If you're building skills for Claude and want to understand the format, this is the meta-skill that documents how to do it. It explains what skills are (modular packages that give Claude specialized workflows and domain knowledge), what they should contain, and the principles behind effective ones. The irony is that at 125 installs with passing security audits, it's clearly useful reference material, but you're mostly getting conceptual guidance rather than scaffolding tools or templates. Think of it as the style guide you read before writing your first skill, not a generator that writes one for you.
npx skills add https://github.com/vercel-labs/portless --skill skill-creator