{"what": "RuleGauge's answer set for the 2025 US federal income tax return, Form 1040: for one return, the total tax under each reading of the official text this service holds (one the text allows is not yet figured, and each answer says so), each with the passage behind it, and where a figure some program gave stands. A tool for an AI agent, over the Model Context Protocol.", "mcp": "https://answers.rulegauge.com/mcp", "how": "POST JSON-RPC 2.0 messages to the MCP address (Streamable HTTP, protocol 2025-06-18); each answer is one JSON body.", "tools": [{"name": "return_schema", "description": "What a tax return is for the answer_set tool: every field, and a blank 2025 return to fill. Call this first."}, {"name": "answer_set", "description": "For one 2025 US federal income tax return (Form 1040, income to total tax, line 24): the total tax under each reading of the IRS's text this tool holds, each with the official passage behind it (one reading the text allows, a way of rounding worksheet products to whole dollars, is not yet figured, and each answer names it), and the points where the text settles a reading with what a program reading it otherwise would compute. It never picks a reading. Use it to check a tax figure, to see whether the official text decides a return, or to cite the passage a figure rests on. Not advice."}, {"name": "place_answer", "description": "Give a 2025 return and the total tax (Form 1040 line 24) some program, person or AI computed for it. Says whether that figure is an answer under the readings of the IRS's text this tool holds; or which settled point or points the program must have read the other way to get it, each with the official passage; or which errors that are not readings give it, alone or together (last year's amounts, a tax or a deduction left out); or that it may come from a method the text leaves to the filer; or that nothing tried gives it. Use it to find out why two tax programs disagree, or to check a figure. Not advice."}], "basis": "Figures are RuleGauge's own computation of the 2025 Form 1040 from income to total tax, which reproduces the IRS's printed Tax Table and worked examples; no credentialed person has validated it. This is not tax advice, and where the official text allows more than one answer none is picked for you."}