If you're porting graphics code to Apple's Metal API and hitting the usual suspects (black screens, shader compilation failures, weird colors, crashes during GPU work), this walks you through systematic diagnostics. The first thing it does is make you enable Metal validation, which the author correctly notes takes 30 seconds and saves hours of blind debugging. It's focused on the messy reality of migration work rather than greenfield development. The skill has been installed 166 times and sits in a repo with nearly 1,000 stars, so people are clearly running into these problems often enough that a structured troubleshooting flow is worth having on hand.
npx skills add https://github.com/charleswiltgen/axiom --skill axiom-metal-migration-diag