{"name":"tax_bracket","title":"Progressive Tax Calculator","category":"finance","description":"Total tax, effective and marginal rate from a marginal bracket table.","price_usd":0.002,"input_schema":{"type":"object","properties":{"income":{"type":"number","description":"Taxable income"},"brackets":{"type":"array","description":"Marginal brackets: [{up_to: number|null, rate: decimal}, ...]"}},"additionalProperties":false,"required":["income","brackets"]}}