Add a task to Todoist. Supports natural-language due dates ('tomorrow at 5pm', 'every monday') and a priority of p1 (highest) to p4 (none). Use when the user wants to create a to-do, reminder, or task in Todoist.

List active (incomplete) Todoist tasks. Optionally filter by project name or by a Todoist filter query (e.g. 'today', 'overdue', '@work'). Use when the user asks what's on their list, what's due, or to review tasks.

Mark a Todoist task complete. Pass either the task id, or a piece of the task text to match (e.g. 'milk' to complete 'Buy milk'). Use when the user says they finished or did something.

Update an existing Todoist task — change its text, due date, priority, or description. Identify it by task_id or by a content substring match.

List Todoist projects (their names and ids). Use to see available projects before filing or filtering tasks.