ActionTrelloUpdated September 2026

How do I add a comment to a Trello card?

Short answer: You can add comment in Trello by hand from its own interface, but it won’t repeat itself. On TinyCommand, add the Trello Add Comment action to a workflow, map its 2 inputs from any upstream app, and it runs automatically every time the trigger fires. No code, and a free tier to start.

Add Comment in Trello — start free All 21 Trello actions

Add Comment in Trello — start free

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.

Triggered by

Apps that pair well as the trigger for Add Comment.

Any of these apps can fire this action as part of a workflow.

Google Sheets → Trello

2 Google Sheets triggers

HubSpot → Trello

18 HubSpot triggers

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 run history shows the failed step with its input and the error message Trello returned, so you can fix the input and run the workflow again. Automatic retries are built into HTTP steps only, where you can also set your own retry count and delay.

Does Add Comment support batch operations?

Run Add Comment inside a loop to process each item in an array. TinyCommand does not throttle calls for you, so for large arrays add a Delay step if you need to stay within Trello's rate limits.

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