Actionlint

Validate GitHub Actions workflow files (.github/workflows/*.yml) for syntax errors, invalid references, expression mistakes, and security issues. Catches errors that would otherwise only surface at runtime.

What this skill does

1. Checks if actionlint is available; guides installation if missing.
2. Detects project-specific .actionlintrc.yaml or falls back to a sensible default config.
3. Validates workflow files for syntax, action references, expressions, shell scripts, and security issues.
4. Reports errors with specific rule categories and fixes.

Installation check