Update main.py

main.py

@@ -91,7 +91,7 @@ def format_historical(hist):
 
 class GraphState(TypedDict):
     messages: Annotated[list[AnyMessage], add_messages]
-    documents : List[str]
+    documents : str
 
 def retrieve(state : GraphState):
     documents = format_docs(retriever.invoke(state['messages'][-1].content))