MCP Ruby Framework

# Gemfile
gem 'mcp-rb'

# Then install:
bundle install

require 'mcp-rb'

resource "hello://world" do
  name "Hello World"
  description "A simple hello world message"
  call { "Hello, World!" }
end

resource_template "hello://{user_name}" do
  call { |args| "Hello, #{args[:user_name]}!" }
end

tool "greet" do
  description "Greet someone by name"
  argument :name, String, required: true
  call { |args| "Hello, #{args[:name]}!" }
end

tool "group_greeting" do
  description "Greet multiple people"
  argument :people, Array, required: true, items: String
  call { |args| args[:people].map { |p| "Hello, #{p}!" }.join(", ") }
end

{
  "mcpServers": {
    "my-ruby-mcp": {
      "command": "ruby",
      "args": ["/absolute/path/to/your_server.rb"]
    }
  }
}

bunx @modelcontextprotocol/inspector $(pwd)/examples/hello_world.rb