Agent 会话置顶状态
+  ipcMain.handle(
+    AGENT_IPC_CHANNELS.TOGGLE_PIN,
+    async (_, id: string): Promise<AgentSessionMeta> => {
+      const sessions = listAgentSessions()
+      const current = sessions.find((s) => s.id === id)
+      if (!current) throw new Error(`Agent 会话不存在: ${id}`)
+      return updateAgentSessionMeta(id, { pinned: !current.pinned })
+    }
+  )
+
   // ===== Agent 工作区管理相关 =====
 
   // 确保默认工作区存在
diff --git a/apps/electron/src/main/lib/agent-session-manager.ts b/apps/electron/src/main/lib/agent-session-manager.ts
index 563e374..5e05e2d 100644
--- a/apps/electron/src/main/lib/agent-session-manager.ts
+++ b/apps/electron/src/main/lib/agent-session-manager.ts
@@ -66,11 +66,17 @@ function writeIndex(index: AgentSessionsIndex): void {
 }
 
 /**
- * 获取所有会话（按 updatedAt 降序）
+ * 获取所有会话（置顶项优先，然后按 updatedAt 降序）
  */
 export function listAgentSessions(): AgentSessionMeta[] {
   const index = readIndex()
-  return index.sessions.sort((a, b) => b.updatedAt - a.updatedAt)
+  return index.sessions.sort((a, b) => {
+    // 置顶项优先
+    if (a.pinned && !b.pinned) return -1
+    if (!a.pinned && b.pinned) return 1
+    // 同为置顶或同为非置顶，按更新时间降序
+    return b.updatedAt - a.updatedAt
+  })
 }
 
 /**
@@ -159,7 +165,7 @@ export function appendAgentMessage(id: string, message: AgentMessage): void {
  */
 export function updateAgentSessionMeta(
   id: string,
-  updates: Partial<Pick<AgentSessionMeta, 'title' | 'channelId' | 'sdkSessionId' | 'workspaceId'>>,
+  updates: Partial<Pick<AgentSessionMeta, 'title' | 'channelId' | 'sdkSessionId' | 'workspaceId' | 'pinned'>>,
 ): AgentSessionMeta {
   const index = readIndex()
   const idx = index.sessions.findIndex((s) => s.id === id)
diff --git a/apps/electron/src/preload/index.ts b/apps/electron/src/preload/index.ts
index 20c563f..c05467d 100644
--- a/apps/electron/src/preload/index.ts
+++ b/apps/electron/src/preload/index.ts
@@ -254,6 +254,9 @@ export interface ElectronAPI {
   /** 删除 Agent 会话 */
   deleteAgentSession: (id: string) => Promise<void>
 
+  /** 切换 Agent 会话置顶状态 */
+  togglePinAgentSession: (id: string) => Promise<AgentSessionMeta>
+
   /** 生成 Agent 会话标题 */
   generateAgentTitle: (input: AgentGenerateTitleInput) => Promise<string | null>
 
@@ -660,6 +663,10 @@ const electronAPI: ElectronAPI = {
     return ipcRenderer.invoke(AGENT_IPC_CHANNELS.DELETE_SESSION, id)
   },
 
+  togglePinAgentSession: (id: string) => {
+    return ipcRenderer.invoke(AGENT_IPC_CHANNELS.TOGGLE_PIN, id)
+  },
+
   generateAgentTitle: (input: AgentGenerateTitleInput) => {
     return ipcRenderer.invoke(AGENT_IPC_CHANNELS.GENERATE_TITLE, input)
   },
diff --git a/apps/electron/src/renderer/components/agent/AgentHeader.tsx b/apps/electron/src/renderer/components/agent/AgentHeader.tsx
index 2fd4846..3b98e74 100644
--- a/apps/electron/src/renderer/components/agent/AgentHeader.tsx
+++ b/apps/electron/src/renderer/components/agent/AgentHeader.tsx
@@ -7,8 +7,11 @@
 
 import * as React from 'react'
 import { useAtomValue, useSetAtom } from 'jotai'
-import { Pencil, Check, X } from 'lucide-react'
+import { Pencil, Check, X, Pin } from 'lucide-react'
 import { currentAgentSessionAtom, agentSessionsAtom } from '@/atoms/agent-atoms'
+import { Button } from '@/components/ui/button'
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
+import { cn } from '@/lib/utils'
 
