RubyGems MCP server

This MCP server allows you to interact with the RubyGems.org API through the Model Context Protocol, providing convenient access to RubyGems metadata and package information directly from your MCP-compatible client.

Installation

To use the MCP RubyGems server, you'll need to install dependencies and build the server:

npm install
npm run build

For development with automatic rebuilding when files change:

npm run watch

Configuring Your MCP Client

Claude Desktop

To use with Claude Desktop, add the server configuration to your Claude desktop config file:

On MacOS:

~/Library/Application Support/Claude/claude_desktop_config.json

On Windows:

%APPDATA%/Claude/claude_desktop_config.json

Add the following configuration:

{
  "mcpServers": {
    "mcp-server-rubygems": {
      "command": "/path/to/mcp-server-rubygems/build/index.js"
    }
  }
}

Other MCP Clients

For other MCP clients like Cursor or Cline, add the same command path in your client's specific configuration format.

Available Tools

The server provides six tools to interact with the RubyGems.org API:

get_rubygem_info

Retrieves detailed information about a specific RubyGem.

search_rubygems

Searches for RubyGems matching a query string.

get_gem_versions

Gets all available versions of a specified RubyGem.

get_gem_reverse_dependencies

Retrieves a list of gems that depend on a specific RubyGem.

get_owner_gems

Gets all RubyGems owned by a specific user or organization.

get_gem_owners

Retrieves the owners of a specific RubyGem.

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. Use the MCP Inspector to help with debugging:

npm run inspector

This will provide a URL to access debugging tools in your browser, allowing you to monitor the communication between your MCP client and the server.

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "mcp-server-rubygems" '{"command":"/path/to/mcp-server-rubygems/build/index.js"}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "mcp-server-rubygems": {
            "command": "/path/to/mcp-server-rubygems/build/index.js"
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "mcp-server-rubygems": {
            "command": "/path/to/mcp-server-rubygems/build/index.js"
        }
    }
}

3. Restart Claude Desktop for the changes to take effect