Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/sergekostenchuk/seo-llm-skill-clusternpx agentmods add skills/sergekostenchuk/seo-llm-skill-cluster/technical-seo-schema-engineerWrote 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/sergekostenchuk/seo-llm-skill-cluster/technical-seo-schema-engineer)<a href="https://agentmods.dev/skills/sergekostenchuk/seo-llm-skill-cluster/technical-seo-schema-engineer"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/seo-llm-skill-cluster/technical-seo-schema-engineer/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/sergekostenchuk/seo-llm-skill-cluster/technical-seo-schema-engineer"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/seo-llm-skill-cluster/technical-seo-schema-engineer.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 | $0.00101 | $0.00903 |
| Opus 5 | $0.00051 | $0.00451 |
| Sonnet 5 | $0.00020 | $0.00181 |
| Haiku 4.5 | $0.00010 | $0.00090 |
Grade A, and why
technical-seo-schema-engineer 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 11d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- technical-seo-schema-engineer — 100% identical, 4 lines differ
How it starts
The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Technical SEO Schema Engineer
Use this skill after information-architecture-seo has defined page roles and before live regression validation.
Read references/schema-patterns.md before designing full metadata or JSON-LD templates.
Owns
- title and meta description rules;
- canonical and hreflang tag templates;
- JSON-LD schema patterns;
- OpenGraph and Twitter card metadata;
- sitemap, news-sitemap, RSS, robots.txt, and llms.txt output policy;
- publisher logo and ImageObject fallback policy;
- page-type metadata checklist.
Does Not Own
- semantic core;
- final URL architecture;
- internal link graph;
- live audit execution;
- hidden content;
- visual page layout.
Workflow
- Read
url-map.yaml, page roles, content model, language groups, and visible content requirements. - Select metadata and schema by page role.
- Define title/meta fallbacks and length guidance.
- Define canonical and hreflang tags from URL map.
- Define JSON-LD nodes that match visible page content.
- Define OG/Twitter image policy: media, video poster, publisher card, or fallback OG card.
- Define sitemap/RSS/robots/llms.txt inclusion rules.
- Produce schema/head guidance using assets/jsonld-templates.md and assets/head-metadata.template.html.
- Hand off validation to
seo-regression-validator.
Non-Negotiables
- Schema must match visible content.
- Do not add FAQPage unless the FAQ block is visible to users.
- Do not add review, rating, price, author, publisher, date, image, or source claims that are absent or unsupported.
- Do not use JSON-LD to hide extra keywords, extra entities, or alternate facts.
- NewsArticle.image must resolve to media, poster, or a stable fallback ImageObject.
- Canonical and hreflang must follow URL architecture.
- Current Google/schema.org/crawler rules require primary-source verification before production changes.
Safety And Privacy Boundaries
What ships with it
6 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.
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.
- 11d ago First seen · 91 lines · 101 tokens per session scan A 3fb8cb8e7f22
technical-seo-schema-engineer is a skill published in the GitHub repository sergekostenchuk/seo-llm-skill-cluster (39 stars, last pushed 3mo ago), licensed MIT. It adds 101 tokens to every session and 903 once invoked, about $0.0005 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 2026-08-30.
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