diff --git a/frontend/src/app/workspace/chats/[thread_id]/page.tsx b/frontend/src/app/workspace/chats/[thread_id]/page.tsx
index 635b2166..dfc7a8e6 100644
--- a/frontend/src/app/workspace/chats/[thread_id]/page.tsx
+++ b/frontend/src/app/workspace/chats/[thread_id]/page.tsx
@@ -37,6 +37,7 @@ import { textOfMessage } from "@/core/threads/utils";
 import { env } from "@/env";
 import { useSelectedSkillListener } from "@/hooks/use-selected-skill-listener";
 import { cn } from "@/lib/utils";
+import { IframeTestPanel } from "@/components/workspace/iframe-test-panel";
 
 export default function ChatPage() {
   const { t } = useI18n();
@@ -63,7 +64,7 @@ export default function ChatPage() {
     showWelcomeStyle,
   } = useThreadChat();
   
-  // 新逻辑：历史渲染和新会话仅由路由 /chats/new 控制，不再读取 isnew/show_reuse_welcome 参数。
+  // 新逻辑：历史渲染和新会话仅由路由 /chats/new 控制，不再读取 isnew/is_chatting 参数。
   const shouldRenderHistory = !showWelcomeStyle;
   const createNewSession = useMemo(() => isNewThread, [isNewThread]);
 
@@ -485,8 +486,8 @@ export default function ChatPage() {
                   }
                   setShowExitDialog(false);
                   sendToParent({
-                    type: POST_MESSAGE_TYPES.SHOW_REUSE_WELCOME,
-                    showReuseWelcome: true,
+                    type: POST_MESSAGE_TYPES.IS_CHATTING,
+                    isChatting: false,
                   });
                   resetNewSessionState();
                   // 始终复用 query 中的 thread_id。
@@ -532,7 +533,7 @@ export default function ChatPage() {
         </DevDialog>
 
         {/* MARK: 开发测试：iframe 通信功能测试面板 */}
-        {/* {process.env.NODE_ENV !== "production" && <IframeTestPanel />} */}
+        {process.env.NODE_ENV !== "production" && <IframeTestPanel />}
       </div>
     </ThreadContext.Provider>
   );
diff --git a/frontend/src/components/workspace/chats/use-thread-chat.ts b/frontend/src/components/workspace/chats/use-thread-chat.ts
index 9f6098a2..b056898f 100644
--- a/frontend/src/components/workspace/chats/use-thread-chat.ts
+++ b/frontend/src/components/workspace/chats/use-thread-chat.ts
@@ -10,9 +10,9 @@ export function useThreadChat() {
   const searchParams = useSearchParams();
   const threadIdFromSearchParams = searchParams.get("thread_id")?.trim();
   // showWelcomeStyle的子判断
-  const showReuseWelcomeFromQuery = (() => {
-    const showReuseWelcome = searchParams.get("show_reuse_welcome");
-    return showReuseWelcome === "true";
+  const isChattingFromQuery = (() => {
+    const isChatting = searchParams.get("is_chatting");
+    return isChatting === "true";
   })();
   // 兜底：当 params 还未就绪时，从 pathname 解析 thread_id。
   const threadIdFromPathname = (() => {
@@ -77,7 +77,7 @@ export function useThreadChat() {
   const [isNewThread, setIsNewThread] = useState(() => isNewRoute);
 
   const [showWelcomeStyle, setShowWelcomeStyle] = useState(() => {
-    return isNewRoute || showReuseWelcomeFromQuery;
+    return isNewRoute || !isChattingFromQuery;
   });
   // console.log("[useThreadChat] effectiveThreadIdFromPath", effectiveThreadIdFromPath);
 
