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seo-audit

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UpdatedMarch 13, 2026 at 04:50

Full website SEO audit with parallel subagent delegation. Crawls up to 500 pages, detects business type, delegates to 6 specialists, generates health score. Use when user says "audit", "full SEO check", "analyze my site", or "website health check".

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01clauding/claude-seo-skill

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name	seo-audit
description	Full website SEO audit with parallel subagent delegation. Crawls up to 500 pages, detects business type, delegates to 6 specialists, generates health score. Use when user says "audit", "full SEO check", "analyze my site", or "website health check".

Full Website SEO Audit

Process

Fetch homepage — use scripts/fetch_page.py to retrieve HTML
Detect business type — analyze homepage signals per seo orchestrator
Crawl site — follow internal links up to 500 pages, respect robots.txt
Delegate to subagents (if available, otherwise run inline sequentially):
- seo-technical — robots.txt, sitemaps, canonicals, Core Web Vitals, security headers
- seo-content — E-E-A-T, readability, thin content, AI citation readiness
- seo-schema — detection, validation, generation recommendations
- seo-sitemap — structure analysis, quality gates, missing pages
- seo-performance — LCP, INP, CLS measurements
- seo-visual — screenshots, mobile testing, above-fold analysis
Score — aggregate into SEO Health Score (0-100)
Report — generate prioritized action plan

Crawl Configuration

Max pages: 500
Respect robots.txt: Yes
Follow redirects: Yes (max 3 hops)
Timeout per page: 30 seconds
Concurrent requests: 5
Delay between requests: 1 second

Output Files

FULL-AUDIT-REPORT.md — Comprehensive findings
ACTION-PLAN.md — Prioritized recommendations (Critical → High → Medium → Low)
screenshots/ — Desktop + mobile captures (if Playwright available)

Scoring Weights

Category	Weight
Technical SEO	25%
Content Quality	25%
On-Page SEO	20%
Schema / Structured Data	10%
Performance (CWV)	10%
Images	5%
AI Search Readiness	5%

Report Structure

Executive Summary

Overall SEO Health Score (0-100)
Business type detected
Top 5 critical issues
Top 5 quick wins

Technical SEO

Crawlability issues
Indexability problems
Security concerns
Core Web Vitals status

Content Quality

E-E-A-T assessment
Thin content pages
Duplicate content issues
Readability scores

On-Page SEO

Title tag issues
Meta description problems
Heading structure
Internal linking gaps

Schema & Structured Data

Current implementation
Validation errors
Missing opportunities

Performance

LCP, INP, CLS scores
Resource optimization needs
Third-party script impact

Images

Missing alt text
Oversized images
Format recommendations

AI Search Readiness

Citability score
Structural improvements
Authority signals

Quick Audit Rules (Core Checklist)

Use these rules for rapid page-level assessment. Each rule has an ID, pass condition, and severity.

Core SEO (15 rules)

ID	Rule	Pass Condition	Severity
CS01	Title tag exists	Present, 30-60 chars	Critical
CS02	Title tag unique	No duplicates across site	High
CS03	Meta description exists	Present, 120-160 chars	High
CS04	H1 tag exists	Exactly one H1 per page	Critical
CS05	H1 contains target keyword	Primary keyword in H1	High
CS06	Heading hierarchy valid	H1→H2→H3, no skips	Medium
CS07	Canonical tag present	Self-referencing or correct canonical	Critical
CS08	URL is clean	Lowercase, hyphens, no params, ≤75 chars	Medium
CS09	Internal links present	≥3 internal links per page	High
CS10	Broken internal links	Zero 404s from internal links	Critical
CS11	Open Graph tags	og:title, og:description, og:image present	Medium
CS12	Language declared	`lang` attribute on `<html>`	Medium
CS13	Viewport meta tag	`width=device-width` present	Critical
CS14	No duplicate content	<15% similarity with other pages	High
CS15	Keyword in first 100 words	Primary keyword appears early	Medium

Performance (12 rules)

ID	Rule	Pass Condition	Severity
PF01	LCP ≤ 2.5s	CrUX p75 ≤ 2500ms	Critical
PF02	INP ≤ 200ms	CrUX p75 ≤ 200ms	Critical
PF03	CLS ≤ 0.1	CrUX p75 ≤ 0.1	Critical
PF04	TTFB ≤ 800ms	Server responds in ≤800ms	High
PF05	Total page weight ≤ 1.5MB	Compressed transfer size	High
PF06	JS bundle ≤ 300KB	Compressed JS total	High
PF07	No render-blocking resources	Critical CSS inlined, JS deferred	Medium
PF08	Images lazy-loaded	Below-fold images use loading="lazy"	Medium
PF09	HTTP/2 or HTTP/3	Protocol upgrade from HTTP/1.1	Medium
PF10	Compression enabled	gzip or brotli on text resources	High
PF11	Browser caching	Cache-Control headers on static assets	Medium
PF12	No excessive redirects	≤1 redirect per URL	Medium

