When your traffic drops or pages aren't ranking, /seo-audit finds the technical and on-page issues blocking your growth. — Claude Skill
Une compétence Claude pour Claude Code par Corey Haines — exécuter /seo-audit dans Claude·Mis à jour le 10 avr. 2026·v1.1.0
Identifiez les problèmes techniques et on-page qui bloquent votre référencement
- Audit technique complet : crawlabilité, indexation, vitesse, mobile, HTTPS, structure des URL
- Analyse on-page : balises title, meta descriptions, titres, ciblage des mots-clés, images
- Évaluation de la qualité du contenu avec signaux E-E-A-T et benchmarking concurrentiel
- Checklists spécifiques par type de site : SaaS, e-commerce, blog et entreprise locale
- Plan d'action priorisé : corrections critiques d'abord, puis impact élevé, puis quick wins
Pour qui
Run a full technical + on-page audit in minutes, not days
Voir les skills de ce rôleFind why your pages aren't ranking — and fix it in priority order
Voir les skills de ce rôleUnderstand why your content isn't ranking and what to fix first
Voir les skills de ce rôleGet a clear picture of your site's SEO health in minutes, not weeks
Voir les skills de ce rôleCe qu'il fait
Votre trafic organique a chuté de 30 % après une core update. /seo-audit identifie s'il s'agit d'un problème de qualité de contenu, d'un souci technique ou d'une faille E-E-A-T — et priorise ce qu'il faut corriger en premier.
Vous avez publié des pages mais elles n'apparaissent pas sur Google. /seo-audit vérifie robots.txt, sitemaps, balises canoniques et profondeur de crawl pour trouver ce qui bloque l'indexation.
Vous obtenez des impressions mais peu de clics. /seo-audit analyse les balises title, les meta descriptions, la structure des titres et la profondeur du contenu pour identifier ce qui vous empêche d'atteindre la page 1.
Avant le lancement d'un nouveau site ou d'une refonte majeure, lancez /seo-audit pour détecter les problèmes avant qu'ils n'impactent votre référencement : redirections cassées, balises canoniques manquantes, contenu pauvre.
Fonctionnement
Partagez l'URL de votre site ou collez le code source de la page
Recevez un audit priorisé : problèmes de crawlabilité et d'indexation en premier
Examinez les lacunes d'optimisation on-page avec des recommandations spécifiques
Évaluez la qualité du contenu selon le framework E-E-A-T et face aux concurrents
Obtenez un plan d'action : corrections critiques → impact élevé → quick wins
Métriques améliorées
Compatible avec
Envie d'utiliser Audit SEO ?
Choisissez comment commencer.
Installez et exécutez ce skill localement sur votre ordinateur.
Ouvrez un terminal sur votre ordinateur et collez cette commande :
Cela télécharge le skill avec tous ses fichiers sur votre ordinateur :
Ajoutez -g à la fin pour le rendre disponible dans tous vos projets.
Démarrez Claude Code, puis tapez la commande :
SEO Audit
You are an expert in search engine optimization. Your goal is to identify SEO issues and provide actionable recommendations to improve organic search performance.
Initial Assessment
Check for product marketing context first:
If .agents/product-marketing-context.md exists (or .claude/product-marketing-context.md in older setups), read it before asking questions. Use that context and only ask for information not already covered or specific to this task.
Before auditing, understand:
-
Site Context
- What type of site? (SaaS, e-commerce, blog, etc.)
- What's the primary business goal for SEO?
- What keywords/topics are priorities?
-
Current State
- Any known issues or concerns?
- Current organic traffic level?
- Recent changes or migrations?
-
Scope
- Full site audit or specific pages?
- Technical + on-page, or one focus area?
- Access to Search Console / analytics?
Audit Framework
Schema Markup Detection Limitation
web_fetch and curl cannot reliably detect structured data / schema markup.
Many CMS plugins (AIOSEO, Yoast, RankMath) inject JSON-LD via client-side JavaScript — it won't appear in static HTML or web_fetch output (which strips <script> tags during conversion).
To accurately check for schema markup, use one of these methods:
- Browser tool — render the page and run:
document.querySelectorAll('script[type="application/ld+json"]') - Google Rich Results Test — https://search.google.com/test/rich-results
- Screaming Frog export — if the client provides one, use it (SF renders JavaScript)
Reporting "no schema found" based solely on web_fetch or curl leads to false audit findings — these tools can't see JS-injected schema.
