index.tsā¢2.78 kB
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { z } from "zod";
export function registerConvertRomanNumeral(server: McpServer) {
server.registerTool("convert_roman_numerals", {
description: "Convert between Arabic numbers and Roman numerals",
inputSchema: {
input: z.string().describe("Number to convert (Arabic number 1-3999 or Roman numeral)")
},
// VS Code compliance annotations
annotations: {
title: "Convert Roman Numerals",
description: "Convert between Arabic numbers and Roman numerals",
readOnlyHint: false
}
}, async ({ input }) => {
try {
// Auto-detect if input is a number or Roman numeral
const isNumber = /^\d+$/.test(input.trim());
if (isNumber) {
// Convert number to Roman numeral
const num = parseInt(input);
if (isNaN(num) || num < 1 || num > 3999) {
throw new Error("Number must be between 1 and 3999");
}
const values = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1];
const symbols = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"];
let result = "";
let remaining = num;
for (let i = 0; i < values.length; i++) {
while (remaining >= values[i]) {
result += symbols[i];
remaining -= values[i];
}
}
return {
content: [
{
type: "text",
text: `${num} = ${result} in Roman numerals`
}
]
};
} else {
// Convert Roman numeral to number
const roman = input.toUpperCase();
const romanMap: { [key: string]: number } = {
I: 1, V: 5, X: 10, L: 50, C: 100, D: 500, M: 1000
};
let result = 0;
let prev = 0;
for (let i = roman.length - 1; i >= 0; i--) {
const current = romanMap[roman[i]];
if (!current) {
throw new Error(`Invalid Roman numeral character: ${roman[i]}`);
}
if (current < prev) {
result -= current;
} else {
result += current;
}
prev = current;
}
return {
content: [
{
type: "text",
text: `${roman} = ${result} in decimal`
}
]
};
}
} catch (error) {
return {
content: [
{
type: "text",
text: `Error converting Roman numeral: ${error instanceof Error ? error.message : 'Unknown error'}`
}
]
};
}
}
);
}