This is a routing skill that figures out which specialized tool to invoke when your iOS build breaks, tests crash, or Xcode acts weird. It covers the full stack: environment issues (zombie processes, stale derived data), SPM conflicts, slow builds, TestFlight crashes, hangs, and code signing. The philosophy is sensible: check environment first before blaming your code, since 90% of mysterious failures are tooling problems. It connects to a bunch of other skills and autonomous agents like build-fixer and crash-analyzer. If you work on iOS and regularly lose 30 minutes to "it builds on my machine" nonsense, this gives you a decision tree to stop guessing.
npx skills add https://github.com/charleswiltgen/axiom --skill axiom-build