mcp-dice

mcp-dice: A MCP Server for Rolling Dice

screenshot

A Model Context Protocol (MCP) server that enables Large Language Models (LLMs) to roll dice. It accepts standard dice notation (e.g., 1d20) and returns both individual rolls and their sum.

Features

Supports standard dice notation (e.g., 1d20, 3d6, 2d8+1)
Returns both individual rolls and the total sum
Easy integration with Claude Desktop
Compatible with MCP Inspector for debugging

Installation

Installing via Smithery

To install Dice Roller for Claude Desktop automatically via Smithery:

npx @smithery/cli install mcp-dice --client claude

Make uv available: https://docs.astral.sh/uv/getting-started/installation/

Usage

Basic Command Line Usage

# Using uvx
uvx mcp-dice

Input Format

The server accepts a JSON object with a notation field:

{
  "notation": "2d6+3"
}

Example responses:

{
  "rolls": [
    3,
    1
  ],
  "sum": 4,
  "modifier": 3,
  "total": 7,
  "notation": "2d6+3",
  "timestamp": "2024-12-03T16:36:38.926452"
}

Claude Desktop Configuration

Location

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%/Claude/claude_desktop_config.json

Examples

{
  "mcpServers": {
    "dice": {
      "command": "uvx",
      "args": ["mcp-dice"]
    }
  }
}

{
  "mcpServers": {
    "dice": {
      "command": "wsl",
      "args": [
        "-e",
        "zsh",
        "-lc",
        "uvx mcp-dice"
      ]
    }
  }
}

Note: Replace zsh with your login shell.

Development and Debugging

Installing Development Dependencies

# Clone the repository
git clone https://github.com/yourusername/mcp-dice
cd mcp-dice

# Install development dependencies
uv pip install -e ".[dev]"

Running Tests

uv run pytest

Using MCP Inspector

The MCP Inspector is a useful tool for debugging your MCP server. Install and run it using npm:

npx @modelcontextprotocol/inspector uvx mcp-dice

Claude Desktop Configuration for Development

{
  "mcpServers": {
    "dice": {
      "command": "uv",
      "args": [
        "run",
        "--directory",
        "path/to/mcp-dice-repo",
        "mcp-dice"
      ]
    }
  }
}

Note: Replace path/to/mcp-dice-repo with the path to the repository on your filesystem.

{
  "mcpServers": {
    "dice": {
      "command": "wsl",
      "args": [
        "-e",
        "zsh",
        "-lc",
        "uv run --directory path/to/mcp-dice-repo mcp-dice"
      ]
    }
  }
}

Note: Replace zsh with your login shell. Also, replace path/to/mcp-dice-repo with the path to the repository on your WSL filesystem.

Install Server

HTTP connection URL

security – no known vulnerabilities

license - permissive license

quality - confirmed to work

How are these scores calculated?

local-only server

The server can only run on the client's local machine because it depends on local resources.

Tools

roll_dice

A MCP server enabling LLMs to roll dice

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