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ActionTrelloUpdated June 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.

FieldTypeRequiredDescription
Card ID
card_id
stringRequiredCard ID. Example: card123
Comment Text
text
stringRequiredComment 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.

Gmail → Trello
1 Gmail triggers
Slack → Trello
13 Slack triggers
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 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. TinyCommand handles Trello's rate limits automatically so you don't have to throttle manually.
More actions

Other Trello actions.

Action
Add Checklist Item
Adds an item to an existing Trello checklist on a card with optional pre-checked state. Used for templated work breakdowns or for capturing follow-ups from a meeting.
Action
Add Label to Card
Adds a label to a Trello card by label ID. Use to tag cards based on their content (e.g. AI classification) or to auto-categorize new work.
Action
Add Member to Card
Assigns a member to a Trello card. Used for AI-driven routing or for auto-adding the on-call person to incoming bugs.
Action
Archive Card
Archives (closes) a Trello card. Hidden from the board but recoverable; the reversible alternative to Delete Card.
Action
Create Board
Creates a new Trello board with name, optional template, and default lists. Useful for templated project provisioning per customer.
Action
Create Card
Creates a new card on a Trello board list with name, description, due date, labels, members, and position. The standard write action for piping forms or tickets into Trello.
Add Comment in Trello — start free