RubyGemsにはプラグインの仕組みがあって、以下のようにプラグインを検出してロードするとのこと。 Gem の rdoc より。 RubyGems Plugins As of RubyGems 1.3.2, RubyGems will load plugins installed in gems or $LOAD_PATH. Plugins must be named ‘rubygems_plugin’ are discovered via Gem::find_files then loaded. Take care when implementing a plugin as your plugin file may be loaded multiple times if multiple versions of your gem are installed. For an exampl