Update agent.py

agent.py

@@ -89,7 +89,7 @@ def find_answer(query: str) -> str:
 
 tools = [find_answer]
 
-def build_graph(provider: str = "openai"):
+def build_graph():
     """
     Build a LangGraph where every HumanMessage is handled by find_answe(---),
     and the returned AIMessage contains exactly the stored answer text.