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Slack Tools

Slack Send Message

Posts a message to a Slack channel, DM, or private group. Provide exactly one visible content mode: `markdown_text` for normal Markdown content, or `blocks` for raw Slack Block Kit layouts. Use `fallback_text` only with `blocks`; it maps to Slack's top-level `text` fallback. Fai…

Write actionRisk level 2 of 5OAuth connection
Use Slack Send Message

Pricing and limits

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Aident LoadoutOpen-CUAK

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Pricing
Free
Unified payment
Not currently supported

Inputs

  • blocksarray
    Use this instead of `markdown_text` only when you need Slack Block Kit capabilities that Markdown cannot express: buttons, approval/reject actions, select menus, checkboxes, radio buttons, date/time pickers, overflow menus, interactive workflow payloads, section accessories, ima…
  • channelstring
    Required
    ID or name of the channel, private group, or IM channel to send the message to. Can be specified as either 'channel' or 'channel_id'. Do NOT include the '#' prefix (e.g., use 'general' not '#general') - any leading '#' will be automatically stripped. For DMs, use the channel ID…
  • thread_tsstring
    Timestamp (`ts`) of an existing message to make this a threaded reply. Use `ts` of the parent message, not another reply. Example: '1476746824.000004'.
  • unfurl_linksboolean
    Enable unfurling of text-based URLs. Defaults `false` for bots, `true` if `as_user` is `true`.
  • unfurl_mediaboolean
    Enable media previews (images, videos) from URLs. Set to `true` (default) to show media previews, `false` to hide them.
  • fallback_textstring
    Optional only when using `blocks`. Maps to Slack's top-level `text` field for notifications, accessibility, search previews, and clients that cannot render blocks. This should be a short plain-text summary of the block content, not another visible message body. Omit it if you wa…
  • markdown_textstring
    Use this for normal LLM-written message content. Pass standard Markdown exactly as written; this tool sends it to Slack's native `markdown_text` argument without converting it to blocks. Do not use this together with `blocks`. Supports Slack's native markdown handling for headin…
  • reply_broadcastboolean
    If `true` for a threaded reply, also posts to main channel. Defaults to `false`.

Observable output

  • data
    Required
    Data from the action execution
  • errorstring
    Error if any occurred during the execution of the action
  • successfulboolean
    Required
    Whether or not the action execution was successful or not

Skills that use this Action

Related use cases

No verified related use cases are linked yet.

Official source

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Skills that use this Action

No published Skills explicitly reference this Action yet.