Update app.py

app.py

@@ -61,8 +61,9 @@ class LangGraphAgent:
         print(f"LangGraphAgent processing: {question[:50]}...")
         try:
             messages = [{"role": "user", "content": question}]
-            output = self.graph.invoke({"question": question})
-            return output["messages"][-1].content
+            output = self.graph.invoke({"messages": messages})
+            print("LangGraphAgent result:", output)
+            return output["messages"][-1]["content"]
         except Exception as e:
             print(f"LangGraphAgent error: {e}")
             return "⚠️ Error during LangGraph agent processing."