Update app.py

app.py

@@ -262,6 +262,13 @@ class BasicAgent:
         print(f"\n📥 Received question: {repr(question)}")
         messages = [HumanMessage(content=question)]
         response = self.graph.invoke({"messages": messages})
+
+        if not response or "messages" not in response:
+            print("❌ No response or missing 'messages' key from graph.")
+            return "AGENT ERROR: No valid response from graph."
+
+        print("📦 Full graph response:", repr(response))
+
         raw_output = response["messages"][-1].content
         print("📦 Raw LLM output:", repr(raw_output))