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Provides tools for querying information about Ruby gem dependencies in a project's Gemfile, including listing all bundled gems with their versions and details, and retrieving specific gem information.
Enables inspection of Ruby gems from RubyGems.org that are bundled in a project, including versions, descriptions, installation paths, and documentation locations.
BundlerMCP
A Model Context Protocol (MCP) server enabling AI agents to query information about dependencies in a Ruby project's Gemfile. Built with fast-mcp.
Installation
Install the gem and add to the application's Gemfile by executing:
bundle add bundler_mcp --group=development
Usage
Generate the binstub:
bundle binstubs bundler_mcp
Configure your client to execute the binstub. Here are examples that work for Claude and Cursor:
Basic Example (mcp.json)
{
"mcpServers": {
"bundler-mcp": {
"command": "/Users/mike/my_project/bin/bundler_mcp"
}
}
}
Example with logging and explicit Gemfile
{
"mcpServers": {
"bundler-mcp": {
"command": "/Users/mike/my_project/bin/bundler_mcp",
"env": {
"BUNDLER_MCP_LOG_FILE": "/Users/mike/my_project/log/mcp.log",
"BUNDLE_GEMFILE": "/Users/mike/my_project/subdir/Gemfile"
}
}
}
}
Documentation
Available Tools
The server provides two tools for AI agents:
list_project_gems
Lists all bundled Ruby gems with their:
Versions
Descriptions
Installation paths
Top-level documentation locations (e.g.
READMEandCHANGELOG)
get_gem_details
Retrieves detailed information about a specific gem, including:
Version
Description
Installation path
Top-level documentation locations
Source code file locations
Environment Variables
BUNDLE_GEMFILE: Used by Bundler to locate your Gemfile. If you use the binstub method described in the Usage section, this is usually not needed.BUNDLER_MCP_LOG_FILE: Path to log file. Useful for troubleshooting (defaults to no logging)
Development
After checking out the repo, run bin/setup to install dependencies and bundle exec rspec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.
Testing with the MCP Inspector
You can test the server directly using the MCP inspector:
# Basic usage
npx @modelcontextprotocol/inspector ./bin/bundler_mcp
# With logging enabled
BUNDLER_MCP_LOG_FILE=/tmp/log/mcp.log npx @modelcontextprotocol/inspector ./bin/bundler_mcp
# With custom Gemfile
BUNDLE_GEMFILE=./other/Gemfile npx @modelcontextprotocol/inspector ./bin/bundler_mcp
Release Process
To install this gem onto your local machine, run bundle exec rake install. To release a new version:
Update the version number in
version.rbRun
bundle exec rake release
This will:
Create a git tag for the version
Push git commits and the created tag
Push the
.gemfile to rubygems.org
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/subelsky/bundler_mcp.
License
Open source under the terms of the MIT License.
Author
This server cannot be installed
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