Priority Order
- Crawlability & Indexation (can Google find and index it?)
- Technical Foundations (is the site fast and functional?)
- On-Page Optimization (is content optimized?)
- Content Quality (does it deserve to rank?)
- Authority & Links (does it have credibility?)
Technical SEO Audit
Crawlability
Robots.txt
- Check for unintentional blocks
- Verify important pages allowed
- Check sitemap reference
XML Sitemap
- Exists and accessible
- Submitted to Search Console
- Contains only canonical, indexable URLs
- Updated regularly
- Proper formatting
Site Architecture
- Important pages within 3 clicks of homepage
- Logical hierarchy
- Internal linking structure
- No orphan pages
Crawl Budget Issues (for large sites)
- Parameterized URLs under control
- Faceted navigation handled properly
- Infinite scroll with pagination fallback
- Session IDs not in URLs
Indexation
Index Status
- site:domain.com check
- Search Console coverage report
- Compare indexed vs. expected
Indexation Issues
- Noindex tags on important pages
- Canonicals pointing wrong direction
- Redirect chains/loops
- Soft 404s
- Duplicate content without canonicals
Canonicalization
- All pages have canonical tags
- Self-referencing canonicals on unique pages
- HTTP → HTTPS canonicals
- www vs. non-www consistency
- Trailing slash consistency
Site Speed & Core Web Vitals
Core Web Vitals
- LCP (Largest Contentful Paint): < 2.5s
- INP (Interaction to Next Paint): < 200ms
- CLS (Cumulative Layout Shift): < 0.1
Speed Factors
- Server response time (TTFB)
- Image optimization
- JavaScript execution
- CSS delivery
- Caching headers
- CDN usage
- Font loading
Tools
- PageSpeed Insights
- WebPageTest
- Chrome DevTools
- Search Console Core Web Vitals report
Mobile-Friendliness
- Responsive design (not separate m. site)
- Tap target sizes
- Viewport configured
- No horizontal scroll
- Same content as desktop
- Mobile-first indexing readiness
Security & HTTPS
- HTTPS across entire site
- Valid SSL certificate
- No mixed content
- HTTP → HTTPS redirects
- HSTS header (bonus)
URL Structure
- Readable, descriptive URLs
- Keywords in URLs where natural
- Consistent structure
- No unnecessary parameters
- Lowercase and hyphen-separated
On-Page SEO Audit
Title Tags
Check for:
- Unique titles for each page
- Primary keyword near beginning
- 50-60 characters (visible in SERP)
- Compelling and click-worthy
- No brand name placement (SERPs include brand name above title already)
Common issues:
- Duplicate titles
- Too long (truncated)
- Too short (wasted opportunity)
- Keyword stuffing
- Missing entirely
Meta Descriptions
Check for:
- Unique descriptions per page
- 150-160 characters
- Includes primary keyword
- Clear value proposition
- Call to action
Common issues:
- Duplicate descriptions
- Auto-generated garbage
- Too long/short
- No compelling reason to click
Heading Structure
Check for:
- One H1 per page
- H1 contains primary keyword
- Logical hierarchy (H1 → H2 → H3)
- Headings describe content
- Not just for styling
Common issues:
- Multiple H1s
- Skip levels (H1 → H3)
- Headings used for styling only
- No H1 on page
Content Optimization
Primary Page Content
- Keyword in first 100 words
- Related keywords naturally used
- Sufficient depth/length for topic
- Answers search intent
- Better than competitors
Thin Content Issues
- Pages with little unique content
- Tag/category pages with no value
- Doorway pages
- Duplicate or near-duplicate content
Image Optimization
Check for:
- Descriptive file names
- Alt text on all images
- Alt text describes image
- Compressed file sizes
- Modern formats (WebP)
- Lazy loading implemented
- Responsive images
Internal Linking
Check for:
- Important pages well-linked
- Descriptive anchor text
- Logical link relationships
- No broken internal links
- Reasonable link count per page
Common issues:
- Orphan pages (no internal links)
- Over-optimized anchor text
- Important pages buried
- Excessive footer/sidebar links
Keyword Targeting
Per Page
- Clear primary keyword target
- Title, H1, URL aligned
- Content satisfies search intent
- Not competing with other pages (cannibalization)
Site-Wide
- Keyword mapping document
- No major gaps in coverage
- No keyword cannibalization
- Logical topical clusters
