Send Mattermost Channel Message: Mattermost action

Inputs

The fields this action accepts.

Every field can be mapped from an upstream trigger, AI step, table row, or hard-coded literal.

Field	Type	Required	Description
Channel ID channel_id	string	Required	Channel ID. Example: abcdef1234567890
Message message	string	Required	Message text (supports Markdown)
Thread Root ID root_id	string	Optional	Post ID to reply to (creates a threaded reply)

Sample request

{
  "channel_id": "e.g. abcdef1234567890",
  "message": "e.g. Build #42 deployed successfully :white_check_mark:",
  "root_id": "e.g. post123abc"
}

Returns

{
  "id": "post123",
  "message": "Build deployed!",
  "create_at": 1700000000000,
  "channel_id": "abcdef123"
}

Use these fields in downstream nodes for routing, logging, or error handling.

FAQ

Questions about Send Mattermost Channel Message.

What does the Send Mattermost Channel Message action do in Mattermost?

Posts a message to a specific channel with optional attachments (Slack-attachment-style cards). The base hook for "external event → post to team channel" workflows.

What inputs does Send Mattermost Channel Message require?

Required: Channel ID, Message. Every input accepts a static value or a variable from any upstream node in your workflow.

Can I use dynamic inputs from earlier workflow nodes?

Yes. Any field on this action can pull values from upstream nodes, whether that's a form response, a trigger payload, an AI output, or a lookup result.

What happens if Mattermost returns an error?

The workflow pauses on the failed node, the error message is captured in the run log, and you can retry the run with one click. Auto-retry policies are configurable per workflow with exponential backoff up to 5 attempts.

Does Send Mattermost Channel Message support batch operations?

Yes. Run Send Mattermost Channel Message inside a Loop node to process arrays. Tiny Command handles Mattermost's rate limits automatically so you don't have to throttle manually.

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