This one's been deprecated and moved upstream to the official Dart repository, so don't use it anymore. It was originally meant to help migrate your Dart code from the old `package:matcher` expect functions to the newer `package:checks` equivalents, but now you should grab the official version instead. Just run `npx skills add dart-lang/skills --skill dart-migrate-to-checks-package --agent universal` to get the real deal. It's basically a redirect at this point, keeping the old name around so people know where the functionality went.
npx skills add https://github.com/kevmoo/dash_skills --skill dart-checks-migration