컬렉션과 관련 로직을 전용 클래스로 추출하여 First Class Collection 생성. /first-class-collection으로 호출.
$npx -y skills add msbaek/msbaek-claude-plugins --skill first-class-collectionInstalls into the current project.
Run `npx skills use "https://github.com/msbaek/msbaek-claude-plugins" --skill "msbaek/msbaek-claude-plugins/first-class-collection"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/msbaek/msbaek-claude-plugins" that are relevant to the current task. Run `npx skills add "https://github.com/msbaek/msbaek-claude-plugins"` and select the relevant skills, then follow their instructions.