Update agent.py

agent.py

@@ -6,7 +6,7 @@ from langgraph.prebuilt import ToolNode
 from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint, HuggingFaceEmbeddings
 from langchain_community.vectorstores import SupabaseVectorStore
 from langchain_core.messages import HumanMessage
-from langchain.tools.retriever import create_retriever_tool
+from langchain_core.tools.retriever import create_retriever_tool
 from supabase.client import Client, create_client
 from utils import load_prompt
 from tools import calculator, duck_web_search, wiki_search, arxiv_search