CI/CD Audit Skill

Degree of freedom: MIXED — Steps 1–3 judgment [HIGH freedom]; Step 0 gh inventory and Step 4 deletes [LOW freedom — run exactly].

Systematic audit of GitHub Actions workflows to cut the Actions bill (minutes + storage) and speed up CI without losing test coverage or deploy safety. Uses the gh CLI for live billing, run history, and storage data.

How to reason

1. Observe — quote the trigger, runs-on, concurrency, or gh minute/storage number
2. Interpret — billed twice, doomed minutes, or a 10× runner on every push?
3. Classify — double-bill / no-concurrency / expensive-runner / doomed-job / storage / correct
4. Severity — by $ × safety; never score a cut that drops coverage

Worked example