Update agent.py

agent.py

@@ -6,6 +6,7 @@ from langchain_core.agents import AgentAction, AgentFinish
 from langchain.agents import create_react_agent
 from langchain import hub
 from ai_tools import get_tools  # 导入自定义工具集
+import operator 
 
 class AgentState(TypedDict):
     messages: Annotated[Sequence[BaseMessage], operator.add]