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/seo-regression-validatorWrote 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/seo-regression-validator)<a href="https://agentmods.dev/skills/sergekostenchuk/seo-llm-skill-cluster/seo-regression-validator"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/seo-llm-skill-cluster/seo-regression-validator/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/seo-regression-validator"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/seo-llm-skill-cluster/seo-regression-validator.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 | $0.00100 | $0.00711 |
| Opus 5 | $0.00050 | $0.00356 |
| Sonnet 5 | $0.00020 | $0.00142 |
| Haiku 4.5 | $0.00010 | $0.00071 |
Grade A, and why
seo-regression-validator 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:
- seo-regression-validator — 100% identical, 6 lines differ
How it starts
The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SEO Regression Validator
Use this skill after technical SEO/schema guidance exists, before claiming a site or skill output is done.
Read references/regression-checklist.md before running a broad audit.
Owns
- live HTML and local fixture checks;
- pass/fail severity model;
- timestamped evidence reports;
- schema/head metadata checks;
- public artifact reachability checks;
- regression report templates;
- negative tests for missing JSON-LD, duplicate canonical, missing image, and fake reports.
Does Not Own
- implementing SEO fixes;
- Search Console credentialed data;
- analytics exports;
- external authority placement;
- mutating target websites.
Workflow
- Define target URLs or fixture files.
- Record timestamp, target, method, and user agent.
- Fetch or read the target without mutation.
- Run deterministic checks using scripts/audit_static_seo.py when HTML is available.
- Separate critical failures, warnings, and skipped checks.
- Record skipped checks instead of treating them as passes.
- Produce or update
seo-regression-report.jsonand a human-readable validation summary. - Route implementation fixes to the appropriate specialist.
Critical By Default
- missing
<title>; - missing meta description;
- missing or duplicate canonical;
- no JSON-LD on pages expected to have schema;
- invalid JSON-LD;
- NewsArticle without usable image;
- public page blocked or unreachable during live check;
- report claims success without fetching or reading target.
Warning By Default
- missing hreflang when a multilingual equivalent is expected;
- missing OG/Twitter social tags;
- missing RSS autodiscovery;
- missing viewport;
- article meta tags missing when an article schema exists;
- no visible breadcrumb when BreadcrumbList is expected;
- performance metrics not measured.
Safety And Privacy Boundaries
- Do not mutate target sites.
- Do not use credentials unless the user explicitly provides them for this task.
- Do not store cookies, tokens, raw private analytics, raw IP logs, or private Search Console rows in reports.
- Do not claim ranking, indexing, citation, or crawler behavior from one HTML check.
What ships with it
9 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 · 92 lines · 100 tokens per session scan A ce256bb92b66
seo-regression-validator is a skill published in the GitHub repository sergekostenchuk/seo-llm-skill-cluster (39 stars, last pushed 3mo ago), licensed MIT. It adds 100 tokens to every session and 711 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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