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trello.updateChecklistItem changes one checklist item through its containing card.
automations/complete-trello-check-item.automation.ts
Provide card and itemId. Provide at least one of name, state: "complete" | "incomplete", position, dueAt, clearDue, dueReminder, or memberId. Dates accept Date or an ISO 8601 timestamp with offset. Reminders are integers of at least -1. clearDue and dueAt are mutually exclusive. Optional 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 instead of reporting the requested advanced update as successful. Name, position, and completion changes remain available on Free Workspace boards. Returns the updated TrelloCheckItem. Trello requires the card because it addresses checklist-item updates through the card resource.