A website audit skill for search visibility, technical health, content, speed, security, JavaScript rendering, and readiness for AI systems. It checks the site against many rules and reports affected pages with issue severity and suggested fixes.

Use it to review a website before or after changes, investigate search-ranking or technical issues, and find problems with pages, links, images, performance, or security.

It brings common website problems into one report instead of requiring separate manual checks. This helps identify issues such as broken links, missing image descriptions, indexing problems, or slow loading.

seo-audit — Skill for Claude Code by seo-skills/seo-audit-skill

Install

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.

Any agent

npx skills add seo-skills/seo-audit-skill --skill skill

Clone the repo

git clone --depth 1 https://github.com/seo-skills/seo-audit-skill

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/seo-skills/seo-audit-skill/skill/github.svg)](https://agentmods.dev/skills/seo-skills/seo-audit-skill/skill)

Your own site

<a href="https://agentmods.dev/skills/seo-skills/seo-audit-skill/skill"><img src="https://agentmods.dev/badge/skills/seo-skills/seo-audit-skill/skill/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/seo-skills/seo-audit-skill/skill"><img src="https://agentmods.dev/badge/skills/seo-skills/seo-audit-skill/skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 80 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,890 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 2 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Privilege Escalation · line 141
Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
medium Rogue Agent · line 96
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00080	$0.05890
Opus 5.5	$0.00032	$0.02356
Sonnet 5.5	$0.00016	$0.01178
Haiku 4.5	$0.00008	$0.00589

Measured 22d ago against content hash 58e74793ef28, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 22d 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.

skill/SKILL.md · 546 lines

How it starts

The opening of the file, as written. The whole thing — 546 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SEO Audit Skill

Audit websites for SEO, technical, content, performance, security, JavaScript rendering, and AI readiness using the SEOmator CLI.

SEOmator provides comprehensive website auditing by analyzing website structure and content against 373 rules across 20 categories.

It provides a list of issues with severity levels, affected URLs, and actionable fix suggestions.

What This Skill Does

This skill enables AI agents to audit websites for 373 rules in 20 categories, including:

Core SEO (24 rules): Canonical URLs, indexing directives, title uniqueness, canonical conflicts/loops
Performance (28 rules): LCP, CLS, FCP, TTFB, INP, compression, caching, minification, HTTP/2
Links (27 rules): Broken links, redirect chains, anchor text, localhost/fragment links, plus click depth and inbound internal links from the site graph (--crawl)
Images (14 rules): Alt text, dimensions, lazy loading, modern formats, alt length, background images
Security (26 rules): HTTPS, HSTS, CSP, external link safety, leaked secrets, SSL expiry/protocol, cookie flags and lifetime
Technical SEO (18 rules): robots.txt, sitemap.xml, URL structure, 404 pages, soft 404s, error codes
Crawlability (38 rules): Sitemap conflicts, indexability signals, canonical chains, pagination issues, sitemap lastmod quality
Structured Data (19 rules): Schema.org markup, Article, Organization, FAQ, Product, Breadcrumb
JavaScript Rendering (16 rules): Rendered DOM checks, raw vs rendered mismatches, SSR detection, console errors, failed resource requests
Accessibility (36 rules): ARIA labels, color contrast, form labels, landmarks, touch targets
Content (27 rules): Word count, readability, keyword density, duplicate detection, pixel widths
Social (9 rules): Open Graph tags, Twitter cards, share buttons, profile links
E-E-A-T (16 rules): Author bylines, citations, trust signals, about/contact pages, YMYL detection
URL Structure (14 rules): Keyword slugs, stop words, uppercase, underscores, session IDs, tracking params
Redirects (11 rules): Redirect loops, types (301/302), meta refresh, JavaScript redirects, broken redirects
Mobile (12 rules): Font sizes, horizontal scroll, interstitials, viewport, mobile-first parity (content, title, canonical, structured data, links) via --mobile
Internationalization (13 rules): lang attribute, hreflang validation (return links, conflicts, mismatches)
HTML Validation (11 rules): Doctype, charset, head structure, lorem ipsum, multiple titles/descriptions
AI/GEO Readiness (13 rules): Semantic HTML, AI bot access, llms.txt, schema drift
Legal Compliance (1 rule): Cookie consent

Read the full file on GitHub · 546 lines

Files

What ships with it

2 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.

Changes

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.

22d ago Changed · +48 lines 58e74793ef28
1mo ago Changed ca05a1a59398
2mo ago Changed · +10 lines 5d5ba8cf72d5
2mo ago Changed · +9 lines cd06cd43cd59
2mo ago Changed · +115 lines · +21 tokens per session 0da2b2e4ebec
2mo ago First seen · 364 lines · 59 tokens per session scan A 644b7f5ec46b

Subscribe to this mod's changes

seo-audit is a skill published in the GitHub repository seo-skills/seo-audit-skill (663 stars, last pushed 22d ago), licensed MIT. It adds 80 tokens to every session and 5,890 once invoked, about $0.0003 per session on Opus 5.5. 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.

Analytics and metrics Marketing and SEO claude claude-skills seo seo-audit seo-audit-skill website-audit

seo-audit next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
seo-auditseo-skills/seo-audit-skill	Skill	663	22d ago	MIT	A	80	Claude Code
Pre-Launch Website Auditbzsasson/pre-launch-audit-skill	Skill	10	6mo ago	MIT	A	92	Claude Code
data-warehouse-experimentationrampstackco/claude-skills	Skill	1.0k	11d ago	MIT	A	157	Claude Code
documentation-strategyrampstackco/claude-skills	Skill	1.0k	11d ago	MIT	A	105	Claude Code
internationalizationrampstackco/claude-skills	Skill	1.0k	11d ago	MIT	A	123	Claude Code
qa-testingrampstackco/claude-skills	Skill	1.0k	11d ago	MIT	A	170	Claude Code
skill-creation-walkthroughrampstackco/claude-skills	Skill	1.0k	11d ago	MIT	A	135	Claude Code