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by Trello

Add a comment to a card

Adds a comment with the text you pass to a card and returns the comment action.

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Updated Sep 27, 2026Available asAPI

add-card-comment.md

Add a comment to a card

Adds a comment with the text you pass to a card and returns the comment action.

Set up

Use the first option your agent supports.

API (official)

Before doing anything else, make one read-only call to confirm access.

Rules

  • Ask the user before anything that sends messages, costs money, or changes data.
  • Never print API keys.

Built from these files in the repository

The layout and the rules come from lib/catalog/render-markdown.ts, the set-up wording from lib/catalog/render-access.ts.

Ways in

RouteSourceCallRequiredDocs
APIOfficialPOST /cards/{id}/actions/commentsOAuthDocs

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