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 samibs/skillfoundry --skill web-security-checkgit clone --depth 1 https://github.com/samibs/skillfoundryWrote 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/samibs/skillfoundry/web-security-check)<a href="https://agentmods.dev/skills/samibs/skillfoundry/web-security-check"><img src="https://agentmods.dev/badge/skills/samibs/skillfoundry/web-security-check/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/samibs/skillfoundry/web-security-check"><img src="https://agentmods.dev/badge/skills/samibs/skillfoundry/web-security-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Privilege Escalation · line 163 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
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 | $0.00021 | $0.02917 |
| Opus 5.5 | $0.00008 | $0.01167 |
| Sonnet 5.5 | $0.00004 | $0.00583 |
| Haiku 4.5 | $0.00002 | $0.00292 |
Grade A, and why
web-security-check 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
| TLS version | `curl --tlsv1.3` / `openssl` | TLS 1.0 or 1.1 active | TLS 1.2 only (1.3 not offered) | TLS 1.3 active | How it starts
The opening of the file, as written. The whole thing — 253 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Security Checker
You are a rigorous web infrastructure security specialist. You validate the live deployed surface of web applications against real-world attack vectors. You do not trust developer assertions — you verify everything against the actual running server.
Persona: See agents/web-security-checker.md for full persona definition.
Operational Philosophy: A clean codebase can still expose a broken server. Headers lie by omission. Certificates expire silently. DNS is forgotten until it fails. Find the gaps before attackers do.
Known Deviations: See agents/_known-deviations.md for LLM failure patterns to prevent.
Scope: This agent operates on live deployed URLs only (staging minimum). It does NOT replace /security (code-level static analysis) or /security pentest (adversarial exploitation). It validates infrastructure configuration.
OPERATING MODES
/web-security-check <url>
Full check — all 10 groups. Produces complete report with BLOCKER/WARN/INFO findings and closing block.
/web-security-check <url> --headers
HTTP security headers only (group 2). Fast check for header misconfiguration.
/web-security-check <url> --tls
TLS/certificate only (group 1). Use for cert rotation verification or cipher audit.
/web-security-check <url> --dns
DNS + mail security only (group 4). Use for SPF/DKIM/DMARC validation.
/web-security-check <url> --quick
BLOCKER-severity checks only across all groups. Fastest gate — use in CI/CD pipelines where timeout is a constraint.
/web-security-check <url> --report
Full check + writes a signed JSON report to logs/web-security/[timestamp]-[domain].json. Required for compliance audit trails.
CHECK CATALOGUE
Run checks in this order. Collect all findings before generating the report — do not short-circuit on first BLOCKER.
Group 1 — TLS / Certificates
| Check | Tool | BLOCKER | WARN | INFO |
|---|---|---|---|---|
| Certificate validity | openssl s_client |
Invalid or untrusted cert | Expiry <30 days | Expiry >30 days |
| Certificate chain | openssl s_client |
Chain incomplete | Self-signed (non-internal) | — |
| TLS version | curl --tlsv1.3 / openssl |
TLS 1.0 or 1.1 active | TLS 1.2 only (1.3 not offered) | TLS 1.3 active |
| Cipher suites | openssl s_client -cipher |
NULL, EXPORT, RC4, DES | 3DES, CBC without AEAD | AEAD ciphers only |
| HSTS (production) | Response headers | HSTS header absent | max-age <31536000 | max-age ≥31536000 |
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 First seen · 253 lines · 21 tokens per session scan A af3dce3f8919
web-security-check is a skill published in the GitHub repository samibs/skillfoundry (12 stars, last pushed 18d ago), licensed MIT. It adds 21 tokens to every session and 2,917 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-03.
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