Slack tool doesn't set threads_ts even Message_Timestamp_to_Reply_To is set by agent

Questions
1

Describe the problem/error/question

Slack tool doesn’t set threads_ts even Message_Timestamp_to_Reply_To isn’t empty

I’m using the Slack tool with an AI agent. I enabled Reply to Thread, and the AI agent is attempting to set the correct value in Threads.ts, but the thread timestamp isn’t reflected in the output.

Please share your workflow

Screenshot 2025-10-26 at 13.32.49
Screenshot 2025-10-26 at 13.32.491228×1233 130 KB

Information on your n8n setup

  • n8n version: 1.116.1
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app): n8n cloud
  • Operating system: MacOS
2

Pressing the edit button causes an error, so I’ll add this post.

From the screenshot, the AI agent is attempting to specify the correct parent message’s timestamp via Message_Timestamp_to_Reply_to, but the SlackTool response does not set the thread_ts for the posted message.