@@ -94,13 +94,13 @@ export function useThreadChat() {
     setIsNewThread(isNewRoute);
     // Prefer path thread id, fall back to query thread_id when path is /new.
     setThreadId(threadIdFromPathOrParams);
-    setShowWelcomeStyle(isNewRoute || showReuseWelcomeFromQuery);
+    setShowWelcomeStyle(isNewRoute || !isChattingFromQuery);
   }, [
     isNewRoute,
     normalizeThreadId,
     pathname,
     searchParams,
-    showReuseWelcomeFromQuery,
+    isChattingFromQuery,
     threadId,
     threadIdFromPathOrParams,
   ]);
diff --git a/frontend/src/components/workspace/iframe-test-panel.tsx b/frontend/src/components/workspace/iframe-test-panel.tsx
index a900a5e3..a1589fb0 100644
--- a/frontend/src/components/workspace/iframe-test-panel.tsx
+++ b/frontend/src/components/workspace/iframe-test-panel.tsx
@@ -46,7 +46,7 @@ export function IframeTestPanel() {
   }
 
   function handleEnterSkillMode() {
-    router.push(`?mode=skill&skill_id=123&title=测试技能`);
+    router.push(`?mode=skill`);
     addLog("进入 mode=skill，URL 已更新");
   }
 
@@ -56,8 +56,13 @@ export function IframeTestPanel() {
   }
 
   function handleSendSelectSkill() {
-    iframeSkill.sendSelectSkill("skill_001");
-    addLog("postMessage → selectSkill (skill_id=skill_001)");
+    iframeSkill.sendSelectSkill(["skill_001"]);
+    addLog("postMessage → selectSkill (skill_id=['skill_001'])");
+  }
+
+  function handleSendSelectSkillArray() {
+    iframeSkill.sendSelectSkill(["1246", "1247", "1248"]);
+    addLog("postMessage → selectSkill (skill_id=['1246','1247','1248'])");
   }
 
   function handleOpenSkillDialog() {
@@ -67,7 +72,7 @@ export function IframeTestPanel() {
 
   function handleClearSkill() {
     iframeSkill.clearSkill();
-    addLog("clearSkill 已调用，postMessage → skill_id=0");
+    addLog("clearSkill 已调用，postMessage → skill_id=[]");
   }
 
   function handleTestClipboardCopy() {
@@ -76,12 +81,12 @@ export function IframeTestPanel() {
     addLog(`copyToClipboard → "${testText.slice(0, 30)}..."`);
   }
 
-  function handleSendShowReuseWelcome(showReuseWelcome: boolean) {
+  function handleSendIsChatting(isChatting: boolean) {
     sendToParent({
-      type: POST_MESSAGE_TYPES.SHOW_REUSE_WELCOME,
-      showReuseWelcome: showReuseWelcome,
+      type: POST_MESSAGE_TYPES.IS_CHATTING,
+      isChatting: isChatting,
     });
-    addLog(`postMessage → show_reuse_welcome (${showReuseWelcome})`);
+    addLog(`postMessage → is_chatting (${isChatting})`);
   }
 
   function handlePointerDown(event: ReactPointerEvent<HTMLDivElement>) {
@@ -231,7 +236,15 @@ export function IframeTestPanel() {
               variant="ghost"
               onClick={handleSendSelectSkill}
             >
-              sendSelectSkill (skill_001)
+              sendSelectSkill（单个）
+            </Button>
+            <Button
+              size="sm"
+              className="w-full bg-violet-50 text-xs text-violet-700 hover:bg-violet-100"
+              variant="ghost"
+              onClick={handleSendSelectSkillArray}
+            >
+              sendSelectSkill（数组）
             </Button>
             <Button
               size="sm"
@@ -247,7 +260,7 @@ export function IframeTestPanel() {
               variant="ghost"
               onClick={handleClearSkill}
             >
-              clearSkill (发送 skill_id=0)
+              clearSkill (发送 skill_id=[])
             </Button>
           </div>
         </div>
@@ -327,17 +340,17 @@ export function IframeTestPanel() {
           </div>
         </div>
 
