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 Kin9Zeus/senior-engineer-skills --skill web-presence-auditgit clone --depth 1 https://github.com/Kin9Zeus/senior-engineer-skillsWrote 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/kin9zeus/senior-engineer-skills/web-presence-audit)<a href="https://agentmods.dev/skills/kin9zeus/senior-engineer-skills/web-presence-audit"><img src="https://agentmods.dev/badge/skills/kin9zeus/senior-engineer-skills/web-presence-audit/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/kin9zeus/senior-engineer-skills/web-presence-audit"><img src="https://agentmods.dev/badge/skills/kin9zeus/senior-engineer-skills/web-presence-audit.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 | $0.00204 | $0.03864 |
| Opus 5 | $0.00102 | $0.01932 |
| Sonnet 5 | $0.00041 | $0.00773 |
| Haiku 4.5 | $0.00020 | $0.00386 |
Grade A, and why
web-presence-audit 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 12d 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 -o /dev/null -w '%{http_code}' https://site.com/nonexistent-xyz`. How it starts
The opening of the file, as written. The whole thing — 353 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Presence Audit
The public surface is where the product meets people who do not yet trust it. Every gap here costs traffic, conversion or credibility — and unlike most engineering debt, the cost is continuous and silent.
This skill covers four layers. Run them in order; each depends on the one above.
1. CRAWLABLE Can a machine find, fetch and index this at all?
2. LEGIBLE Does each page declare what it is, uniquely and correctly?
3. STRUCTURED Can a machine understand the entities and answer questions with it?
4. TRUSTED Would a stranger believe this is a real business and act?
Verify against the live rendered page, not the source. Server-side headers,
proxies, CDNs and client-side rendering all change what a crawler actually sees.
Run scripts/web-check.sh <url> for the automated first pass.
Layer 1 — Crawlable
| Check | Requirement | Severity if missing |
|---|---|---|
robots.txt |
Exists at the root, does not accidentally block the site, references the sitemap | P1 |
sitemap.xml |
Generated (never hand-maintained), only canonical indexable URLs, submitted to Search Console | P2 |
| Custom 404 | Returns a real 404 status, offers navigation and search, does not dead-end | P2 |
| Custom 500 | Branded, leaks no stack trace | P2 |
| Canonical URL | One per page, self-referencing by default | P2 |
| HTTPS | Enforced, HTTP redirected once, no mixed content | P1 |
| One hostname | www and apex resolve to one canonical host, 301 not 302 |
P2 |
| Trailing slash | Consistent; the other form redirects | P3 |
| No index bloat | Filters, sorts, pagination and internal search not indexable | P2 |
| Render check | Content present without JavaScript, or server-rendered | P1 for a content site |
| No orphan pages | Every important page reachable by internal links | P2 |
The two failures that silently destroy traffic:
A soft 404 — a missing page returning 200 with "not found" text. Crawlers
index it, and every mistyped URL becomes a thin duplicate page. Test with
curl -o /dev/null -w '%{http_code}' https://site.com/nonexistent-xyz.
What ships with it
11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/onpage-and-content.md 9.2 KB
- references/structured-data.md 11 KB
- references/technical-seo.md 8.7 KB
- references/trust-and-conversion.md 10 KB
- scripts/web-check.ps1 12 KB runs code
- scripts/web-check.sh 13 KB runs code
- templates/404-page.md 4.3 KB
- templates/case-study.md 5.6 KB
- templates/faq-page.md 6.2 KB
- templates/robots.txt 3.3 KB
- templates/thank-you-page.md 6.0 KB
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.
- 12d ago First seen · 353 lines · 204 tokens per session scan A 9246e9a70615
web-presence-audit is a skill published in the GitHub repository Kin9Zeus/senior-engineer-skills (3 stars, last pushed 18d ago), licensed MIT. It adds 204 tokens to every session and 3,864 once invoked, about $0.0010 per session on Opus 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 2026-08-31.
Other skills, from other repositories
accessibility
Audit and improve web accessibility following WCAG 2.2 guidelines. Use when asked to "improve accessibility", "a11y audit", "WCAG compliance", "screen reader support", "keyboard navigation", or "make accessible".
performance
Optimize web performance for faster loading and better user experience. Use when asked to "speed up my site", "optimize performance", "reduce load time", "fix slow loading", "improve page speed", or "performance audit".
seo
Optimize for search engine visibility and ranking. Use when asked to "improve SEO", "optimize for search", "fix meta tags", "add structured data", "sitemap optimization", or "search engine optimization".
best-practices
Apply modern web development best practices for security, compatibility, and code quality. Use when asked to "apply best practices", "security audit", "modernize code", "code quality review", or "check for vulnerabilities".
core-web-vitals
Optimize Core Web Vitals (LCP, INP, CLS) for better page experience using field and lab evidence. Use when asked to "improve Core Web Vitals", "fix LCP", "reduce CLS", "optimize INP", "page experience optimization", or "fix layout shifts".
web-quality-audit
Run an evidence-led web quality audit covering performance, accessibility, SEO, best practices, and agentic browsing. Use when asked to "audit my site", "review web quality", "run lighthouse audit", "check page quality", or "optimize my website".