Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add cwinvestments/memstack --skill csp-headersgit clone --depth 1 https://github.com/cwinvestments/memstackWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/cwinvestments/memstack/csp-headers)<a href="https://agentmods.dev/skills/cwinvestments/memstack/csp-headers"><img src="https://agentmods.dev/badge/skills/cwinvestments/memstack/csp-headers/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/cwinvestments/memstack/csp-headers"><img src="https://agentmods.dev/badge/skills/cwinvestments/memstack/csp-headers.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00083 | $0.04048 |
| Opus 5.5 | $0.00033 | $0.01619 |
| Sonnet 5.5 | $0.00017 | $0.00810 |
| Haiku 4.5 | $0.00008 | $0.00405 |
Grade A, and why
memstack-security-csp-headers scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 442 lines — stays where its author put it; the contents beside it link to each section on GitHub.
🛡️ CSP Headers: Security Headers Auditor & Generator
Audit existing security headers, identify overly permissive directives, and generate a production-ready Content-Security-Policy with companion headers.
Activation
When this skill activates, output:
🛡️ CSP Headers: Auditing your security headers...
| Context | Status |
|---|---|
| User says "CSP", "security headers", "Content-Security-Policy" | ACTIVE |
| User wants to fix unsafe-inline, unsafe-eval, or wildcard directives | ACTIVE |
| User mentions HSTS, X-Frame-Options, or Permissions-Policy | ACTIVE |
| User wants a full OWASP security audit (not just headers) | DORMANT: see owasp-top10 |
| User wants to scan for secrets in code | DORMANT: see secrets-scanner |
| User wants API-level security (auth, rate limiting) | DORMANT: see api-audit |
Protocol
Step 1: Gather Inputs
Ask the user for:
- Framework: Next.js, Express, Fastify, Nginx, Caddy, static hosting?
- CDN/hosting: Vercel, Netlify, Cloudflare, self-hosted?
- External resources: Which third-party scripts, fonts, images, or APIs are loaded? (analytics, payment widgets, CDNs)
- Inline scripts: Does the app use inline
<script>tags or inline styles? - Iframes: Does the app embed iframes or get embedded by others?
Step 2: Scan Existing Headers
Check for CSP and security headers in all possible locations:
Where to look:
- Middleware: Express/Next.js middleware setting response headers
- Config files:
next.config.js(headers()function),nginx.conf,Caddyfile - Meta tags:
<meta http-equiv="Content-Security-Policy" content="...">in HTML - Hosting config:
vercel.json,netlify.toml,_headersfile - Reverse proxy: Nginx/Caddy/Apache header directives
── EXISTING HEADERS FOUND ─────────────────
Location: [file:line or "not found"]
Content-Security-Policy:
[current policy or "MISSING"]
Strict-Transport-Security:
[current value or "MISSING"]
X-Content-Type-Options:
[current value or "MISSING"]
X-Frame-Options:
[current value or "MISSING"]
Referrer-Policy:
[current value or "MISSING"]
Permissions-Policy:
[current value or "MISSING"]
X-XSS-Protection:
[current value or "MISSING, deprecated but still useful for older browsers"]
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed ccb1908b42eb
- 1mo ago First seen · 442 lines · 83 tokens per session scan A 5ea6d116302e
memstack-security-csp-headers is a skill published in the GitHub repository cwinvestments/memstack (425 stars, last pushed yesterday), licensed MIT. It adds 83 tokens to every session and 4,048 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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