update

app/core/runner/thread_runner.py

@@ -294,7 +294,7 @@ class ThreadRunner:
                         completed=not external_tool_call_dict,
                     )
                     self.event_handler.pub_message_delta_tool(
-                        message_id=llm_callback_handler.message.id,
+                        message_id=new_run_step.id,
                         index=0,
                         content=json.dumps(tool_calls_with_outputs)
                     )