Fetch checklist item by ID

Returns the full details of a single checklist item, including its title, notes, due date, checked state, assigned staff, and the type/status of the record its checklist is attached to.

Visibility is inherited from the parent checklist — see the Checklists tag overview for details.

Required permission: assigned_event_read (when the authenticated user is assigned to the item's checklist's event) or unassigned_event_read (otherwise). Items on user-checklists (personal task lists) are only visible to their owner.