-        {/* 场景 5：show_reuse_welcome */}
+        {/* 场景 5：is_chatting */}
         <div>
           <div className="mb-1 text-xs font-semibold text-gray-500">
-            ⑤ show_reuse_welcome
+            ⑤ is_chatting
           </div>
           <div className="flex gap-2">
             <Button
               size="sm"
               className="flex-1 bg-emerald-50 text-xs text-emerald-700 hover:bg-emerald-100"
               variant="ghost"
-              onClick={() => handleSendShowReuseWelcome(true)}
+              onClick={() => handleSendIsChatting(true)}
             >
               发送 true
             </Button>
@@ -345,7 +358,7 @@ export function IframeTestPanel() {
               size="sm"
               className="flex-1 bg-slate-50 text-xs text-slate-700 hover:bg-slate-100"
               variant="ghost"
-              onClick={() => handleSendShowReuseWelcome(false)}
+              onClick={() => handleSendIsChatting(false)}
             >
               发送 false
             </Button>
diff --git a/frontend/src/components/workspace/input-box.tsx b/frontend/src/components/workspace/input-box.tsx
index 9f74c531..40bc98a0 100644
--- a/frontend/src/components/workspace/input-box.tsx
+++ b/frontend/src/components/workspace/input-box.tsx
@@ -213,8 +213,8 @@ export function InputBox({
       setIsFocused(false);
       if (showWelcomeStyle) {
         sendToParent({
-          type: POST_MESSAGE_TYPES.SHOW_REUSE_WELCOME,
-          showReuseWelcome: false,
+          type: POST_MESSAGE_TYPES.IS_CHATTING,
+          isChatting: true,
         });
       }
       onSubmit?.(message);
@@ -491,7 +491,7 @@ export function InputBox({
 function SuggestionListContainer({
   sendSelectSkill,
 }: {
-  sendSelectSkill: (skill_id: string) => void;
+  sendSelectSkill: (skill_id: string[]) => void;
 }) {
   return (
     <div className="absolute right-0 bottom-0 left-0 z-0 flex translate-y-full items-center justify-center pt-4">
@@ -504,7 +504,7 @@ function SuggestionListContainer({
 function SuggestionList({
   sendSelectSkill,
 }: {
-  sendSelectSkill: (skill_id: string) => void;
+  sendSelectSkill: (skill_id: string[]) => void;
 }) {
   const { t } = useI18n();
   const { textInput } = usePromptInputController();
@@ -517,9 +517,23 @@ function SuggestionList({
   );
 
   const handleSuggestionClick = useCallback(
-    (suggestion: { prompt: string; skill_id?: string }) => {
-      // 如果有 skill_id，发送给宿主页
-      if (suggestion.skill_id) {
+    (
+      suggestion: {
+        prompt: string;
+        skill_id?: string[];
+        children?: { skill_id: string[] }[];
+      },
+    ) => {
+      // 优先从 children 中提取 skill_id 数组，发送给宿主页
+      const childSkillIds = (suggestion.children ?? [])
+        .flatMap((item) => item.skill_id)
+        .map((item) => item.trim())
+        .filter((id): id is string => Boolean(id));
+      if (childSkillIds.length > 0) {
+        sendSelectSkill(childSkillIds);
+        return;
+      }
+      if (suggestion.skill_id && suggestion.skill_id.length > 0) {
         sendSelectSkill(suggestion.skill_id);
         return;
       }
diff --git a/frontend/src/core/iframe-messages.ts b/frontend/src/core/iframe-messages.ts
index a5cd892b..56eaf49b 100644
--- a/frontend/src/core/iframe-messages.ts
+++ b/frontend/src/core/iframe-messages.ts
@@ -9,8 +9,8 @@
 export const POST_MESSAGE_TYPES = {
   // 全屏切换
   FULLSCREEN: "fullscreen",
-  // 是否展示复用欢迎态
-  SHOW_REUSE_WELCOME: "showReuseWelcome",
+  // 会话是否处于聊天态
+  IS_CHATTING: "isChatting",
   // 选择预定义 skill
   SELECT_SKILL: "selectSkill",
   // 打开 skill 选择对话框
@@ -35,14 +35,14 @@ export interface FullscreenMessage {
   fullscreen: boolean;
 }
 
