Update app.py

app.py

@@ -5,7 +5,8 @@ from langgraph.prebuilt import ToolExecutor,ToolInvocation
 from typing import TypedDict, Annotated, Sequence
 import operator
 from langchain_core.messages import BaseMessage,FunctionMessage,HumanMessage,AIMessage
-from langchain.tools import ShellTool,tool
+
+from langchain_community.tools import ShellTool,tool
 import json
 import os
 import gradio as gr