Angular Security Agent Skill
Harden Angular apps against XSS, CSP violations, and unauthorized access. Use when implementing XSS protection, Content Security Policy, or auth guards in Angular.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/HoangNguyen0403/agent-skills-standard --skill angular-securityWhat comes with it
4 861 bytes besides the instructionThe instruction itself
8 sections, as written by the authorSecurity
Priority: P0 (CRITICAL)
Principles
- XSS Prevention: Angular sanitizes interpolated values by default — {{ userInput }} safe. NOT use
innerHTMLunless absolutely necessary (e.g., trusted static CMS content). For user-generated content, display as text with {{ content }} — never as HTML. - Trusted HTML APIs: Mark HTML as trusted only for content you control (e.g., vetted CMS headers). Never mark user-provided data as trusted. Prefer DomSanitizer.sanitize(SecurityContext.HTML, content) and review every trust-marking call as a potential XSS vector.
- Route Guards: Protect all sensitive routes with functional CanActivateFn (e.g., inject(Router).createUrlTree(['/login'])). Apply with canActivate: [authGuard].
Guidelines
- CSP: Configure CSP headers on server (not in Angular source). Use nonce-based CSP with script-src 'nonce-{nonce}' and avoid unsafe-inline/unsafe-eval.
- HTTP: Use Interceptors to attach secure tokens. Use HttpOnly cookies managed by server — not localStorage or sessionStorage because they accessible via XSS.
- Secrets: Never store API keys or secrets in Angular source code or bundle.
Anti-Patterns
- No trust-marking on user input: Trust Angular's sanitization; reserve trusted HTML APIs for verified static content only.
- No localStorage for tokens: Use HttpOnly cookies via interceptors for auth tokens.
- No secrets in source: Never embed API keys or secrets in Angular bundle code.
References
- Security Best Practices
- common/security-standards
CSP and secret checklist
- Use a server-generated, per-response nonce in
script-src 'nonce-{nonce}'; do not use a static nonce. - Keep controlled provenance explicit: trust-mark only controlled and verified or vetted static CMS content.
- Do not put API keys or other secrets in the compiled bundle.
Canonical response anchors
- Additional task-grounded exact anchors: {{ content }}
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How to use it
Take hoangnguyen0403/angular-security from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.