List all of the user's task lists (id, title, updated).

Get a single task list by id.

Create a new task list. Emoji in titles render fine in the Google Tasks apps.

Rename a task list.

Delete a task list AND all tasks in it. Irreversible: confirm intent before calling.

List tasks in a task list. By default returns only active (needsAction) tasks; set the show* flags for completed/hidden/deleted ones. Note: tasks completed in the Google Tasks apps become hidden, so harvesting completions needs showCompleted AND showHidden.

Get a single task by id.

Create a task. Due dates are DATE-ONLY in Google Tasks (any time portion is discarded); pass YYYY-MM-DD and it is normalized safely.

Update a task's title, notes, due date, or status (needsAction | completed).

Mark a task completed (shorthand for update_task with status=completed).

Delete a single task.

Reorder a task (position is read-only; this is the only way to reorder), re-parent it as a subtask, or move it to another list via destinationTasklist.

Harvest every change since a timestamp: returns tasks updated after since, grouped per list into completed / active / deleted. Queries with showCompleted+showHidden+showDeleted so completions made in the Google Tasks apps (which become hidden) are not missed. Omit tasklist to sweep every list. The API has no sync tokens; keep your own snapshot and pass its timestamp as since.