Overview
The official Ruby SDK for Model Context Protocol is maintained by Anthropic, providing Ruby developers with tools to build MCP servers and clients using idiomatic Ruby patterns. The SDK supports Rails integration and is designed to work seamlessly with Ruby on Rails applications.
Features
Idiomatic Ruby API
- Ruby Blocks: Leverage Ruby's block syntax
- Metaprogramming: Dynamic tool generation
- Rack Integration: Standard Ruby web interface
- ActiveSupport: Rails utilities and extensions
MCP Server Development
- Tool Definitions: Define tools with Ruby methods
- Resource Management: Expose data as MCP resources
- Prompts: Create prompt templates
- Middleware: Request/response processing chains
Rails Integration
- ActionController: HTTP transport handling
- ActiveRecord: Database resource exposure
- ActionCable: WebSocket support
- ActiveJob: Background processing
Ruby Language Benefits
Developer Productivity
- Concise, readable syntax
- Dynamic typing
- Powerful metaprogramming
- Rich standard library
Web Development
- Rails framework integration
- Sinatra for lightweight servers
- Rack middleware ecosystem
- RESTful API patterns
Testing
- RSpec for behavior-driven development
- Minitest for unit testing
- FactoryBot for test data
- VCR for HTTP mocking
Use Cases
Rails Application Integration
- Add MCP capabilities to existing Rails apps
- Expose ActiveRecord models as MCP resources
- Create AI-powered admin interfaces
- Automate Rails operations
API Wrapper Services
- Build MCP servers wrapping REST APIs
- Transform API responses for AI consumption
- Handle authentication and rate limiting
- Cache expensive API calls
Data Processing
- ETL workflows with MCP triggers
- Data validation and transformation
- Report generation
- Batch processing jobs
Microservices
- Lightweight MCP microservices
- Service mesh integration
- Docker containerization
- Cloud platform deployment
SDK Components
Core Library
- Protocol implementation
- Message handling
- Transport abstraction
- Error management
Server Framework
- Server lifecycle hooks
- Tool execution context
- Resource caching
- Session state management
Client Library
- MCP client implementation
- Connection pooling
- Automatic retries
- Response parsing
Rails Integration Patterns
Model Exposure
mcp_server do
resource 'users' do
User.all
end
tool 'create_user' do |params|
User.create(params)
end
end
Controller Actions
- Expose controller actions as MCP tools
- Leverage existing authorization
- Use Rails routing conventions
- Handle file uploads
Background Jobs
- Trigger ActiveJob jobs via MCP
- Monitor job status
- Retrieve job results
- Handle job failures
Deployment Options
Traditional Rails
- Deploy alongside Rails app
- Share database connections
- Unified authentication
- Single deployment unit
Standalone Service
- Separate Ruby MCP server
- Independent scaling
- Microservices architecture
- API gateway integration
Serverless
- AWS Lambda with Ruby
- Google Cloud Functions
- Azure Functions
- Rack-compatible platforms
RubyGems
- Published as gem for easy installation
- Semantic versioning
- Dependency management
- Regular updates
Documentation
- YARD documentation
- Code examples
- Rails integration guides
- Best practices
Integration
Works with any MCP client. Optimized for Ruby 3.0+ and Rails 7.0+. Compatible with popular Ruby web frameworks including Sinatra and Hanami.
Pricing
Free and open-source under MIT license. Compatible with free and commercial Ruby deployment platforms.
