Update app.py

app.py

@@ -56,7 +56,15 @@ class BasicAgent:
         
     def __call__(self, question: str) -> str:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
-        answer = chat.invoke({"messages": [{"role": "user", "content": question}]})
+
+        messages = [
+            SystemMessage(content="You're a helpful assistant"),
+            HumanMessage(
+                content=question
+            ),
+        ]
+
+        answer = chat.invoke(messages)
         print(f"Agent returning answer: {answer}")
         return answer