diff --git a/frontend-web/src/components/workspace/agents/agent-chat-sidebar.tsx b/frontend-web/src/components/workspace/agents/agent-chat-sidebar.tsx
index 6863e4c4..a87be6ba 100644
--- a/frontend-web/src/components/workspace/agents/agent-chat-sidebar.tsx
+++ b/frontend-web/src/components/workspace/agents/agent-chat-sidebar.tsx
@@ -2,6 +2,7 @@
 
 import {
   Bot,
+  ChevronDown,
   Download,
   FileJson,
   FileText,
@@ -127,6 +128,18 @@ export function AgentChatSidebar({ activeAgentId }: { activeAgentId?: string })
     return () => clearTimeout(timer);
   }, [searchInput]);
 
+  // 「智能体」区可收起（持久化）；收起后只留标题栏，下方「最近的对话」占满剩余空间。
+  const [agentsCollapsed, setAgentsCollapsed] = useState(
+    () =>
+      typeof window !== "undefined" &&
+      localStorage.getItem("agent-chat-sidebar:agents-collapsed") === "true",
+  );
+  const toggleAgents = () =>
+    setAgentsCollapsed((v) => {
+      localStorage.setItem("agent-chat-sidebar:agents-collapsed", String(!v));
+      return !v;
+    });
+
   // 若所选广场被管理员删除，回退到「我的」，避免指向不存在的广场。
   useEffect(() => {
     if (
@@ -151,119 +164,148 @@ export function AgentChatSidebar({ activeAgentId }: { activeAgentId?: string })
   return (
     // 配色与 AgentModuleSidebar 一致：浅色白底，深蓝主题半透明深蓝玻璃面板。
     <aside className="flex h-full w-(--sidebar-width) shrink-0 flex-col overflow-hidden border-r border-border/70 bg-white text-foreground backdrop-blur-md dark:border-[#2b8ffe]/45 dark:bg-[#032650]/80">
-      {/* 顶部：作用域下拉（我的 / 各广场）+ 智能体名称模糊搜索 */}
-      <div className="shrink-0 space-y-2 border-b border-border/60 px-3 py-2.5">
-        <Select value={scope} onValueChange={setScope}>
-          <SelectTrigger className="h-9 w-full text-sm" title="切换智能体来源">
-            <SelectValue />
-          </SelectTrigger>
-          <SelectContent position="popper" side="bottom" sideOffset={4}>
-            <SelectItem value={MINE_SCOPE}>我的</SelectItem>
-            {squares.map((sq) => (
-              <SelectItem key={sq.id} value={sq.id}>
-                {sq.name}
-              </SelectItem>
-            ))}
-          </SelectContent>
-        </Select>
-        <div className="relative">
-          <Search className="text-muted-foreground pointer-events-none absolute top-1/2 left-2.5 size-3.5 -translate-y-1/2" />
-          <Input
-            value={searchInput}
-            onChange={(e) => setSearchInput(e.target.value)}
-            placeholder="搜索智能体名称"
-            className="h-9 pl-8 pr-8 text-sm"
-            aria-label="搜索智能体名称"
-          />
-          {searchInput && (
-            <button
-              type="button"
-              onClick={() => setSearchInput("")}
-              className="text-muted-foreground hover:text-foreground absolute top-1/2 right-2 -translate-y-1/2"
-              title="清除"
-              aria-label="清除搜索"
-            >
-              <X className="size-3.5" />
-            </button>
-          )}
-        </div>
-      </div>
-
-      {/* 智能体列表（上半，独立滚动） */}
-      <div className="flex min-h-0 flex-[3] flex-col overflow-y-auto px-2 py-3">
-        <h2 className="mb-1 px-3 py-1 text-[11px] font-semibold tracking-[0.04em] text-muted-foreground/80 select-none">
-          智能体
-        </h2>
-        {isLoading && agents.length === 0 ? (
-          <div className="text-muted-foreground flex h-24 items-center justify-center gap-2 text-xs">
-            <Loader2 className="size-3.5 animate-spin" />
-            加载中…
-          </div>
-        ) : agents.length === 0 ? (
-          <p className="px-3 py-1.5 text-xs text-muted-foreground/70">
-            {search ? "未找到匹配的智能体" : isMine ? "暂无智能体" : "该广场暂无智能体"}
-          </p>
-        ) : (
-          <div
+      {/* 智能体（上半，可收起）。展开时：标题栏 + 来源下拉/名称搜索 + 列表；
+          收起时只留标题栏，下方「最近的对话」占满剩余空间。 */}
+      <div
+        className={cn(
+          "flex flex-col",
+          agentsCollapsed ? "shrink-0" : "min-h-0 flex-[3]",
+        )}
+      >
+        <button
+          type="button"
+          onClick={toggleAgents}
+          className="text-foreground/80 hover:bg-accent/40 flex shrink-0 items-center justify-between border-b border-border/60 px-3 py-2.5 text-[12px] font-semibold transition-colors select-none"