Links (12 rules)

ID	Rule	Pass Condition	Severity
LK01	No broken outbound links	Zero 404/5xx from external links	High
LK02	No orphan pages	Every page has ≥1 internal link to it	High
LK03	Reasonable link depth	All pages ≤3 clicks from homepage	Medium
LK04	No excessive outbound links	≤100 outbound links per page	Medium
LK05	Anchor text descriptive	No "click here" or empty anchors	Medium
LK06	Nofollow used correctly	UGC/sponsored links marked	Medium
LK07	Sitemap links match live pages	All sitemap URLs return 200	Critical
LK08	Breadcrumbs present	BreadcrumbList on subpages	Medium
LK09	No redirect chains	Max 1 hop per redirect	High
LK10	Footer/nav links functional	All nav links resolve	Critical
LK11	Pagination correct	rel="next"/"prev" or load-more	Low
LK12	Hreflang reciprocal	Return links present if hreflang used	High

Images (10 rules)

ID	Rule	Pass Condition	Severity
IM01	Alt text on all images	Non-decorative images have alt	Critical
IM02	Alt text descriptive	10-125 chars, not "image1.jpg"	High
IM03	Modern format used	WebP or AVIF (not PNG/JPG for photos)	Medium
IM04	Images properly sized	No images wider than container	Medium
IM05	Responsive images	srcset/sizes attributes present	Medium
IM06	File size reasonable	Hero ≤200KB, content ≤100KB, thumb ≤50KB	High
IM07	Explicit dimensions	width/height attributes set (CLS prevention)	High
IM08	No broken images	All img src return 200	Critical
IM09	Lazy loading below fold	loading="lazy" on non-critical images	Medium
IM10	Image filenames descriptive	"blue-widget.webp" not "IMG_3847.jpg"	Low

Security (10 rules)

ID	Rule	Pass Condition	Severity
SC01	HTTPS everywhere	No mixed content, valid SSL cert	Critical
SC02	HSTS header	Strict-Transport-Security present	High
SC03	X-Content-Type-Options	nosniff header present	Medium
SC04	X-Frame-Options	DENY or SAMEORIGIN	Medium
SC05	CSP header	Content-Security-Policy present	Medium
SC06	No exposed secrets	No API keys/passwords in source	Critical
SC07	SSL cert valid	Not expired, correct domain	Critical
SC08	HTTP→HTTPS redirect	301 redirect from HTTP to HTTPS	Critical
SC09	No open directory listing	Directory browsing disabled	High
SC10	Secure cookies	HttpOnly + Secure flags on cookies	Medium

AI/GEO Readiness (10 rules)

ID	Rule	Pass Condition	Severity
AI01	AI crawlers allowed	GPTBot, ClaudeBot, PerplexityBot not blocked	High
AI02	llms.txt present	/llms.txt exists with structured content	Medium
AI03	Answer-first content	Direct answer in first 200 words	High
AI04	Self-contained answer blocks	134-167 word blocks for key topics	High
AI05	Question-based headings	H2/H3 match search queries	Medium
AI06	Statistics with sources	Data points cited with attribution	Medium
AI07	Author with credentials	Person schema + bio with expertise	High
AI08	Entity presence	Brand on Wikipedia/Reddit/YouTube	Medium
AI09	SSR for key content	Content visible without JS execution	Critical
AI10	Structured data coverage	Schema on ≥80% of content pages	Medium

Content Quality (11 rules)

ID	Rule	Pass Condition	Severity
CQ01	No thin pages	≥300 words for content pages	High
CQ02	Readability appropriate	Flesch Reading Ease 60-70 (general), adjust for audience	Medium
CQ03	Publication date visible	Date published and/or last updated shown	Medium
CQ04	Author attribution	Named author with bio link	High
CQ05	External citations	≥2 authoritative external sources cited	Medium
CQ06	No keyword stuffing	Primary keyword density 0.5-2.5%	High
CQ07	Unique value proposition	Content not duplicated from elsewhere	Critical
CQ08	Multimedia present	≥1 image/video per 500 words	Medium
CQ09	Table of contents	Present on pages ≥1500 words	Low
CQ10	No outdated content	Last updated within content type's refresh cycle	Medium
CQ11	Mobile content parity	Same content on mobile and desktop	High

Total: 80 core rules across 7 categories. Use these for rapid assessment; see individual sub-skills for deeper analysis.

Priority Definitions

Critical: Blocks indexing or causes penalties (fix immediately)
High: Significantly impacts rankings (fix within 1 week)
Medium: Optimization opportunity (fix within 1 month)
Low: Nice to have (backlog)