diff --git a/mini_agent/agent.py b/mini_agent/agent.py
index b7d7feab..c84ba882 100644
--- a/mini_agent/agent.py
+++ b/mini_agent/agent.py
@@ -460,7 +460,10 @@ async def run(self, cancel_event: Optional[asyncio.Event] = None) -> str:
                 else:
                     try:
                         tool = self.tools[function_name]
-                        result = await tool.execute(**arguments)
+                        # Filter arguments to only include parameters defined in tool schema
+                        valid_params = tool.parameters.get('properties', {}).keys()
+                        filtered_args = {k: v for k, v in arguments.items() if k in valid_params}
+                        result = await tool.execute(**filtered_args)
                     except Exception as e:
                         # Catch all exceptions during tool execution, convert to failed ToolResult
                         import traceback