What is Mcp Rand

mcp-rand is a Model Context Protocol (MCP) server that provides various utilities for random generation, including UUIDs, numbers, strings, passwords, Gaussian distributions, dice rolling, and card drawing.

Use cases

Use cases for mcp-rand include generating unique identifiers (UUIDs) for database entries, creating random passwords for user accounts, simulating dice rolls in tabletop games, and generating random strings for testing purposes.

How to use

To use mcp-rand, install it via npm with the command ‘npm install mcp-rand’ or globally with ‘npm install -g mcp-rand’. After installation, you can utilize its various random generation functions in your application.

Key features

Key features of mcp-rand include UUID generation, random number generation within a specified range, Gaussian random number generation, random string generation with configurable character sets, strong password generation, and a dice roller that supports standard notation.

Where to use

mcp-rand can be used in various fields such as software development, game development, security applications, and any scenario requiring random data generation.

MCP Rand

A Model Context Protocol (MCP) server providing various random generation utilities, including UUID, numbers, strings, passwords, Gaussian distribution, dice rolling, and card drawing.

Installation

npm install mcp-rand

Or install globally:

npm install -g mcp-rand

Features

UUID Generator

• Generates RFC 4122 version 4 UUIDs
• Uses Node’s native crypto module for secure random generation
• No parameters required

Random Number Generator

• Generates random numbers within a specified range
• Configurable minimum and maximum values (inclusive)
• Defaults to range 0-100 if no parameters provided

Gaussian Random Generator

• Generates random numbers following a Gaussian (normal) distribution
• Normalized to range 0-1
• No parameters required

Random String Generator

• Generates random strings with configurable length and character sets
• Supports multiple character sets:
  • alphanumeric (default): A-Z, a-z, 0-9
  • numeric: 0-9
  • lowercase: a-z
  • uppercase: A-Z
  • special: !@#$%^&*()_±=[]{};'"\|,.<>/?
• Configurable string length (defaults to 10)

Password Generator

• Generates strong passwords with a mix of character types
• Ensures at least one character from each type (uppercase, lowercase, numbers, special)
• Configurable length (minimum 8, default 16)
• WARNING: While passwords are generated locally, it’s recommended to use a dedicated password manager

Dice Roller

• Roll multiple dice using standard dice notation
• Supports notation like “2d6” (two six-sided dice), “1d20” (one twenty-sided die)
• Returns individual rolls and total for each set of dice
• Can roll multiple different dice sets at once (e.g., “2d6”, “1d20”, “4d4”)

Card Drawer

• Draw cards from a standard 52-card deck
• Maintains deck state between draws using base64 encoding
• Returns drawn cards and remaining deck state
• Supports drawing any number of cards up to the deck size
• Properly shuffles available cards before each draw

Usage

As a CLI Tool

npx mcp-rand

Integration with MCP Clients

Add to your MCP client configuration:

{
  "mcpServers": {
    "mcp-rand": {
      "command": "node",
      "args": [
        "path/to/mcp-rand/build/index.js"
      ],
      "disabled": false,
      "alwaysAllow": []
    }
  }
}

Example Usage

// Generate UUID
const uuid = await client.callTool('generate_uuid', {});
console.log(uuid); // e.g., "550e8400-e29b-41d4-a716-446655440000"

// Generate random number
const number = await client.callTool('generate_random_number', {
  min: 1,
  max: 100
});
console.log(number); // e.g., 42

// Generate Gaussian random number
const gaussian = await client.callTool('generate_gaussian', {});
console.log(gaussian); // e.g., 0.6827

// Generate random string
const string = await client.callTool('generate_string', {
  length: 15,
  charset: 'alphanumeric'
});
console.log(string); // e.g., "aB9cD8eF7gH6iJ5"

// Generate password
const password = await client.callTool('generate_password', {
  length: 20
});
console.log(password); // e.g., "aB9#cD8$eF7@gH6*iJ5"

// Roll dice
const rolls = await client.callTool('roll_dice', {
  dice: ['2d6', '1d20', '4d4']
});
console.log(rolls);
/* Output example:
[
  {
    "dice": "2d6",
    "rolls": [3, 1],
    "total": 4
  },
  {
    "dice": "1d20",
    "rolls": [4],
    "total": 4
  },
  {
    "dice": "4d4",
    "rolls": [2, 3, 2, 3],
    "total": 10
  }
]
*/

// Draw cards
const draw1 = await client.callTool('draw_cards', {
  count: 5
});
console.log(draw1);
/* Output example:
{
  "drawnCards": [
    { "suit": "hearts", "value": "A" },
    { "suit": "diamonds", "value": "7" },
    { "suit": "clubs", "value": "K" },
    { "suit": "spades", "value": "2" },
    { "suit": "hearts", "value": "10" }
  ],
  "remainingCount": 47,
  "deckState": "t//+///bDw=="
}
*/

// Draw more cards using previous deck state
const draw2 = await client.callTool('draw_cards', {
  count: 3,
  deckState: draw1.deckState
});
console.log(draw2);
/* Output example:
{
  "drawnCards": [
    { "suit": "diamonds", "value": "Q" },
    { "suit": "clubs", "value": "5" },
    { "suit": "spades", "value": "J" }
  ],
  "remainingCount": 44,
  "deckState": "l//+//zbDw=="
}
*/

Contributing

Please see CONTRIBUTING.md for development setup and guidelines.

License

ISC