Add Comment: Trello 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
Card ID card_id	string	Required	Card ID. Example: card123
Comment Text text	string	Required	Comment Text. Example: Updated the design — ready for review.

Sample request

{
  "card_id": "e.g. card123",
  "text": "e.g. Updated the design — ready for review."
}

Returns

{
  "id": "action123",
  "data": {
    "text": "Updated the design — ready for review."
  },
  "type": "commentCard"
}

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

FAQ

Questions about Add Comment.

What does the Add Comment action do in Trello?

Adds a comment to a Trello card with optional @mentions. Used for automation activity logs, AI summary notes, or status broadcasts.

What inputs does Add Comment require?

Required: Card ID, Comment Text. 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 Trello 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 Add Comment support batch operations?

Yes. Run Add Comment inside a Loop node to process arrays. Tiny Command handles Trello's rate limits automatically so you don't have to throttle manually.

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