Individual skill

checking-http-security-headers

Audit a target's HTTP security headers — CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, and the Cross-Origin trio (COOP, COEP, CORP). Use when: SOC2 / PCI auditor flagged "missing security headers" or a Mozilla Observatory grade is below B, OR you need HSTS preload eligibility for chrome://net-internals. Threshold: any missing required header on production HTML response, HSTS max-age below 31536000s (preload requirement), CSP with 'unsafe-inline' or 'unsafe-eval', X-Frame-Options absent AND CSP frame-ancestors absent (clickjacking), Cache-Control allowing public cache on authenticated endpoint. Trigger with: "audit security headers", "check csp", "hsts check", "header posture".

skills/.curated/checking-http-security-headers/SKILL.md

Source commit 0500b275e963c027f6b410e8c49c0446945c574e

What was checked

Matches the observed repository HEAD

Yes

Scanner rules are current

No

Repository scan complete

No

Skill scan complete

No

Observed behavior

Not checked yet

Last checked

Nov 12, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

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