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Question

How to retrieve Slack Thread TS from a parent post

  • December 22, 2025
  • 3 replies
  • 14 views

I’m trying to pull the Slack Thread TS value and use it to later reply back in thread when a certain action happens in another system, but apparently the parent post doesn’t always (or ever) provide a Thread TS ID.

This is what Google AI mentioned:

Key Tip: Slack doesn't always provide the Thread TS for the initial message (the parent post), but it does provide it for every reply within that thread, which is what you filter for. This allows you to grab the thread context and post back into it. 

 

In my testing this seems to be correct, as my Zap workflow would create a new message instead of replying in thread. Only when replying in thread did the Zap workflow also correctly reply in thread.

Is there a reliable way to get the Thread TS from the parent post if there’s no thread reply?

Cheers!

3 replies

Sparsh from Automation Jinn
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Hey ​@JCY,

If you want to reply in thread, you have to set thread_ts to be ts of the original message. You can get the original ts from the message and dynamically pass that to thread in Send message action. Hope it helps! 


  • Author
  • New
  • December 22, 2025

Thanks, ​@Sparsh from Automation Jinn!

That worked!


Sparsh from Automation Jinn
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Glad it helped