Update app.py

app.py

@@ -12,7 +12,7 @@ from langgraph.prebuilt import tools_condition
 from langgraph.graph import StateGraph, START, END
 from langchain_community.tools import DuckDuckGoSearchRun
 from langchain_huggingface import HuggingFaceEndpoint, ChatHuggingFace
-from langchain.chat_models import ChatOpenAI
+from langchain.chat_models import ChatOpenAI, init_chat_model
 
 # (Keep Constants as is)
 # --- Constants ---
@@ -27,16 +27,17 @@ class BasicAgent:
     def __init__(self):
         print("BasicAgent initialized.")
         
-        chat = ChatOpenAI(model="gpt-4-turbo", temperature=0)
+        chat = init_chat_model(model="gpt-4-turbo", temperature=0)
 
         # Set up tools
         search_tool = DuckDuckGoSearchRun()
         tools = [search_tool]
+        chat_with_tools = chat.bind_tools(tools)
         
         # Assistant function (process one step)
         def assistant(state: AgentState):
             return {
-                "messages": [chat.invoke(state["messages"])]
+                "messages": [chat_with_tools.invoke(state["messages"])]
             }
 
         # Create a StateGraph