-export interface ShowReuseWelcomeMessage {
-  type: typeof POST_MESSAGE_TYPES.SHOW_REUSE_WELCOME;
-  showReuseWelcome: boolean;
+export interface IsChattingMessage {
+  type: typeof POST_MESSAGE_TYPES.IS_CHATTING;
+  isChatting: boolean;
 }
 
 export interface SelectSkillMessage {
   type: typeof POST_MESSAGE_TYPES.SELECT_SKILL;
-  skill_id: string;
+  skill_id: string[];
 }
 
 export interface OpenSkillDialogMessage {
@@ -79,7 +79,7 @@ export function isSelectedSkillMessage(value: unknown): value is SelectedSkillMe
 export function sendToParent(
   message:
     | FullscreenMessage
-    | ShowReuseWelcomeMessage
+    | IsChattingMessage
     | SelectSkillMessage
     | OpenSkillDialogMessage,
 ): void {
diff --git a/frontend/src/hooks/use-iframe-skill.ts b/frontend/src/hooks/use-iframe-skill.ts
index afb68636..2533eca6 100644
--- a/frontend/src/hooks/use-iframe-skill.ts
+++ b/frontend/src/hooks/use-iframe-skill.ts
@@ -17,7 +17,7 @@ interface SkillData {
 // Hook 返回类型
 interface UseIframeSkillReturn {
   selectedSkill: SkillData | null;
-  sendSelectSkill: (skill_id: string) => void;
+  sendSelectSkill: (skill_id: string[]) => void;
   openSkillDialog: () => void;
   clearSkill: () => void;
 }
@@ -25,29 +25,30 @@ interface UseIframeSkillReturn {
 export function useIframeSkill(): UseIframeSkillReturn {
   const router = useRouter();
   const searchParams = useSearchParams();
-  const skillIdFromQuery = searchParams.get("skill_id");
-  const titleFromQuery = searchParams.get("title");
   const threadIdFromQuery = searchParams.get("thread_id");
-  const showReuseWelcomeFromQuery = searchParams.get("show_reuse_welcome");
+  const isChattingFromQuery = searchParams.get("is_chatting");
   const lastThreadIdRef = useRef<string | null>(null);
 
   const [selectedSkill, setSelectedSkill] = useState<SkillData | null>(null);
 
-  // 1. 监听 query 参数变化
-  useEffect(() => {
-    if (skillIdFromQuery && titleFromQuery) {
-      setSelectedSkill({ skill_id: skillIdFromQuery, title: titleFromQuery });
-    }
-  }, [skillIdFromQuery, titleFromQuery]);
+  // 1. 监听 query 参数变化（临时禁用）
+  // TODO: 当前 skill 仅通过 iframe postMessage 传递，暂不从 URL 读取 skill_id/title。
+  // useEffect(() => {
+  //   const skillIdFromQuery = searchParams.get("skill_id");
+  //   const titleFromQuery = searchParams.get("title");
+  //   if (skillIdFromQuery && titleFromQuery) {
+  //     setSelectedSkill({ skill_id: skillIdFromQuery, title: titleFromQuery });
+  //   }
+  // }, [searchParams]);
 
