diff --git a/apps/desktop/src/renderer/src/App.tsx b/apps/desktop/src/renderer/src/App.tsx
index b858cdc..9a59d38 100644
--- a/apps/desktop/src/renderer/src/App.tsx
+++ b/apps/desktop/src/renderer/src/App.tsx
@@ -101,7 +101,12 @@ export default function App(): JSX.Element {
   }, [])
 
   const toggleSide = useCallback((): void => {
-    setSide((s) => ({ ...s, open: !s.open }))
+    setSide((s) => {
+      if (s.open) return { ...s, open: false }
+      // 当前面板仅承载浏览器标签：打开时无标签则自动补上
+      const tabs: SideTabType[] = s.tabs.includes('browser') ? s.tabs : [...s.tabs, 'browser']
+      return { ...s, open: true, tabs, active: s.active ?? 'browser' }
+    })
   }, [])
 
   const setSideWidth = useCallback((width: number): void => {
diff --git a/apps/desktop/src/renderer/src/components/SidePanel.tsx b/apps/desktop/src/renderer/src/components/SidePanel.tsx
index 94273da..2245666 100644
--- a/apps/desktop/src/renderer/src/components/SidePanel.tsx
+++ b/apps/desktop/src/renderer/src/components/SidePanel.tsx
@@ -1,24 +1,24 @@
-import { useEffect, useRef, useState, type ComponentType, type JSX, type ReactNode } from 'react'
+import { useEffect, useRef, type ComponentType, type JSX, type ReactNode } from 'react'
 import {
   LuChevronDown,
   LuFileDiff,
   LuGlobe,
   LuMessagesSquare,
-  LuPlus,
   LuSquareTerminal,
   LuX
 } from 'react-icons/lu'
 
 /**
  * 右侧通用侧边面板（ZCode 式标签页容器）。
- * 面板本身只负责：标签栏（收起 / 标签 / “+”菜单）、空态「打开标签页」宫格、
- * 左缘宽度拖拽；各标签的内容由外部传入（浏览器）或使用占位面板。
- * 每种标签同时至多一个实例；浏览器标签承载原生 WebContentsView 的对齐容器。
+ * 面板负责：标签栏（收起 / 标签）、空态「打开标签页」宫格、左缘宽度拖拽；
+ * 各标签的内容由外部传入。标签架构按多类型设计，当前仅开放浏览器，
+ * 后续新标签在 SIDE_TAB_ORDER 与内容分支里扩展即可。
  */
 
 export type SideTabType = 'assistant' | 'review' | 'terminal' | 'browser'
 
-export const SIDE_TAB_ORDER: SideTabType[] = ['assistant', 'review', 'terminal', 'browser']
+/** 当前对外开放的标签类型（浏览器）；新标签就绪后加入即可显示 */
+export const SIDE_TAB_ORDER: SideTabType[] = ['browser']
 
 type TabIcon = ComponentType<{ size?: number; className?: string }>
 
@@ -29,12 +29,6 @@ export const SIDE_TAB_META: Record<SideTabType, { title: string; icon: TabIcon }
   browser: { title: '浏览器', icon: LuGlobe }
 }
 
-const PLACEHOLDER_DESCRIPTION: Record<Exclude<SideTabType, 'browser'>, string> = {
-  assistant: '在侧边面板中与 Agent 展开一路并行的小对话，不打断主会话（即将支持）。',
-  review: '查看本会话中 Agent 产生的文件改动与差异，并逐项确认（即将支持）。',
-  terminal: '在侧边面板中打开与当前工作区绑定的终端（即将支持）。'
-}
-
 const PANEL_MIN_WIDTH = 380
 const PANEL_MAX_WIDTH = 760
 
@@ -63,7 +57,6 @@ export function SidePanel({
   onCollapse,
   browser
 }: SidePanelProps): JSX.Element {
-  const [menuOpen, setMenuOpen] = useState(false)
   const dragRef = useRef<{ startX: number; startWidth: number } | null>(null)
 
