Update app.py

app.py

@@ -5,6 +5,7 @@ from llama_index.embeddings.huggingface import HuggingFaceEmbedding
 from llama_index.core import  VectorStoreIndex
 from langchain_groq import ChatGroq
 from langchain.tools import BaseTool, StructuredTool, tool
+from pydantic import BaseModel
 from langchain_community.tools.tavily_search import TavilySearchResults
 from typing import TypedDict ,Annotated
 from langchain_core.runnables import RunnablePassthrough