diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index ec2dbad9..40180c47 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -213,6 +213,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   async function submitMessage(text: string): Promise<void> {
     const value = text.trim();
     if (!value) return;
+    beginWorkspaceSelection();
     if (!composer.value.sessionId) {
       messages.value.push(makeMessage("system", "session_required：请先显式新建或选择 Code Agent session。", "blocked", { title: "需要 Session" }));
       return;