   // 面板宽度拖拽（左边缘把手）
@@ -147,68 +140,20 @@ export function SidePanel({
               </button>
             )
           })}
-
-          <div className="relative">
-            <button
-              type="button"
-              aria-label="打开新的标签"
-              title="打开新的标签"
-              onClick={() => setMenuOpen((v) => !v)}
-              className="flex size-7 shrink-0 items-center justify-center rounded text-zinc-400 transition-colors hover:bg-zinc-100 hover:text-zinc-600"
-            >
-              <LuPlus size={13} />
-            </button>
-            {menuOpen && (
-              <>
-                <div className="fixed inset-0 z-10" onClick={() => setMenuOpen(false)} />
-                <div className="absolute right-0 top-8 z-20 w-40 rounded-lg border border-zinc-200 bg-white py-1 shadow-xl shadow-zinc-300/40">
-                  {SIDE_TAB_ORDER.map((type) => {
-                    const { title, icon: Icon } = SIDE_TAB_META[type]
-                    const opened = tabs.includes(type)
-                    return (
-                      <button
-                        key={type}
-                        type="button"
-                        disabled={opened}
-                        onClick={() => {
-                          setMenuOpen(false)
-                          onOpenTab(type)
-                        }}
-                        className="flex w-full items-center gap-2 px-2.5 py-1.5 text-left text-[12px] text-zinc-600 transition-colors hover:bg-zinc-100 disabled:cursor-default disabled:text-zinc-300 disabled:hover:bg-transparent"
-                      >
-                        <Icon size={12} className="shrink-0" />
-                        {title}
-                        {opened && <span className="ml-auto text-[10px] text-zinc-300">已打开</span>}
-                      </button>
-                    )
-                  })}
-                </div>
-              </>
-            )}
-          </div>
+          {/* “+”新增标签菜单随更多标签类型一起回归（当前仅浏览器，无需新增入口） */}
         </div>
       )}
 
       {tabs.length === 0 ? (
         <EmptyState onOpen={onOpenTab} />
       ) : (
-        <div className="relative min-h-0 flex-1">
-          {current === 'browser' ? (
-            browser
-          ) : current ? (
-            <PlaceholderPanel
-              icon={SIDE_TAB_META[current].icon}
-              title={SIDE_TAB_META[current].title}
-              description={PLACEHOLDER_DESCRIPTION[current as Exclude<SideTabType, 'browser'>]}
-            />
-          ) : null}
-        </div>
+        <div className="relative min-h-0 flex-1">{current === 'browser' ? browser : null}</div>
       )}
     </aside>
   )
 }
 
-/** 空态：无任何标签时的「打开标签页」宫格 */
+/** 空态：无任何标签时的「打开标签页」宫格（随 SIDE_TAB_ORDER 展示可用标签） */
 function EmptyState({ onOpen }: { onOpen: (type: SideTabType) => void }): JSX.Element {
   return (
     <div className="flex h-full min-w-0 flex-1 flex-col items-center justify-center gap-6 px-8">
@@ -235,22 +180,3 @@ function EmptyState({ onOpen }: { onOpen: (type: SideTabType) => void }): JSX.El
     </div>
   )
 }
-
-/** 尚未落地的标签占位页 */
-function PlaceholderPanel({
-  icon: Icon,
-  title,
-  description
-}: {
-  icon: TabIcon
-  title: string
-  description: string
-}): JSX.Element {
-  return (
-    <div className="flex h-full flex-col items-center justify-center gap-3 px-8 text-center">
-      <Icon size={28} className="text-zinc-300" />
-      <div className="text-[13px] font-medium text-zinc-600">{title}</div>
-      <p className="max-w-60 text-[11.5px] leading-relaxed text-zinc-400">{description}</p>
-    </div>
-  )
-}