This one covers the full security stack with concrete examples for each OWASP Top 10 vulnerability. You get parameterized queries for SQL injection, proper escaping for XSS, CSRF token implementation, and authorization middleware patterns. It includes real code showing both the vulnerable version and the fix, which is honestly more useful than most security guides that just tell you what not to do. The password hashing is bcrypt with sensible defaults, rate limiting is included, and there's a solid section on security headers with helmet. If you're doing security reviews or hardening an application, the side-by-side comparisons make it easy to spot problems in your own code.
npx skills add https://github.com/personamanagmentlayer/pcl --skill security-expert