Update app.py

app.py

@@ -39,10 +39,7 @@ def create_langgraph_agent():
     
     # 3. Define the agent's logic (the "agent" node)
     # We create a prompt that tells the model how to use tools
-    prompt = ChatPromptTemplate.from_messages([
-        ("system", "You are a helpful assistant. Use your tools to answer the user's questions."),
-        ("placeholder", "{messages}"),
-    ])
+    prompt = hub.pull("hwchase17/openai-tools-agent")
     agent = create_tool_calling_agent(llm, tools, prompt)
     print("Agent logic created.")