Lists multiple specific concrete actions: hardening against XSS, CSP violations, and unauthorized access. These are distinct, well-defined security concerns rather than vague abstractions.

Clearly answers both 'what' (harden Angular apps against XSS, CSP violations, unauthorized access) and 'when' (explicit 'Use when implementing XSS protection, Content Security Policy, or auth guards in Angular').

Includes strong natural keywords users would say: 'XSS', 'XSS protection', 'Content Security Policy', 'CSP', 'auth guards', 'Angular'. These are terms developers naturally use when seeking help with Angular security.

Highly distinctive by combining Angular-specific security concerns (XSS, CSP, auth guards). The Angular framework specificity plus the security domain creates a clear niche unlikely to conflict with general security or general Angular skills.

The Anti-Patterns section largely repeats what was already stated in Principles and Guidelines, creating redundancy. The content is otherwise fairly tight but could be tightened by eliminating this duplication.

Provides specific function names, patterns (e.g., DomSanitizer.sanitize, CanActivateFn, nonce-based CSP), and concrete anti-patterns, but lacks executable code examples. A route guard snippet, an interceptor example, or a CSP header example would make this fully actionable.

This is more of a checklist/principles skill than a multi-step workflow, but it still lacks any sequencing or validation steps. For security hardening—a domain where verification matters—there are no audit steps, no 'how to verify CSP is working,' and no feedback loops for checking sanitization.

The skill is concise at the top level with clear references to deeper material (references/security-best-practices.md and common/security-standards). Content is well-organized into Principles, Guidelines, and Anti-Patterns sections with one-level-deep references.