MCP-RB

MCP-RB

一个轻量级 Ruby 框架，可通过类似 Sinatra 的 DSL 实现 MCP（Model Context Protocol）服务。

安装

将以下代码行添加到应用的 Gemfile 中：

gem 'mcp-rb'

用法

下面是创建 MCP 服务的简单示例：

require 'mcp'

name "hello-world"

version "1.0.0"

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

# Define a resource template
resource_template "hello://{user_name}" do
  name "Hello User"
  description "A simple hello user message"
  call { |args| "Hello, #{args[:user_name]}!" }
end

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

# Define a tool with nested arguments
tool "greet_full_name" do
  description "Greet someone by their full name"
  argument :person, required: true, description: "Person to greet" do
    argument :first_name, String, required: false, description: "First name"
    argument :last_name, String, required: false, description: "Last name"
  end
  call do |args|
    "Hello, First: #{args[:person][:first_name]} Last: #{args[:person][:last_name]}!"
  end
end

# Define a tool with an Array argument
tool "group_greeting" do
  description "Greet multiple people at once"
  argument :people, Array, required: true, items: String, description: "People to greet"
  call do |args|
    args[:people].map { |person| "Hello, #{person}!" }.join(", ")
  end
end

支持的规范

参考：MCP 2024-11-05

• 基础协议
  • ping
  • stdio 传输
• 服务端功能
  • 资源
    • resources/read
    • resources/list
    • resources/templates/list
  • 工具
    • tools/list
    • tools/call

目前尚不支持任何能力。

测试

rake test
rake test:unit # run only the unit tests, skipping tests that test a running server

使用 MCP Inspector 测试

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

格式化

bundle exec standardrb --fix

也可以使用 rake 任务：

rake lint      # Run standardrb to check code style
rake lint:fix  # Auto-fix standardrb issues

发布

发布新版本：

1. 更新 lib/mcp/version.rb 中的版本号
2. 更新 CHANGELOG.md
3. 创建 git 标签

git add .
git commit -m "Release vx.y.z"
git tag vx.y.z
git push --tags

1. 构建并推送到 RubyGems

gem build mcp-rb.gemspec
gem push mcp-rb-*.gem

更新日志

参见 CHANGELOG.md