Update agent.py

agent.py

@@ -7,7 +7,7 @@ from langchain_huggingface import HuggingFaceEndpoint, ChatHuggingFace
 from tools import extract_text
 from langchain_community.tools import DuckDuckGoSearchRun
 from langchain_openai import ChatOpenAI
-from typing import TypedDict,Annotated
+from typing import TypedDict, Annotated, Optional
 
 
 class AgentState(TypedDict):