Update app.py

app.py

@@ -26,8 +26,22 @@ class BasicAgent:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
         messages = [HumanMessage(content=question)]
         result = self.graph.invoke({"messages": messages})
-        answer = result['messages'][-1].content
-        return answer  # kein [14:] mehr nötig!
+        print(f"Graph result: {result}")
+        if not isinstance(result, dict):
+           return "Graph returned an unexpected result format."
+
+        if 'messages' in result:
+           answer = result['messages'][-1].content
+           return answer
+        else:
+          return f"Graph returned: {result} (missing 'messages')"
+        # answer = result['messages'][-1].content
+        # return answer  # kein [14:] mehr nötig!
+        # result = self.graph.invoke({"messages": messages})
+
+
+
+