+          title={agentsCollapsed ? "展开智能体" : "收起智能体"}
+        >
+          <span>智能体</span>
+          <ChevronDown
             className={cn(
-              "flex flex-col gap-1 transition-opacity",
-              isFetching && "opacity-60",
+              "text-muted-foreground size-4 shrink-0 transition-transform duration-200",
+              agentsCollapsed && "-rotate-90",
             )}
-          >
-            {agents.map((agent) => {
-              const href = `${routeBase}/agents/${agent.id}/chats/new`;
-              const isActive = agent.id === activeAgentId;
-              const { from, to } = agentColor(agent.id, isDark);
-              return (
-                <Link
-                  key={agent.id}
-                  href={href}
+          />
+        </button>
+
+        {!agentsCollapsed && (
+          <>
+            {/* 来源下拉（我的 / 各广场）+ 智能体名称模糊搜索 */}
+            <div className="shrink-0 space-y-2 border-b border-border/60 px-3 py-2.5">
+              <Select value={scope} onValueChange={setScope}>
+                <SelectTrigger className="h-9 w-full text-sm" title="切换智能体来源">
+                  <SelectValue />
+                </SelectTrigger>
+                <SelectContent position="popper" side="bottom" sideOffset={4}>
+                  <SelectItem value={MINE_SCOPE}>我的</SelectItem>
+                  {squares.map((sq) => (
+                    <SelectItem key={sq.id} value={sq.id}>
+                      {sq.name}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+              <div className="relative">
+                <Search className="text-muted-foreground pointer-events-none absolute top-1/2 left-2.5 size-3.5 -translate-y-1/2" />
+                <Input
+                  value={searchInput}
+                  onChange={(e) => setSearchInput(e.target.value)}
+                  placeholder="搜索智能体名称"
+                  className="h-9 pl-8 pr-8 text-sm"
+                  aria-label="搜索智能体名称"
+                />
+                {searchInput && (
+                  <button
+                    type="button"
+                    onClick={() => setSearchInput("")}
+                    className="text-muted-foreground hover:text-foreground absolute top-1/2 right-2 -translate-y-1/2"
+                    title="清除"
+                    aria-label="清除搜索"
+                  >
+                    <X className="size-3.5" />
+                  </button>
+                )}
+              </div>
+            </div>
+
+            {/* 智能体列表（独立滚动） */}
+            <div className="flex min-h-0 flex-1 flex-col overflow-y-auto px-2 py-3">
+              {isLoading && agents.length === 0 ? (
+                <div className="text-muted-foreground flex h-24 items-center justify-center gap-2 text-xs">
+                  <Loader2 className="size-3.5 animate-spin" />
+                  加载中…
+                </div>
+              ) : agents.length === 0 ? (
+                <p className="px-3 py-1.5 text-xs text-muted-foreground/70">
+                  {search
+                    ? "未找到匹配的智能体"
+                    : isMine
+                      ? "暂无智能体"
+                      : "该广场暂无智能体"}
+                </p>
+              ) : (
+                <div
                   className={cn(
-                    "group relative flex w-full items-start gap-2.5 rounded-xl border px-2.5 py-2 transition-colors",
-                    isActive
-                      ? "border-primary/40 bg-primary/5"
-                      : "border-transparent hover:border-border hover:bg-accent/50",
+                    "flex flex-col gap-1 transition-opacity",
+                    isFetching && "opacity-60",
                   )}
                 >
-                  <span
-                    className="mt-0.5 flex size-9 shrink-0 items-center justify-center rounded-lg text-white shadow-sm"
-                    style={{
-                      backgroundImage: `linear-gradient(135deg, ${from}, ${to})`,
-                    }}
-                  >
-                    <Bot className="size-[18px]" />
-                  </span>
