analyzing-security-headers

This skill analyzes HTTP security headers of a given domain to identify potential vulnerabilities and misconfigurations. It provides a detailed report with a grade, score, and recommendations for improvement. Use this skill when the user asks to "analyze security headers", "check HTTP security", "scan for security vulnerabilities", or requests a "security audit" of a website. It will automatically activate when security-related keywords are used in conjunction with domain names or URLs.

1.16x

Quality

53%

Does it follow best practices?

Impact

94%

1.16x

Average score across 9 eval scenarios

Securityby

Advisory

Suggest reviewing before use

Optimize this skill with Tessl

npx tessl skill review --optimize ./backups/skills-migration-20251108-070147/plugins/security/security-headers-analyzer/skills/security-headers-analyzer/SKILL.md

Evaluation results

94%

11%

Website Security Header Assessment

Structured security report with grade and score

Criteria

Without context

With context

Security grade present

100%

Numeric score present

100%

Missing headers identified

100%

Misconfigured headers identified

100%

70%

Per-header recommendations

100%

HSTS coverage

100%

CSP coverage

100%

Headers checked against best practices

37%

62%

Actionable recommendations

100%

Report covers multiple header types

100%

98%

24%

Pre-Audit HTTP Security Review

HSTS and CSP prioritization in recommendations

Criteria

Without context

With context

HSTS prioritized

85%

100%

Downgrade attack explanation

33%

100%

CSP recommendation present

100%

CSP strictness mentioned

100%

XSS mitigation linked to CSP

100%

Security grade present

62%

100%

Numeric score present

100%

Actionable HSTS fix

100%

Multiple headers assessed

100%

Missing vs misconfigured distinction

16%

66%

100%

Security Header Monitoring Program

Ongoing monitoring and integration recommendations

Criteria

Without context

With context

Regular scan recommendation

100%

Integration with other tools

100%

Security grade present

100%

Numeric score present

100%

Missing headers listed

100%

Actionable immediate fixes

100%

HSTS mentioned

100%

CSP mentioned

100%

Monitoring cadence specificity

100%

Comprehensive header coverage

100%

Regression detection guidance

100%

Merger Security Posture Comparison

Comparative multi-domain security analysis

Criteria

Without context

With context

Grade for domain 1

100%

Score for domain 1

100%

Grade for domain 2

100%

Score for domain 2

100%

HSTS assessed per domain

100%

CSP assessed per domain

100%

Comparative verdict

100%

Per-domain recommendations

100%

HSTS downgrade attack

100%

CSP XSS mitigation

100%

Missing vs present distinction

100%

84%

11%

Web Server Security Header Hardening

Concrete server implementation examples

Criteria

Without context

With context

Security grade present

100%

Numeric score present

100%

HSTS directive example

100%

HSTS listed first or as top priority

Downgrade attack prevention

50%

60%

CSP directive example

100%

CSP strictness guidance

100%

80%

CSP linked to XSS

100%

Multiple header directives

100%

Actionable without further research

100%

Missing vs misconfigured

100%

92%

Third-Party Payment Provider Security Vetting

Vendor security assessment with integration guidance

Criteria

Without context

With context

Security grade present

66%

100%

Numeric score present

100%

HSTS coverage

100%

HSTS downgrade protection

100%

CSP coverage

100%

CSP XSS link

Ongoing monitoring plan

100%

Monitoring frequency specified

100%

Complementary tools mentioned

100%

Missing vs misconfigured

100%

Actionable recommendations

100%

Multiple headers assessed

100%

88%

-8%

Fintech Platform Security Review Before Banking Partner Due Diligence

Fintech pre-launch security compliance report

Criteria

Without context

With context

Security grade present

100%

Numeric score present

100%

Missing headers identified

100%

Misconfigured headers identified

100%

Per-header recommendations

100%

HSTS listed as top priority

100%

HSTS downgrade attack explanation

100%

HSTS directive example

100%

CSP strict policy recommended

66%

100%

CSP linked to XSS

100%

Multiple headers covered

100%

98%

18%

API Gateway Security Header Audit for Mobile App Backend

API endpoint security header analysis

Criteria

Without context

With context

Security grade present

100%

Numeric score present

100%

Missing vs present distinction

100%

HSTS assessed

100%

HSTS downgrade prevention

100%

HSTS concrete directive

100%

HSTS as top priority

100%

CSP assessed

100%

Strict CSP recommended

80%

CSP XSS linkage

100%

Actionable concrete recommendations

100%

Multiple headers assessed

100%

Comprehensive Security Assessment with Long-Term Monitoring Strategy

Vulnerability scanner integration and comprehensive security assessment

Criteria

Without context

With context

Security grade present

100%

Numeric score present

100%

Missing headers identified

100%

Misconfigured headers identified

100%

Regular scanning recommended

100%

Scanning frequency specified

100%

Regression detection guidance

100%

Complementary security tools mentioned

100%

Vulnerability scanner specifically mentioned

100%

HSTS downgrade protection

100%

CSP XSS mitigation

100%

Actionable remediation steps

100%

Repository: jeremylongshore/claude-code-plugins-plus-skills
Commit: 13d35b8

Evaluated: 2 months ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Website Security Header Assessment Pre-Audit HTTP Security Review Security Header Monitoring Program Merger Security Posture Comparison Web Server Security Header Hardening Third-Party Payment Provider Security Vetting Fintech Platform Security Review Before Banking Partner Due Diligence API Gateway Security Header Audit for Mobile App Backend Comprehensive Security Assessment with Long-Term Monitoring Strategy

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