Roman Numeral Math Skill

Overview

`roman1` and `roman2` are uppercased and then validated against the canonical pattern for numerals from I to MMMCMXCIX: no symbol repeated more than three times in a row and only the six standard subtractive pairs (IV, IX, XL, XC, CD, CM). Forms such as IIII, IC or VV fail with a 400 that names the bad numeral, so both operands are always between 1 and 3999. Each is converted to an integer by a left-to-right scan that subtracts a smaller symbol placed before a larger one.

`operation` is one of `add` (the default), `subtract`, `multiply` or `divide`, case-insensitive. Division is integer division rounded down and the remainder is discarded, so XX divided by III returns VI. The integer result is then converted back greedily from the largest value down.

Roman numerals have no zero, no negatives and, in standard form, nothing above 3999. A subtraction that comes to zero or less, or a product or sum above 3999, returns a 400 with a message explaining which limit was hit, rather than a partial result.

On success, `result_number` and `result_roman` hold the answer. `equation_numeric` and `equation_roman` write out the whole calculation with the operators +, -, × and ÷, using the numerals as you sent them after uppercasing. `roman1_value` and `roman2_value` are the parsed operands, which is a convenient way to show a learner what each numeral means.

Live Test Roman Numeral Math Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as RomanNumeralMathSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

Tool call

{
  "name": "RomanNumeralMathSkill",
  "arguments": {
    "roman1": "XIV",
    "roman2": "VI"
  }
}

You do not name the tool yourself; the model picks it. Asking about XIV in the terms this skill covers is enough for it to reach for RomanNumeralMathSkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

Argument	Type	Description
`roman1`Required	string	The first Roman numeral
`roman2`Required	string	The second Roman numeral
`operation`Optional	string	Operation to perform `addsubtractmultiplydivide` default add

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

Result

{
  "status": "ok",
  "error": null,
  "data": {
    "roman1": "XIV",
    "roman2": "VI",
    "roman1_value": 14,
    "roman2_value": 6,
    "operation": "add",
    "result_number": 20,
    "result_roman": "XX",
    "equation_numeric": "14 + 6 = 20",
    "equation_roman": "XIV + VI = XX"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`roman1`	string	`XIV`	First operand as it was supplied, in Roman numerals
`roman2`	string	`VI`	Second operand as it was supplied, in Roman numerals
`roman1_value`	number	`14`	First operand converted to a number
`roman2_value`	number	`6`	Second operand converted to a number
`operation`	string	`add`	The arithmetic operation that was applied
`result_number`	number	`20`	Result of the operation as a number
`result_roman`	string	`XX`	Result of the operation in Roman numerals
`equation_numeric`	string	`14 + 6 = 20`	Mathematical equation in numeric format
`equation_roman`	string	`XIV + VI = XX`	Mathematical equation in Roman numeral format

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

Status	What it means
`400` / `422`	The arguments did not validate. The message names the offending one.
`401`	The OAuth session is invalid or expired — reconnect the server.
`403`	Blocked by a key restriction or an IP allow-list. Never a bad identity.
`404`	This skill is not part of VerveKit. Check the catalog.
`429`	Out of credits, or a brief rate limit. The message tells them apart.

A call costs 1 credit each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Educational Tools: Teach Roman numeral arithmetic and ancient mathematics in interactive learning applications
Historical Calculators: Create calculators for historical contexts requiring Roman numeral operations
Puzzle Games: Build mathematical puzzles and games using Roman numeral arithmetic
Format Conversion: Perform calculations while maintaining Roman numeral formatting for specialized applications

Other ways to use Roman Numeral Math Skill

Set up Roman Numeral Math Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Call it as a REST APIOne HTTPS endpoint and an x-api-key header, with SDKs for Node, Python and .NET.APIVerve →Reference →

Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →

Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →