> ## Documentation Index
> Fetch the complete documentation index at: https://relevanceai-docs-tsp-1437.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# '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](/build/tools/tool-steps/slack/send-message) step to update a message in place — for example, to show progress as a multi-step task completes.

<Note>You can learn more about the Slack integration [here](/integrations/popular-integrations/slack).</Note>

<Warning>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.</Warning>

## 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](https://api.slack.com/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](/build/tools/tool-steps/slack/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.

<Accordion title="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.
</Accordion>