Agent node in Chatflow iteration returns Internal Server Error with no details

Discussion
1

Hi, I’m using Dify Cloud and encountered an issue with the Agent node inside an iteration node in Chatflow.

Setup:

  • Dify Cloud version
  • Chatflow application
  • Agent node (ReAct strategy) placed inside an Iteration node
  • Agent has ZhipuAI Web Search tool enabled
  • Query input is a String variable converted from iteration item

Issue:
The Agent node always returns “Internal Server Error” with no additional error details or stack trace. This happens regardless of:

  • Which tools are enabled (even with all tools disabled)
  • What model is used (gpt-4o-mini)
  • What content is passed in the query

Steps to reproduce:

  1. Create a Chatflow
  2. Add an Iteration node
  3. Add an Agent node inside the Iteration node
  4. Run the Agent node test

Expected: Agent executes normally
Actual: Internal Server Error, no details provided

Is this a known issue with Agent nodes inside Iteration nodes on Dify Cloud? Any workaround would be appreciated.