mcp-dice

Rolls dice using standard notation (e.g., 1d20) and returns individual rolls and their sum.

GitHub

mcp-dice: A MCP Server for Rolling Dice

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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

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

macOS configuration (local dev) 
{
  "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.

Windows (WSL) configuration (local dev) 
{
  "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.

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