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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/secondsky/claude-skills --skill security-headers-configuration- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads security-headers-configuration automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Security Headers Configuration
Implement HTTP security headers to defend against common browser-based attacks.
Essential Headers
| Header | Purpose | Value |
|---|---|---|
| HSTS | Force HTTPS | max-age=31536000; includeSubDomains |
| CSP | Restrict resources | default-src 'self' |
| X-Frame-Options | Prevent clickjacking | DENY |
| X-Content-Type-Options | Prevent MIME sniffing | nosniff |
Express Implementation
const helmet = require('helmet');
app.use(helmet());
// Custom CSP
app.use(helmet.contentSecurityPolicy({
directives: {
defaultSrc: ["'self'"],
scriptSrc: ["'self'", "'unsafe-inline'"],
styleSrc: ["'self'", "'unsafe-inline'"],
imgSrc: ["'self'", "data:", "https:"],
connectSrc: ["'self'", "https://api.example.com"],
fontSrc: ["'self'", "https://fonts.gstatic.com"],
frameAncestors: ["'none'"]
}
}));
Nginx Configuration
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
add_header X-Frame-Options "DENY" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
add_header Content-Security-Policy "default-src 'self'; script-src 'self'" always;
Verification Tools
Security Headers Checklist
- HSTS enabled with long max-age
- CSP configured and tested
- X-Frame-Options set to DENY
- X-Content-Type-Options set to nosniff
- Referrer-Policy configured
- Permissions-Policy disables unused features
Additional Implementations
See references/python-apache.md for:
- Python Flask security headers middleware
- Flask-Talisman library configuration
- Apache .htaccess configuration
- Header testing script
Common Mistakes
- Setting CSP to report-only permanently
- Using overly permissive policies
- Forgetting to test after changes
- Not including all subdomains in HSTS
FAQ
What does the security-headers-configuration skill do?
Configures HTTP security headers to protect against XSS, clickjacking, and MIME sniffing attacks. Use when hardening web applications, passing security audits, or implementing Content Security Policy.
How do I install security-headers-configuration?
Run npx skills add https://github.com/secondsky/claude-skills --skill security-headers-configuration in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/security-headers-configuration/ (personal) or .claude/skills/security-headers-configuration/ (project).
Which AI agents can use security-headers-configuration?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is security-headers-configuration safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains security-headers-configuration?
It is published by secondsky in secondsky/claude-skills. It has 440 recorded installs.
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