diff --git a/app/components/agent/AgentSidebar.vue b/app/components/agent/AgentSidebar.vue
index d66c249..f49a1d9 100644
--- a/app/components/agent/AgentSidebar.vue
+++ b/app/components/agent/AgentSidebar.vue
@@ -32,7 +32,7 @@ const isAdmin = computed(() => props.user?.role === "admin");
   <aside class="agent-sidebar desktop" :class="{ collapsed }">
     <div class="sidebar-header">
       <AgentSwitcher
-        v-if="currentAgentSlug"
+        v-if="currentAgentSlug && loggedIn"
         :current-slug="currentAgentSlug"
         @switch="emit('switchAgent', $event)"
       />
@@ -110,7 +110,7 @@ const isAdmin = computed(() => props.user?.role === "admin");
         <aside v-if="mobile && !collapsed" class="agent-sidebar mobile">
           <div class="sidebar-header">
             <AgentSwitcher
-              v-if="currentAgentSlug"
+              v-if="currentAgentSlug && loggedIn"
               :current-slug="currentAgentSlug"
               @switch="emit('switchAgent', $event)"
             />
diff --git a/app/pages/chat/[agentSlug]/index.vue b/app/pages/chat/[agentSlug]/index.vue
index 94ea3ca..8e260a1 100644
--- a/app/pages/chat/[agentSlug]/index.vue
+++ b/app/pages/chat/[agentSlug]/index.vue
@@ -282,6 +282,18 @@ async function handleLogout() {
 }
 
 onMounted(async () => {
+  if (!auth.loggedIn.value) {
+    try {
+      const res = await $fetch<{ code: number; data: { slug: string } }>("/api/agents/default-agent");
+      const defaultSlug = res.data?.slug;
+      if (defaultSlug && defaultSlug !== agentSlug.value) {
+        navigateTo(`/chat/${defaultSlug}`, { replace: true });
+        return;
+      }
+    } catch {
+      // ignore
+    }
+  }
   await Promise.all([sessions.init(), loadModels(), loadSystemPrompt(), loadUserConfig()]);
 });
 </script>