mcp-rb

Overview

MCP-RB is a lightweight Ruby framework that simplifies the creation of MCP servers using a familiar Sinatra-like DSL. It provides a clear and concise way to define both resources and tools, with support for various argument types including nested structures and arrays. The framework actively supports the MCP 2024-11-05 specification, implementing core protocol features like ping, stdio transport, and server capabilities for resources and tools.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• greetname: String

  Greet someone by name

  Try:Greet JohnTry:Say hello to Alice
• greet_full_nameperson: {first_name: String, last_name: String}

  Greet someone by their full name

  Try:Greet John SmithTry:Say hello to Jane Doe
• group_greetingpeople: Array<String>

  Greet multiple people at once

  Try:Greet John, Alice, and BobTry:Say hello to the team

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Installation

gem 'mcp-rb'

bundle install

{
  "mcpServers": {
    "mcp-rb-example": {
      "command": "ruby",
      "args": ["path/to/your/server.rb"]
    }
  }
}

FAQ

What MCP specifications are supported?

The framework supports MCP 2024-11-05 specification, including Base Protocol features (ping, stdio transport) and Server features for resources and tools.

How can I test my MCP server?

You can run unit tests with `rake test` or test with MCP Inspector using `bunx @modelcontextprotocol/inspector $(pwd)/examples/hello_world.rb`.

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