 export function AgentHeader(): React.ReactElement | null {
   const session = useAtomValue(currentAgentSessionAtom)
@@ -101,6 +104,27 @@ export function AgentHeader(): React.ReactElement | null {
           </button>
         </div>
       )}
+
+      {/* 右侧按钮组 */}
+      <div className="flex items-center gap-1 titlebar-no-drag ml-auto">
+        <Tooltip>
+          <TooltipTrigger asChild>
+            <Button
+              type="button"
+              variant="ghost"
+              size="icon"
+              className={cn('h-7 w-7', session.pinned && 'bg-accent text-accent-foreground')}
+              onClick={async () => {
+                const updated = await window.electronAPI.togglePinAgentSession(session.id)
+                setAgentSessions((prev) => prev.map((s) => (s.id === updated.id ? updated : s)))
+              }}
+            >
+              <Pin className="size-3.5" />
+            </Button>
+          </TooltipTrigger>
+          <TooltipContent side="bottom"><p>{session.pinned ? '取消置顶' : '置顶会话'}</p></TooltipContent>
+        </Tooltip>
+      </div>
     </div>
   )
 }
diff --git a/apps/electron/src/renderer/components/app-shell/LeftSidebar.tsx b/apps/electron/src/renderer/components/app-shell/LeftSidebar.tsx
index b9a5379..a2ec32f 100644
--- a/apps/electron/src/renderer/components/app-shell/LeftSidebar.tsx
+++ b/apps/electron/src/renderer/components/app-shell/LeftSidebar.tsx
@@ -141,6 +141,8 @@ export function LeftSidebar({ width }: LeftSidebarProps): React.ReactElement {
   const [pendingDeleteId, setPendingDeleteId] = React.useState<string | null>(null)
   /** 置顶区域展开/收起 */
   const [pinnedExpanded, setPinnedExpanded] = React.useState(true)
+  /** Agent 置顶区域展开/收起 */
+  const [pinnedAgentExpanded, setPinnedAgentExpanded] = React.useState(true)
   const setUserProfile = useSetAtom(userProfileAtom)
   const selectedModel = useAtomValue(selectedModelAtom)
   const streamingIds = useAtomValue(streamingConversationIdsAtom)
@@ -289,6 +291,18 @@ export function LeftSidebar({ width }: LeftSidebarProps): React.ReactElement {
     }
   }
 
+  /** 切换 Agent 会话置顶状态 */
+  const handleTogglePinAgent = async (id: string): Promise<void> => {
+    try {
+      const updated = await window.electronAPI.togglePinAgentSession(id)
+      setAgentSessions((prev) =>
+        prev.map((s) => (s.id === updated.id ? updated : s))
+      )
+    } catch (error) {
+      console.error('[侧边栏] 切换 Agent 会话置顶失败:', error)
+    }
+  }
+
   /** 确认删除对话 */
   const handleConfirmDelete = async (): Promise<void> => {
     if (!pendingDeleteId) return
@@ -364,6 +378,12 @@ export function LeftSidebar({ width }: LeftSidebarProps): React.ReactElement {
     [agentSessions, currentWorkspaceId]
   )
 
+  /** 置顶 Agent 会话列表（按当前工作区过滤） */
+  const pinnedAgentSessions = React.useMemo(
+    () => filteredAgentSessions.filter((s) => s.pinned),
+    [filteredAgentSessions]
+  )
+
   /** Agent 会话按日期分组 */
   const agentSessionGroups = React.useMemo(
     () => groupByDate(filteredAgentSessions),
@@ -401,19 +421,39 @@ export function LeftSidebar({ width }: LeftSidebarProps): React.ReactElement {
 
       {/* Chat 模式：导航菜单（置顶区域） */}
       {mode === 'chat' && (
-        <div className="flex flex-col gap-1 pt-3 px-3">
-          <SidebarItem
-            icon={<Pin size={16} />}
-            label="置顶对话"
-            suffix={
-              pinnedConversations.length > 0 ? (
-                pinnedExpanded
-                  ? <ChevronDown size={14} className="text-foreground/40" />
-                  : <ChevronRight size={14} className="text-foreground/40" />
-              ) : undefined
-            }
+        <div className="px-3 pt-3">
+          <button
             onClick={() => handleItemClick('pinned')}
-          />
+            className="w-full flex items-center justify-between px-3 py-2 rounded-[10px] text-[13px] transition-colors duration-100 titlebar-no-drag text-foreground/60 hover:bg-foreground/[0.04] dark:hover:bg-foreground/[0.04] hover:text-foreground"
+          >
+            <div className="flex items-center gap-2">
+              <Pin size={14} />
+              <span>置顶对话</span>
+            </div>
+            {pinnedConversations.length > 0 && (
+              pinnedExpanded
+                ? <ChevronDown size={14} className="text-foreground/40" />
+                : <ChevronRight size={14} className="text-foreground/40" />
+            )}
+          </button>
+        </div>
+      )}
+
+      {/* Agent 模式：导航菜单（置顶区域） */}
+      {mode === 'agent' && pinnedAgentSessions.length > 0 && (
+        <div className="px-3 pt-3">
+          <button
+            onClick={() => setPinnedAgentExpanded(!pinnedAgentExpanded)}
+            className="w-full flex items-center justify-between px-3 py-2 rounded-[10px] text-[13px] transition-colors duration-100 titlebar-no-drag text-foreground/60 hover:bg-foreground/[0.04] dark:hover:bg-foreground/[0.04] hover:text-foreground"
+          >
+            <div className="flex items-center gap-2">
+              <Pin size={14} />
+              <span>置顶会话</span>
+            </div>
+            {pinnedAgentExpanded
+              ? <ChevronDown size={14} className="text-foreground/40" />
+              : <ChevronRight size={14} className="text-foreground/40" />}
+          </button>
         </div>
       )}
 
