Update app.py

app.py

@@ -10,7 +10,7 @@ from pydantic import BaseModel
 from contextlib import asynccontextmanager
 from langchain_mcp_adapters.client import MultiServerMCPClient
 from langchain_google_genai import ChatGoogleGenerativeAI
-from langgraph.prebuilt import create_react_agent
+from langchain.agents import create_agent
 from langchain_core.messages import HumanMessage