Security Headers Checker

Checks HTTP security response headers:

• HSTS (HTTP Strict Transport Security)
• X-Content-Type-Options
• X-Frame-Options
• X-XSS-Protection
• Content-Security-Policy
• Referrer-Policy
• Permissions-Policy
• Cross-Origin policies

Use builtin_security_headers_checker tool with fields:

• url: URL to check (required)
• headers: (optional) raw HTTP headers to check

Returns analysis of security headers with recommendations.