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Coin Flip MCP Server

Coin Flip MCP Server

Local
github.com/TeglonLabsGames & Entertainment0Updated 93w ago
Repository

About Coin Flip MCP Server

Coin Flip MCP Server is an MCP server for users who need random coin flips or configurable multi-sided outcomes. It draws randomness from random.org and handles different side counts.

Key features

  1. 01Random outcomes from random.org
  2. 02Configurable number of sides
  3. 03Heads or Tails for two sides
  4. 04Custom result labels for more sides

Use cases

  1. 01Flip a coin for a random choice
  2. 02Generate an outcome across multiple sides

MCP support

It exposes a `flip_coin` tool to MCP clients, with an optional `sides` parameter.

#coin-flip#randomness#mcp-server

Configuration

Local server config is the same for every client. Copy it into your client’s MCP config file.

mcp.json · Universal config
{
  "mcpServers": {
    "coin-flip": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/inspector"
      ]
    }
  }
}
Run commandnpx -y @modelcontextprotocol/inspector

Local servers need a runtime on your machine (e.g. Node.js 18+). Config file locations differ by client; see your client’s docs.

Packages
npm@modelcontextprotocol/inspector

Tools

No tool list yet

Local servers expose tools only once running on your machine, and the maintainer has not provided a tool list.

Details

From the project README

Coin Flip MCP Server

An MCP server that provides true random coin flips using random.org's randomness API. This server demonstrates the Model Context Protocol by providing a tool for generating random outcomes with configurable sides.

Features

Tools
  • flip_coin - Flip a coin with configurable number of sides
    • Optional sides parameter (default: 2)
    • Uses true randomness from random.org
    • Special handling for edge cases (0, 1, or negative sides)
    • For 2 sides: Returns "Heads" or "Tails"
    • For 3 sides: Returns "Heads", "Tails", or "_"
    • For n>3 sides: Returns "It landed on side X"

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

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

{
  "mcpServers": {
    "coin-flip": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-coin-flip"]
    }
  }
}

Example Usage

Once connected to an MCP client like Claude Desktop, you can use natural language to interact with the coin flip tool. For example:

  • "Flip a coin"
  • "Roll a 6-sided die"
  • "Give me a random number between 1 and 20"

The server will use true randomness from random.org to generate the result.

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector:

npx @modelcontextprotocol/inspector node build/index.js

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT

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