{"name":"tvm","title":"Time Value of Money Solver","category":"finance","description":"Solve for any one of PV, FV, PMT, N, or rate given the other four TVM variables.","price_usd":0.002,"input_schema":{"type":"object","properties":{"solve_for":{"type":"string","description":"Which variable to solve for","enum":["pv","fv","pmt","n","rate"]},"pv":{"type":"number","description":"Present value"},"fv":{"type":"number","description":"Future value (default 0)"},"pmt":{"type":"number","description":"Payment per period"},"n":{"type":"number","description":"Number of periods"},"rate":{"type":"number","description":"Rate per period as a decimal"}},"additionalProperties":false,"required":["solve_for"]}}