diff --git a/nonebot_plugin_llmchat/__init__.py b/nonebot_plugin_llmchat/__init__.py
index d0d5857..0d0feae 100755
--- a/nonebot_plugin_llmchat/__init__.py
+++ b/nonebot_plugin_llmchat/__init__.py
@@ -315,7 +315,7 @@ async def process_messages(group_id: int):
             # 将机器人错过的消息推送给LLM
             past_events_snapshot = list(state.past_events)
             for ev in past_events_snapshot:
-                text_content = ",".join([format_message(ev) for ev in past_events_snapshot])
+                text_content = format_message(ev)
                 content.append({"type": "text", "text": text_content})
 
                 # 将消息中的图片转成 base64
diff --git a/nonebot_plugin_llmchat/mcpclient.py b/nonebot_plugin_llmchat/mcpclient.py
index 9ed9fe0..a6c6ff3 100644
--- a/nonebot_plugin_llmchat/mcpclient.py
+++ b/nonebot_plugin_llmchat/mcpclient.py
@@ -1,5 +1,5 @@
-from contextlib import AsyncExitStack
 import asyncio
+from contextlib import AsyncExitStack
 
 from mcp import ClientSession, StdioServerParameters
 from mcp.client.sse import sse_client
@@ -66,9 +66,7 @@ class MCPClient:
         logger.info(f"正在服务器[{server_name}]上调用工具[{real_tool_name}]")
         session = self.sessions[server_name]
         try:
-            response = await asyncio.wait_for(
-                session.call_tool(real_tool_name, tool_args), timeout=10
-            )
+            response = await asyncio.wait_for(session.call_tool(real_tool_name, tool_args), timeout=10)
         except asyncio.TimeoutError:
             logger.error(f"调用工具[{real_tool_name}]超时")
             return f"调用工具[{real_tool_name}]超时"