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 berkcangumusisik/claude-code-practices --skill seo-checkgit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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/berkcangumusisik/claude-code-practices/seo-check)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/seo-check"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/seo-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/berkcangumusisik/claude-code-practices/seo-check"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/seo-check.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 | $0.00021 | $0.00335 |
| Opus 5 | $0.00010 | $0.00168 |
| Sonnet 5 | $0.00004 | $0.00067 |
| Haiku 4.5 | $0.00002 | $0.00034 |
Grade A, and why
seo-check 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 6d 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.
What it actually says
SEO Audit
Target: $1 (or all pages if not specified)
1. Metadata
grep -rn "title\|description\|metadata\|<head" src/app/ src/pages/ --include="*.tsx" | head -20
For Next.js App Router, check each layout.tsx and page.tsx:
export const metadatadefined?- Title is unique per page (not just app name)?
- Description 120-160 chars?
robotsconfig correct?
2. Open Graph & Twitter Cards
og:title,og:description,og:imageset?og:imageis 1200×630px?- Twitter card type set?
3. Structured Data
- Homepage: Organization/WebSite schema?
- Blog posts: Article schema?
- Products: Product schema?
4. Technical SEO
- Canonical URLs set?
sitemap.xmlexists and is registered?robots.txtnot blocking important paths?- Images have
alttext?
5. Performance (Core Web Vitals)
- Images using
next/imageorloading="lazy"? - Fonts using
font-display: swap?
Generate missing metadata and structured data. Apply on confirmation.
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.
- 6d ago First seen · 46 lines · 21 tokens per session scan A 4bee9381c850
seo-check is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 21 tokens to every session and 335 once invoked, about $0.0001 per session on Opus 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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