How to create canvas in Slack

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
Canvas Title title	string	Required	Title shown at the top of the Canvas.
Content (Markdown) markdown	string	Required	Canvas body in Markdown.
Share to Channel (optional) channel	string	Optional	Slack channel ID (starts with C for public, G for private group, D for DM). Find via List Channels. Not the channel name with #.

Sample request

{
  "title": "{{trigger.title}}",
  "markdown": "{{trigger.markdown}}",
  "channel": "e.g. C0123456789"
}

Returns

{
  "ok": true,
  "raw": {},
  "canvas_id": "F0123ABC"
}

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

FAQ

Questions about Create Canvas.

What does the Create Canvas action do in Slack?

Creates a new Slack Canvas, a rich-text doc that can be shared in channels. Useful for templated onboarding docs or recurring meeting agendas.

What inputs does Create Canvas require?

Required: Canvas Title, Content (Markdown). 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 Slack 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 Create Canvas support batch operations?

Yes. Run Create Canvas inside a Loop node to process arrays. TinyCommand handles Slack's rate limits automatically so you don't have to throttle manually.

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