{"name":"annuity","title":"Annuity Present / Future Value","category":"finance","description":"Compute the present or future value of an ordinary annuity or annuity-due.","price_usd":0.001,"input_schema":{"type":"object","properties":{"mode":{"type":"string","description":"pv or fv","enum":["pv","fv"]},"payment":{"type":"number","description":"Payment per period"},"rate":{"type":"number","description":"Rate per period as a decimal"},"periods":{"type":"integer","description":"Number of periods"},"due":{"type":"boolean","description":"True for annuity-due (default ordinary)"}},"additionalProperties":false,"required":["payment","rate","periods"]}}