On one real-looking workflow it found 22 problems: ubuntu-20.04 removed 2025-04-15, upload-artifact@v3 switched off 2025-01-30, windows-2019 removed 2025-06-30, a disabled ::set-output:: — each with the line and the replacement.

What you get
• 13 dated checks (rules revision 2026.09, 2026-09-11): removed runner images, switched-off artifact actions, actions on retired Node runtimes, archived actions, end-of-life Node versions, moving refs, disabled workflow commands
• Ask Claude “check our GitHub Actions workflows” and it runs the skill on every file in .github/workflows
• Proposes the exact replacement line; edits only when you say so
• Exits 1 on errors, so it can also fail a CI build

Install in 30 seconds
Unzip into ~/.claude/skills/ (all projects) or your-repo/.claude/skills/ (one repo), then ask Claude Code: “check our GitHub Actions workflows”. Needs Node 16+.

What it does not do
It does not run your workflows, call GitHub or read secrets. It reads files on disk and works offline. It only knows the retirements in its rule table.

FAQ
Q: How is this different from asking Claude without the skill?
A: The skill carries a dated rule table and a scanner that reads every file, so Claude quotes the exact date and line instead of guessing from memory.
Q: How do I get the files?
A: After paying, open it in your Whop library: in “Download — github-actions-lint” the lesson “github-actions-lint.zip” has the zip attached.