update agent class

app.py

@@ -4,6 +4,8 @@ import requests
 import inspect
 import pandas as pd
 
+from langchain_core.messages import HumanMessage
+
 from agent import build_agent_graph
 # (Keep Constants as is)
 # --- Constants ---
@@ -17,9 +19,13 @@ class MyAgent:
         self.graph = build_agent_graph()
     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
+        print(f"Agent received question (first 50 chars): {question[:50]}...")
+        # Wrap the question in a HumanMessage from langchain_core
+        messages = [HumanMessage(content=question)]
+        messages = self.graph.invoke({"messages": messages})
+        answer = messages['messages'][-1].content
+        print(f"Agent returning fixed answer: {answer}")
+        return answer
 
 def run_and_submit_all( profile: gr.OAuthProfile | None):
     """