mcp-rand/build/handlers/roll-dice.handler.js

MCP server providing random generation utilities including UUID, numbers, strings, passwords, Gaussian distribution, dice rolling, and card drawing

import { McpError, ErrorCode } from '@modelcontextprotocol/sdk/types.js';
export const toolSpec = {
    name: 'roll_dice',
    description: 'Roll a set of dice using standard dice notation (e.g., "2d6" for two six-sided dice, "3d6+5" for three six-sided dice plus 5)',
    inputSchema: {
        type: 'object',
        properties: {
            dice: {
                type: 'array',
                items: {
                    type: 'string',
                    description: 'Dice notation (e.g., "2d6", "1d20", "4d4")'
                },
                description: 'Array of dice to roll'
            }
        },
        required: ['dice']
    }
};
function parseDiceNotation(notation) {
    const match = notation.toLowerCase().match(/^(\d+)d(\d+)([+-]\d+)?$/);
    if (!match) {
        throw new McpError(ErrorCode.InvalidParams, 'Invalid dice notation');
    }
    const count = parseInt(match[1]);
    const sides = parseInt(match[2]);
    const modifier = match[3] ? parseInt(match[3]) : 0; // If no modifier, default to 0
    if (count <= 0) {
        throw new McpError(ErrorCode.InvalidParams, 'Number of dice must be positive');
    }
    if (sides <= 0) {
        throw new McpError(ErrorCode.InvalidParams, 'Die size must be positive');
    }
    return { count, sides, modifier };
}
function rollDie(sides) {
    return Math.floor(Math.random() * sides) + 1;
}
function rollDiceSet(notation) {
    const { count, sides, modifier } = parseDiceNotation(notation);
    const rolls = Array.from({ length: count }, () => rollDie(sides));
    const rollTotal = rolls.reduce((a, b) => a + b, 0);
    const total = rollTotal + modifier;
    return {
        dice: notation,
        rolls,
        modifier,
        total
    };
}
export const rollDiceHandler = async (request) => {
    const args = request.params.arguments;
    if (!args.dice || args.dice.length === 0) {
        throw new McpError(ErrorCode.InvalidParams, 'Must specify at least one die to roll');
    }
    const results = args.dice.map(dice => rollDiceSet(dice));
    return {
        content: [
            {
                type: 'text',
                text: JSON.stringify(results, null, 2)
            }
        ]
    };
};
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