trello.createChecklistItem adds an item with optional assignment, due time, reminder, and completion state.
automations/create-trello-check-item.automation.ts
checklistId and non-empty name. completed defaults to false. position defaults to "bottom" and also accepts "top" or a nonnegative number. Optional dueAt accepts Date or an ISO 8601 timestamp with offset. dueReminder is an integer of at least -1. memberId is a stable member ID. Second argument { account } defaults to the project binding.
Trello’s advanced checklists restrict checklist-item dates, reminders, and member assignments to boards in Standard, Premium, or Enterprise Workspaces. If Trello accepts a request but silently omits one of these fields, the action fails explicitly; a failed create also removes the basic item Trello created. Name, position, and completion state remain available on Free Workspace boards.
Returns Signal<TrelloCheckItem> with stable ID, text, state, position, and nullable date, reminder, and assignee.