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 bhuvangupta/vapt-claude --skill vapt-headersgit clone --depth 1 https://github.com/bhuvangupta/vapt-claudeWrote 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/bhuvangupta/vapt-claude/vapt-headers)<a href="https://agentmods.dev/skills/bhuvangupta/vapt-claude/vapt-headers"><img src="https://agentmods.dev/badge/skills/bhuvangupta/vapt-claude/vapt-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/bhuvangupta/vapt-claude/vapt-headers"><img src="https://agentmods.dev/badge/skills/bhuvangupta/vapt-claude/vapt-headers.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00000 | $0.01593 |
| Opus 5 | $0.00000 | $0.00796 |
| Sonnet 5 | $0.00000 | $0.00319 |
| Haiku 4.5 | $0.00000 | $0.00159 |
Grade A, and why
vapt-headers scanned grade A with 1 finding 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 8d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sIL <url> How it starts
The opening of the file, as written. The whole thing — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Infrastructure & Security Headers
When Invoked
The user runs /vapt headers <url> or this skill is triggered as part of Wave 1 during /vapt audit.
Phase 1: Header Collection
1.1 Fetch Response Headers
curl -sIL <url>
Also check specific paths:
curl -sI <url>/login 2>/dev/null
curl -sI <url>/api 2>/dev/null
curl -sI <url>/admin 2>/dev/null
1.2 Extract All Security-Relevant Headers
Parse the response for each of these headers (case-insensitive):
Security Headers:
Content-Security-PolicyX-Frame-OptionsX-Content-Type-OptionsStrict-Transport-SecurityReferrer-PolicyPermissions-PolicyX-XSS-ProtectionCross-Origin-Opener-PolicyCross-Origin-Resource-PolicyCross-Origin-Embedder-Policy
CORS Headers:
Access-Control-Allow-OriginAccess-Control-Allow-MethodsAccess-Control-Allow-HeadersAccess-Control-Allow-Credentials
Information Disclosure:
ServerX-Powered-ByX-AspNet-VersionX-AspNetMvc-VersionX-Generator
Cache Headers (on sensitive pages):
Cache-ControlPragmaExpires
Phase 2: Header Analysis
2.1 Content-Security-Policy (CSP)
| Check | Severity if Failed |
|---|---|
| CSP header present | Medium (5.0) |
No unsafe-inline in script-src |
Medium (5.5) |
No unsafe-eval in script-src |
Medium (5.5) |
No wildcard * in default-src |
Medium (4.5) |
frame-ancestors defined |
Medium (4.5) |
| Reports configured (report-uri/report-to) | Info (0.0) |
2.2 X-Frame-Options / frame-ancestors
| Check | Severity if Failed |
|---|---|
| X-Frame-Options or CSP frame-ancestors present | Medium (4.3) — clickjacking |
| Value is DENY or SAMEORIGIN (not ALLOW-FROM *) | Medium (4.3) |
2.3 HSTS
| Check | Severity if Failed |
|---|---|
| Strict-Transport-Security present | Medium (5.0) |
| max-age >= 31536000 (1 year) | Low (3.5) |
| includeSubDomains directive | Low (2.5) |
| On HSTS preload list | Info (0.0) |
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.
- 8d ago First seen · 213 lines · 0 tokens per session scan A 474febf3b929
vapt-headers is a skill published in the GitHub repository bhuvangupta/vapt-claude (1 stars, last pushed 5mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,593 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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