diff --git a/src/gateway/ws.rs b/src/gateway/ws.rs
index 5f5bba1..0cb8d85 100644
--- a/src/gateway/ws.rs
+++ b/src/gateway/ws.rs
@@ -21,6 +21,7 @@ use crate::command::handlers::load_chat_messages::LoadChatMessagesCommandHandler
 use crate::command::handlers::load_task_messages::LoadTaskMessagesCommandHandler;
 use crate::command::handlers::load_topic::LoadTopicCommandHandler;
 use crate::command::handlers::save_session::SaveSessionCommandHandler;
+use crate::command::handlers::save_topic::SaveTopicCommandHandler;
 use crate::command::handlers::session::SessionCommandHandler;
 use crate::command::handlers::stop_execution::StopExecutionCommandHandler;
 use crate::command::handlers::switch_topic::SwitchTopicCommandHandler;
@@ -411,6 +412,12 @@ async fn handle_inbound(
                 state.task_repository.clone(),
                 system_prompt_provider.clone(),
             )));
+            // 注册 save_topic 处理器
+            router.register(Box::new(SaveTopicCommandHandler::new(
+                store.clone(),
+                state.task_repository.clone(),
+                system_prompt_provider.clone(),
+            ).with_session_manager(state.session_manager.clone())));
             // 注册 delete_topic 处理器
             router.register(Box::new(
                 DeleteTopicCommandHandler::new(store.clone())
diff --git a/web/src/components/Chat/MessageBubble.tsx b/web/src/components/Chat/MessageBubble.tsx
index e780ab6..e75d69a 100644
--- a/web/src/components/Chat/MessageBubble.tsx
+++ b/web/src/components/Chat/MessageBubble.tsx
@@ -606,8 +606,9 @@ export function MessageBubble({ message, onNavigateToSubAgent, showThinking = tr
     )
   }
 
-  // 隐藏思考且无实质内容时，不渲染空的助手消息气泡
-  if (!isUser && !isTool && !isMergedTool && !showThinking && !message.content.trim() && message.reasoningContent) {
+  // 隐藏无可见内容的助手消息（无文本，且无思考或思考被关闭）
+  const hasVisibleContent = !!(message.content && message.content.trim()) || (showThinking && message.reasoningContent)
+  if (!isUser && !isTool && !isMergedTool && !hasVisibleContent) {
     return null
   }