List family members. Use the id for appointment attendees. Returns: [{id, name, color?}].

Summarize all lists (no items). Optionally filter by 'shopping' or 'todo'. Returns: [{id, title, type, item_count, completed_count}].

Items in one list. Excludes completed items by default. Returns: [{id, text, status, position?}].

Create a list ('shopping' or 'todo'). Returns: {id, title, type}.

Delete a list. Returns true on success.

Add an item to a list. Returns: {id, text}.

Update an item's text and/or completion status. Pass text, completed, or both. When both are provided the text is updated first then status is updated as a separate request — these are NOT atomic. Returns: {id, text, status}.

Remove items from a list. Returns true on success.

Appointments for one month. Returns: [{id, subject, day, all_day, start?, end?, attendees?, location?, notes?}].

Create a calendar appointment. start and end are ISO datetimes (e.g. '2026-06-15T10:00:00'). For all-day events end may equal start. For attendees, call family_members() first and pass those id values.

Partial-update an appointment. The Cozi PUT semantics replace ALL fields, so this tool first fetches the existing appointment from the (year, month) page and merges your changes — only fields you pass are altered. To switch a timed appointment to all-day pass all_day=true; to switch to timed pass new start/end.

Delete an appointment. Returns true on success.