Plans

Pricing tiers (2x/week, 3x/week, daily, …) — orthogonal to modality.

list_plans

Argument	Type	Required	Notes
limit	number	no	default 50, max 200
offset	number	no	default 0

Ordered by name ascending.

get_plan

Argument	Type	Required
id	uuid	yes

create_plan

Argument	Type	Required	Notes
name	string	yes
weekly_frequency	integer	yes	≥ 1
price	number	yes	≥ 0, BRL

update_plan

Same fields as create_plan, all optional, plus id (required).

delete_plan

Argument	Type	Required
id	uuid	yes

Fails if any contracts row still references this plan.