-  // 0. 监听 query 中 show_reuse_welcome=false 且带 thread_id 时跳转到 thread 页面
+  // 0. 监听 query 中 is_chatting=true 且带 thread_id 时跳转到 thread 页面
   useEffect(() => {
     if (!threadIdFromQuery) return;
-    if (showReuseWelcomeFromQuery !== "false") return;
+    if (isChattingFromQuery !== "true") return;
     if (lastThreadIdRef.current === threadIdFromQuery) return;
     lastThreadIdRef.current = threadIdFromQuery;
     router.replace(`/workspace/chats/${threadIdFromQuery}`);
-  }, [router, showReuseWelcomeFromQuery, threadIdFromQuery]);
+  }, [isChattingFromQuery, router, threadIdFromQuery]);
 
   // 2. 监听宿主页 postMessage
   useEffect(() => {
@@ -67,7 +68,7 @@ export function useIframeSkill(): UseIframeSkillReturn {
   }, []);
 
   // 发送选择预定义 skill
-  const sendSelectSkill = useCallback((skill_id: string) => {
+  const sendSelectSkill = useCallback((skill_id: string[]) => {
     const message = { type: POST_MESSAGE_TYPES.SELECT_SKILL, skill_id };
     console.log("[useIframeSkill] sendSelectSkill:", message);
     sendToParent(message);
@@ -83,12 +84,12 @@ export function useIframeSkill(): UseIframeSkillReturn {
     sendToParent(message);
   }, []);
 
-  // 清除选中并发送 skill_id=0 给主页
+  // 清除选中并发送空 skill_id 数组给主页
   const clearSkill = useCallback(() => {
     setSelectedSkill(null);
-    // 发送 skill_id=0 给主页，通知取消选择
-    const message = { type: POST_MESSAGE_TYPES.SELECT_SKILL, skill_id: "0" };
-    console.log("[useIframeSkill] clearSkill, sending skill_id=0:", message);
+    // 发送空数组给主页，通知取消选择
+    const message = { type: POST_MESSAGE_TYPES.SELECT_SKILL, skill_id: [] };
+    console.log("[useIframeSkill] clearSkill, sending skill_id=[]:", message);
     sendToParent(message);
   }, []);
 
diff --git a/frontend/tests/e2e/support/chat-helpers.ts b/frontend/tests/e2e/support/chat-helpers.ts
index 446c8e22..a46586ad 100644
--- a/frontend/tests/e2e/support/chat-helpers.ts
+++ b/frontend/tests/e2e/support/chat-helpers.ts
@@ -29,11 +29,11 @@ export function skipIfMissingThread(
 
 export function buildChatUrl({
   pathThreadId,
-  showReuseWelcome,
+  isChatting,
   threadId,
 }: {
   pathThreadId?: string;
-  showReuseWelcome: boolean;
+  isChatting: boolean;
   threadId: string;
 }) {
   const resolvedThreadId = threadId ?? pathThreadId;
@@ -42,7 +42,7 @@ export function buildChatUrl({
   }
 
   const query = new URLSearchParams();
-  query.set("show_reuse_welcome", String(showReuseWelcome));
+  query.set("is_chatting", String(isChatting));
   if (resolvedThreadId) {
     query.set("thread_id", resolvedThreadId);
   }
@@ -55,20 +55,20 @@ export function buildChatUrl({
 
 export function invalidNewChatUrl() {
   const query = new URLSearchParams();
-  query.set("show_reuse_welcome", "true");
+  query.set("is_chatting", "false");
   return `/workspace/chats/new?${query.toString()}`;
 }
 
 export function newChatEntry(threadId: string) {
   return buildChatUrl({
-    showReuseWelcome: true,
+    isChatting: false,
     threadId,
   });
 }
 
 export function reuseThreadWelcomeEntry(threadId: string) {
   return buildChatUrl({
-    showReuseWelcome: true,
+    isChatting: false,
     threadId,
   });
 }
@@ -76,7 +76,7 @@ export function reuseThreadWelcomeEntry(threadId: string) {
 export function reuseThreadChatEntry(threadId: string) {
   return buildChatUrl({
     pathThreadId: threadId,
-    showReuseWelcome: false,
+    isChatting: true,
     threadId,
   });
 }