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trello.onCardCommented matches Trello commentCard actions on one board.
automations/watch-trello-comments.automation.ts
Provide board as an ID, short link, or URL. Optional static account defaults to the project binding.

Trigger data

Returns the shared Trello card event shape, with comment data:
The signal also includes board and card references, an optional list and creator, and the complete Trello webhook under event. Use List comments for the comment object and creation time.