update

app.py

@@ -3,6 +3,8 @@ import inspect
 import pandas as pd
 import os 
 import gradio as gr
+from langchain_core.messages import SystemMessage, AIMessage, HumanMessage
+from real_agent import call_build
 
 
 # (Keep Constants as is)
@@ -14,11 +16,15 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 class BasicAgent:
     def __init__(self):
         print("BasicAgent initialized.")
+        self.graph = call_build()
+
     def __call__(self, question: str) -> str:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
-        fixed_answer = "This is a default answer."
-        print(f"Agent returning fixed answer: {fixed_answer}")
-        return fixed_answer
+        # Wrap question as a human message.
+        messages = [HumanMessage(content=question)]
+        messages = self.graph.invoke({"messages": messages})
+        answer = messages['messages'][-1].content
+        return answer
 
 def run_and_submit_all( profile: gr.OAuthProfile | None):
     """