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Apply modern web development best practices for security, compatibility, and code quality. Use when asked to "apply best practices", "security audit", "modernize code", "code quality review", or "check for vulnerabilities".
Modern web development standards based on Lighthouse best practices audits. Covers security, browser compatibility, and code quality patterns.
Enforce HTTPS:
<!-- ❌ Mixed content -->
<img src="http://example.com/image.jpg">
<script src="http://cdn.example.com/script.js"></script>
<!-- ✅ HTTPS only -->
<img src="https://example.com/image.jpg">
<script src="https://cdn.example.com/script.js"></script>
<!-- ✅ Protocol-relative (will use page's protocol) -->
<img src="//example.com/image.jpg">
HSTS Header:
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
<!-- Basic CSP via meta tag -->
<meta http-equiv="Content-Security-Policy"
content="default-src 'self';
script-src 'self' https://trusted-cdn.com;
style-src 'self' 'unsafe-inline';
img-src 'self' data: https:;
connect-src 'self' https://api.example.com;">
<!-- Better: HTTP header -->
CSP Header (recommended):
Content-Security-Policy:
default-src 'self';
npx skills add gsd-build/gsd-2 --skill best-practicesHow clear and easy to understand the SKILL.md instructions are, rated from 1 to 5.
Very clear and well structured, with almost no room for misunderstanding.
How directly an agent can act on the SKILL.md instructions, rated from 1 to 5.
Highly actionable with clear, concrete steps that an agent can follow directly.