diff --git a/agent/logging_handler.py b/agent/logging_handler.py
index 163140f..5d2c196 100644
--- a/agent/logging_handler.py
+++ b/agent/logging_handler.py
@@ -66,7 +66,7 @@ class LoggingCallbackHandler(BaseCallbackHandler):
             tool_name = 'unknown_tool'
         else:
             tool_name = serialized.get('name', 'unknown_tool')
-        self.logger.info(f"🔧 Tool Start - {tool_name} with input: {str(input_str)[:300]}")
+        self.logger.info(f"🔧 Tool Start - {tool_name} with input: {str(input_str)[:600]}")
 
     def on_tool_end(self, output: str, **kwargs: Any) -> None:
         """当工具调用结束时调用"""