MCP Ruby
An implementation of the Model Context Protocol in Ruby.
What is MCP Ruby?
MCP Ruby is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to implementation of the model context protocol in ruby.
An implementation of the Model Context Protocol in Ruby.
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- An implementation of the Model Context Protocol in Ruby.
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx model-context-protocol-rbConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use MCP Ruby
model-context-protocol-rb is a Ruby gem that provides a full server-side implementation of the Model Context Protocol, enabling Ruby developers to build MCP-compatible servers that expose tools, resources, prompts, and resource templates to AI clients. It supports both stdio and Streamable HTTP transports, includes list-change notifications, pagination, cancellation, and progress reporting, making it a production-ready foundation for custom Ruby MCP integrations. Ruby teams use it to wrap internal APIs, databases, or services so that AI assistants can call them natively.
Prerequisites
- Ruby 2.7 or higher with Bundler installed
- Redis instance if using the HTTP transport (not required for stdio)
- Basic familiarity with Ruby gem development
- An MCP-compatible client such as Claude Desktop or Claude Code to test the server
Add the gem to your project
Add model-context-protocol-rb to your Gemfile, then run bundle install to install it along with its dependencies.
# In Gemfile:
gem 'model-context-protocol-rb'
# Then install:
bundle installDefine a Tool class
Create a Ruby class that inherits from ModelContextProtocol::Tool (or follows the gem's tool interface) and implements the call method with the logic your tool should execute.
class GreetTool < ModelContextProtocol::Tool
description "Greet a user by name"
argument :name, String, required: true, description: "User's name"
def call(name:)
"Hello, #{name}!"
end
endBoot the server with stdio transport
Use the with_stdio_transport helper to start the server. This is the simplest transport and works with all MCP clients that use standard input/output.
ModelContextProtocol::Server.with_stdio_transport do |config|
config.name = "my-ruby-mcp-server"
config.version = "1.0.0"
config.registry do
tools { register GreetTool }
end
endSet REDIS_URL if using HTTP transport
For Streamable HTTP transport (recommended for production deployments), start a Redis instance and set the REDIS_URL environment variable before starting the server.
export REDIS_URL=redis://localhost:6379/0Configure your MCP client
Point your MCP client at the Ruby script that boots the server. The command should be the Ruby interpreter followed by the path to your server entry point.
MCP Ruby Examples
Client configuration
Example claude_desktop_config.json entry to launch a Ruby MCP server script via the Ruby interpreter.
{
"mcpServers": {
"my-ruby-server": {
"command": "ruby",
"args": ["/absolute/path/to/server.rb"],
"env": {
"REDIS_URL": "redis://localhost:6379/0"
}
}
}
}Prompts to try
Once your Ruby MCP server exposes tools, resources, or prompts, AI clients can call them naturally.
- "Call the greet tool with name 'Alice'"
- "List all available tools on the Ruby MCP server"
- "Fetch the resource at config://app-settings from the Ruby server"
- "Use the summarize_report prompt with the latest_report resource"Troubleshooting MCP Ruby
LoadError: cannot load such file — model-context-protocol-rb
Run 'bundle install' in the project directory to ensure the gem is installed. If installing globally, run 'gem install model-context-protocol-rb' and confirm the gem is in your Ruby load path.
HTTP transport fails to start with a Redis connection error
Start a local Redis instance ('redis-server') and set REDIS_URL=redis://localhost:6379/0 before launching the server. Redis is only required for the HTTP/SSE transport; stdio transport works without it.
MCP client reports the server disconnected immediately after launch
Check that the Ruby script calls with_stdio_transport (or the appropriate transport helper) at the top level and does not exit early. Add basic error logging to $stderr to capture any Ruby exceptions at startup.
Frequently Asked Questions about MCP Ruby
What is MCP Ruby?
MCP Ruby is a Model Context Protocol (MCP) server that implementation of the model context protocol in ruby. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install MCP Ruby?
Follow the installation instructions on the MCP Ruby GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with MCP Ruby?
MCP Ruby works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is MCP Ruby free to use?
Yes, MCP Ruby is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
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