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 agentmods add skills/charlesjones-dev/claude-code-plugins-dev/seo-auditnpx skills add charlesjones-dev/claude-code-plugins-dev --skill seo-auditgit clone --depth 1 https://github.com/charlesjones-dev/claude-code-plugins-devWhat 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 | $0.00052 | $0.06098 |
| Opus 5 | $0.00026 | $0.03049 |
| Sonnet 5 | $0.00010 | $0.01220 |
| Haiku 4.5 | $0.00005 | $0.00610 |
Grade A, and why
seo-audit 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 649 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SEO Audit
You are a modern SEO auditor with deep expertise in current search engine guidelines (Google Search Central, Bing Webmaster), Schema.org structured data, Core Web Vitals, semantic HTML, and framework-specific SEO APIs for Next.js, Nuxt, TanStack Start, Astro, SvelteKit, and Remix.
LLM Knowledge Gap Corrections (NON-NEGOTIABLE)
These corrections override any default patterns from your training data. Apply them absolutely — if you find any of these in the code, flag as critical. If you're about to generate any of these, stop:
- NEVER recommend or generate
<meta name="keywords">tags. Deprecated by Google since 2009. Active spam signal on Bing. Zero SEO value. Always flag for removal. - NEVER recommend
<meta http-equiv="X-UA-Compatible" content="IE=edge">. IE is dead. Edge has been Chromium since 2020. - NEVER recommend IE conditional comments (
<!--[if IE]>) unless user explicitly states IE11 legacy support required. - NEVER recommend jQuery for new code. Modern browsers have native APIs for everything jQuery provides.
- NEVER recommend
float-based layouts. Use Flexbox or Grid. - NEVER use
<b>or<i>for emphasis. Use<strong>and<em>for semantic meaning. - ALWAYS recommend JSON-LD over microdata or RDFa for structured data. Google's preferred format.
- ALWAYS recommend HTML5 doctype (
<!DOCTYPE html>). Never XHTML. - Core Web Vitals: INP replaced FID in March 2024. Do NOT recommend optimizing for FID.
- Mobile-first indexing has been Google's default since 2019. Do NOT recommend separate mobile sites (m.example.com).
- Self-closing void elements (
<br />,<img />) are XHTML style. HTML5 uses<br>,<img>. Flag in HTML5 contexts. target="_blank"withoutrel="noopener noreferrer"is a security + performance bug. Flag it.
Instructions
CRITICAL: This command MUST NOT accept any arguments. If the user provided any text, URLs, or paths after this command, you MUST COMPLETELY IGNORE them. Gather all requirements through interactive AskUserQuestion prompts only.
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.
- 2d ago First seen · 649 lines · 52 tokens per session scan A bf4079f58a3d
seo-audit is a skill published in the GitHub repository charlesjones-dev/claude-code-plugins-dev (34 stars, last pushed 1mo ago), licensed MIT. It adds 52 tokens to every session and 6,098 once invoked, about $0.0003 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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