Individual skill

permissions-policy

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Use when reviewing HTTP response headers for defense-in-depth security hardening on any web application.

skills/permissions-policy/SKILL.md

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# Set a Permissions-Policy header

A site compromised by XSS that has unrestricted camera and microphone access can silently record the user. Permissions-Policy limits which browser APIs are available, reducing attacker capabilities even after a successful injection.

## Quick Reference

- Use `Permissions-Policy` to disable browser features your site does not use (camera, microphone, geolocation, payment)
- Syntax: `Permissions-Policy: camera=(), microphone=(), geolocation=()` — empty `()` means denied to all
- Previously called `Feature-Policy` — the old syntax is deprecated and only supported in older browsers
- Restricting unused features limits the blast radius if your site is compromised by XSS
- Third-party iframes inherit page restrictions unless you explicitly grant them permissions

## Check