-                  <span className="min-w-0 flex-1">
-                    <span
-                      className={cn(
-                        "block truncate text-[13px] font-semibold",
-                        isActive ? "text-primary" : "text-foreground",
-                      )}
+                  {agents.map((agent) => {
+                    const href = `${routeBase}/agents/${agent.id}/chats/new`;
+                    const isActive = agent.id === activeAgentId;
+                    const { from, to } = agentColor(agent.id, isDark);
+                    return (
+                      <Link
+                        key={agent.id}
+                        href={href}
+                        className={cn(
+                          "group relative flex w-full items-start gap-2.5 rounded-xl border px-2.5 py-2 transition-colors",
+                          isActive
+                            ? "border-primary/40 bg-primary/5"
+                            : "border-transparent hover:border-border hover:bg-accent/50",
+                        )}
+                      >
+                        <span
+                          className="mt-0.5 flex size-9 shrink-0 items-center justify-center rounded-lg text-white shadow-sm"
+                          style={{
+                            backgroundImage: `linear-gradient(135deg, ${from}, ${to})`,
+                          }}
+                        >
+                          <Bot className="size-[18px]" />
+                        </span>
+                        <span className="min-w-0 flex-1">
+                          <span
+                            className={cn(
+                              "block truncate text-[13px] font-semibold",
+                              isActive ? "text-primary" : "text-foreground",
+                            )}
+                          >
+                            {desensitize(agent.name)}
+                          </span>
+                          <span className="mt-0.5 block truncate text-[11px] leading-snug text-muted-foreground">
+                            {agent.description
+                              ? desensitize(agent.description)
+                              : "智能体助手"}
+                          </span>
+                        </span>
+                        {isActive && (
+                          <span className="absolute top-1/2 right-1 h-6 w-1 -translate-y-1/2 rounded-full bg-primary" />
+                        )}
+                      </Link>
+                    );
+                  })}
+                  {/* 超出一页时引导到完整的智能体管理页（不在侧边栏静默截断） */}
+                  {total > agents.length && (
+                    <Link
+                      href={`${routeBase}/agents`}
+                      className="text-muted-foreground hover:text-foreground hover:bg-accent/50 mt-0.5 rounded-lg px-3 py-1.5 text-center text-xs transition-colors"
                     >
-                      {desensitize(agent.name)}
-                    </span>
-                    <span className="mt-0.5 block truncate text-[11px] leading-snug text-muted-foreground">
-                      {agent.description
-                        ? desensitize(agent.description)
-                        : "智能体助手"}
-                    </span>
-                  </span>
-                  {isActive && (
-                    <span className="absolute top-1/2 right-1 h-6 w-1 -translate-y-1/2 rounded-full bg-primary" />
+                      共 {total} 个，查看全部 →
+                    </Link>
                   )}
-                </Link>
-              );
-            })}
-            {/* 超出一页时引导到完整的智能体管理页（不在侧边栏静默截断） */}
-            {total > agents.length && (
-              <Link
-                href={`${routeBase}/agents`}
-                className="text-muted-foreground hover:text-foreground mt-0.5 rounded-lg px-3 py-1.5 text-center text-xs transition-colors hover:bg-accent/50"
-              >
-                共 {total} 个，查看全部 →
-              </Link>
-            )}
-          </div>
+                </div>
+              )}
+            </div>
+          </>
         )}
       </div>