'Slack - Update Message' Tool step

Edit a previously sent Slack message in place using Relevance AI

The ‘Slack - Update Message’ Tool step lets you edit the content of a previously sent Slack message. Use it together with the Slack - Send Message step to update a message in place — for example, to show progress as a multi-step task completes.

You can learn more about the Slack integration here.

This integration for Slack was developed by our team and is not affiliated with Slack. Please contact our Support for any questions/queries you may have.

Inputs

Two inputs identify which message to edit:

Input	Required	Description
channel	Yes	The ID of the channel containing the message. Use the channel output from a Send Message step.
ts	Yes	The timestamp identifier of the message to edit. Use the ts output from a Send Message step.

At least one of the following must be provided to set the new content:

Input	Required	Description
text	No	The new plain-text or mrkdwn content for the message
blocks	No	A Block Kit JSON array for richer message layouts
attachments	No	A JSON array of legacy Slack message attachments

Add the ‘Slack - Update Message’ Tool step to your Tool

1. Create a new Tool, then search for the ‘Slack: Update Message’ Tool step
2. Click ‘Expand’ to see the full Tool step
3. Set the Channel field to the channel output from a preceding Send Message step
4. Set the Timestamp field to the ts output from a preceding Send Message step
5. Enter your updated message content in the Text field, or supply a Block Kit JSON array in the Blocks field
6. Click ‘Run step’ to test

Updating a message in place

Wire the ts and channel outputs from a Send Message step directly into this step’s inputs. Each time the Update Message step runs, it overwrites the content of that specific message — no new message is posted to the channel.

Example: updating a progress checklist

This pattern sends one status message at the start of a Tool run and edits it as each task completes, keeping the Slack channel tidy.

Send Message step — posts the initial checklist:

• Message: Task progress:\n⬜ Step 1\n⬜ Step 2\n⬜ Step 3
• Outputs ts and channel for use in subsequent steps

Update Message step (runs after Step 1 completes):

• Channel: reference the channel output from the Send Message step
• Timestamp: reference the ts output from the Send Message step
• Text: Task progress:\n✅ Step 1\n⬜ Step 2\n⬜ Step 3

Update Message step (runs after Step 2 completes):

• Channel: reference the channel output from the Send Message step
• Timestamp: reference the ts output from the Send Message step
• Text: Task progress:\n✅ Step 1\n✅ Step 2\n⬜ Step 3

Each Update Message step edits the same original message rather than posting new replies.