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 monkilabs/opencastle --skill seo-patternsgit clone --depth 1 https://github.com/monkilabs/opencastleWrote 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/monkilabs/opencastle/seo-patterns)<a href="https://agentmods.dev/skills/monkilabs/opencastle/seo-patterns"><img src="https://agentmods.dev/badge/skills/monkilabs/opencastle/seo-patterns/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/monkilabs/opencastle/seo-patterns"><img src="https://agentmods.dev/badge/skills/monkilabs/opencastle/seo-patterns.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 | $0.00052 | $0.00344 |
| Opus 5 | $0.00026 | $0.00172 |
| Sonnet 5 | $0.00010 | $0.00069 |
| Haiku 4.5 | $0.00005 | $0.00034 |
Grade A, and why
seo-patterns 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 5d 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 -s https://example.com/page | pup 'script[type=application/ld+json] text{}' | jq . What it actually says
SEO Patterns
Constraints
- Unique
<title>(50–60 chars) and<meta name="description">(150–160 chars) on every public page — duplicates across pages are a defect. - Canonical URL on every page.
noindexonly on admin/draft pages. - Primary content must be server-rendered; client-only rendered content is not indexed.
- OG image 1200×630 px.
- Mobile page load under 3 s.
Structured Data (JSON-LD)
Server-rendered, and it must return 0 errors from Google's Rich Results Test (https://search.google.com/test/rich-results) before shipping. Extract to inspect locally:
curl -s https://example.com/page | pup 'script[type=application/ld+json] text{}' | jq .
Sitemap & robots.txt
Generate the XML sitemap dynamically from the data source (CMS, DB, filesystem) and reference it from robots.txt via Sitemap: https://example.com/sitemap.xml. Use a sitemap index above 50,000 URLs or 50 MB. Include <lastmod> only when it is accurate. Disallow: /admin/, /api/, /preview/.
Post-deploy: check Search Console for warnings; remove any accidental Disallow: entry and resubmit the sitemap.
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.
- 5d ago First seen · 29 lines · 52 tokens per session scan A 114c65b44239
seo-patterns is a skill published in the GitHub repository monkilabs/opencastle (61 stars, last pushed 11d ago), licensed MIT. It adds 52 tokens to every session and 344 once invoked, about $0.0003 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 2026-09-03.
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