@@ -441,6 +481,30 @@ export function LeftSidebar({ width }: LeftSidebarProps): React.ReactElement {
         </div>
       )}
 
+      {/* Agent 模式：置顶会话区域 */}
+      {mode === 'agent' && pinnedAgentExpanded && pinnedAgentSessions.length > 0 && (
+        <div className="px-3 pt-1 pb-1">
+          <div className="flex flex-col gap-0.5 pl-1 border-l-2 border-primary/20 ml-2">
+            {pinnedAgentSessions.map((session) => (
+              <AgentSessionItem
+                key={`pinned-${session.id}`}
+                session={session}
+                active={session.id === currentAgentSessionId}
+                hovered={session.id === hoveredId}
+                running={agentRunningIds.has(session.id)}
+                showPinIcon={false}
+                onSelect={() => handleSelectAgentSession(session.id)}
+                onRequestDelete={() => handleRequestDelete(session.id)}
+                onRename={handleAgentRename}
+                onTogglePin={handleTogglePinAgent}
+                onMouseEnter={() => setHoveredId(session.id)}
+                onMouseLeave={() => setHoveredId(null)}
+              />
+            ))}
+          </div>
+        </div>
+      )}
+
       {/* 列表区域：根据模式切换 */}
       <div className="flex-1 overflow-y-auto px-3 pt-2 pb-3 scrollbar-none">
         {mode === 'chat' ? (
@@ -485,9 +549,11 @@ export function LeftSidebar({ width }: LeftSidebarProps): React.ReactElement {
                     active={session.id === currentAgentSessionId}
                     hovered={session.id === hoveredId}
                     running={agentRunningIds.has(session.id)}
+                    showPinIcon={!!session.pinned}
                     onSelect={() => handleSelectAgentSession(session.id)}
                     onRequestDelete={() => handleRequestDelete(session.id)}
                     onRename={handleAgentRename}
+                    onTogglePin={handleTogglePinAgent}
                     onMouseEnter={() => setHoveredId(session.id)}
                     onMouseLeave={() => setHoveredId(null)}
                   />
@@ -750,9 +816,11 @@ interface AgentSessionItemProps {
   active: boolean
   hovered: boolean
   running: boolean
+  showPinIcon?: boolean
   onSelect: () => void
   onRequestDelete: () => void
   onRename: (id: string, newTitle: string) => Promise<void>
+  onTogglePin?: (id: string) => void
   onMouseEnter: () => void
   onMouseLeave: () => void
 }
@@ -762,9 +830,11 @@ function AgentSessionItem({
   active,
   hovered,
   running,
+  showPinIcon,
   onSelect,
   onRequestDelete,
   onRename,
+  onTogglePin,
   onMouseEnter,
   onMouseLeave,
 }: AgentSessionItemProps): React.ReactElement {
@@ -773,6 +843,8 @@ function AgentSessionItem({
   const inputRef = React.useRef<HTMLInputElement>(null)
   const justStartedEditing = React.useRef(false)
 
+  const isPinned = !!session.pinned
+
   const startEdit = (): void => {
     setEditTitle(session.title)
     setEditing(true)
@@ -847,6 +919,10 @@ function AgentSessionItem({
                     <span className="relative block size-2 rounded-full bg-blue-500" />
                   </span>
                 )}
+                {/* 置顶标记 */}
+                {showPinIcon && (
+                  <Pin size={11} className="flex-shrink-0 text-primary/60" />
+                )}
                 <span className="truncate">{session.title}</span>
               </div>
             )}
@@ -870,6 +946,13 @@ function AgentSessionItem({
       </ContextMenuTrigger>
 
       <ContextMenuContent className="w-40">
+        <ContextMenuItem
+          className="gap-2 text-[13px]"
+          onSelect={() => onTogglePin?.(session.id)}
+        >
+          {isPinned ? <PinOff size={14} /> : <Pin size={14} />}
+          {isPinned ? '取消置顶' : '置顶会话'}
+        </ContextMenuItem>
         <ContextMenuItem
           className="gap-2 text-[13px]"
           onSelect={startEdit}
diff --git a/packages/shared/src/types/agent.ts b/packages/shared/src/types/agent.ts
index df0e7e6..3a5e2a4 100644
--- a/packages/shared/src/types/agent.ts
+++ b/packages/shared/src/types/agent.ts
@@ -205,6 +205,8 @@ export interface AgentSessionMeta {
   sdkSessionId?: string
   /** 所属工作区 ID */
   workspaceId?: string
+  /** 是否置顶 */
+  pinned?: boolean
   /** 创建时间戳 */
   createdAt: number
   /** 更新时间戳 */
@@ -524,6 +526,8 @@ export const AGENT_IPC_CHANNELS = {
   UPDATE_TITLE: 'agent:update-title',
   /** 删除会话 */
   DELETE_SESSION: 'agent:delete-session',
+  /** 切换会话置顶状态 */
+  TOGGLE_PIN: 'agent:toggle-pin',
 
   // 工作区管理
   /** 获取工作区列表 */