If you're building skills for Claude, this is the manual. It walks through the six-step creation process from gathering concrete examples to packaging the final zip file, with specific emphasis on progressive disclosure (keeping entry points under 200 lines while moving details into reference files). The init and package scripts handle the boilerplate. What's useful here is that it practices what it preaches: the skill itself uses progressive disclosure, splitting its 209-line original into a 150-line entry plus five reference files. The imperative voice guidance and the "start with examples, not abstractions" approach are solid. It's meta, but practically meta, written for people who actually need to ship skills rather than theorize about them.
npx skills add https://github.com/bobmatnyc/claude-mpm-skills --skill skill-creator