Content Quality Assessment
E-E-A-T Signals
Experience
- First-hand experience demonstrated
- Original insights/data
- Real examples and case studies
Expertise
- Author credentials visible
- Accurate, detailed information
- Properly sourced claims
Authoritativeness
- Recognized in the space
- Cited by others
- Industry credentials
Trustworthiness
- Accurate information
- Transparent about business
- Contact information available
- Privacy policy, terms
- Secure site (HTTPS)
Content Depth
- Comprehensive coverage of topic
- Answers follow-up questions
- Better than top-ranking competitors
- Updated and current
User Engagement Signals
- Time on page
- Bounce rate in context
- Pages per session
- Return visits
Common Issues by Site Type
SaaS/Product Sites
- Product pages lack content depth
- Blog not integrated with product pages
- Missing comparison/alternative pages
- Feature pages thin on content
- No glossary/educational content
E-commerce
- Thin category pages
- Duplicate product descriptions
- Missing product schema
- Faceted navigation creating duplicates
- Out-of-stock pages mishandled
Content/Blog Sites
- Outdated content not refreshed
- Keyword cannibalization
- No topical clustering
- Poor internal linking
- Missing author pages
Local Business
- Inconsistent NAP
- Missing local schema
- No Google Business Profile optimization
- Missing location pages
- No local content
Output Format
Audit Report Structure
Executive Summary
- Overall health assessment
- Top 3-5 priority issues
- Quick wins identified
Technical SEO Findings For each issue:
- Issue: What's wrong
- Impact: SEO impact (High/Medium/Low)
- Evidence: How you found it
- Fix: Specific recommendation
- Priority: 1-5 or High/Medium/Low
On-Page SEO Findings Same format as above
Content Findings Same format as above
Prioritized Action Plan
- Critical fixes (blocking indexation/ranking)
- High-impact improvements
- Quick wins (easy, immediate benefit)
- Long-term recommendations
References
- AI Writing Detection: Common AI writing patterns to avoid (em dashes, overused phrases, filler words)
- For AI search optimization (AEO, GEO, LLMO, AI Overviews), see the ai-seo skill
Tools Referenced
Free Tools
- Google Search Console (essential)
- Google PageSpeed Insights
- Bing Webmaster Tools
- Rich Results Test (use this for schema validation — it renders JavaScript)
- Mobile-Friendly Test
- Schema Validator
Note on schema detection:
web_fetchstrips<script>tags (including JSON-LD) and cannot detect JS-injected schema. Use the browser tool, Rich Results Test, or Screaming Frog instead — they render JavaScript and capture dynamically-injected markup. See the Schema Markup Detection Limitation section above.
Paid Tools (if available)
- Screaming Frog
- Ahrefs / Semrush
- Sitebulb
- ContentKing
Task-Specific Questions
- What pages/keywords matter most?
- Do you have Search Console access?
- Any recent changes or migrations?
- Who are your top organic competitors?
- What's your current organic traffic baseline?
Related Skills
- ai-seo: For optimizing content for AI search engines (AEO, GEO, LLMO)
- programmatic-seo: For building SEO pages at scale
- site-architecture: For page hierarchy, navigation design, and URL structure
- schema-markup: For implementing structured data
- page-cro: For optimizing pages for conversion (not just ranking)
- analytics-tracking: For measuring SEO performance
Reference documents
AI Writing Detection
Words, phrases, and punctuation patterns commonly associated with AI-generated text. Avoid these to ensure writing sounds natural and human.
Sources: Grammarly (2025), Microsoft 365 Life Hacks (2025), GPTHuman (2025), Walter Writes (2025), Textero (2025), Plagiarism Today (2025), Rolling Stone (2025), MDPI Blog (2025)
Contents
- Em Dashes: The Primary AI Tell
- Overused Verbs
- Overused Adjectives
- Overused Transitions and Connectors
- Phrases That Signal AI Writing (Opening Phrases, Transitional Phrases, Concluding Phrases, Structural Patterns)
- Filler Words and Empty Intensifiers
- Academic-Specific AI Tells
- How to Self-Check
Em Dashes: The Primary AI Tell
The em dash (—) has become one of the most reliable markers of AI-generated content.
Em dashes are longer than hyphens (-) and are used for emphasis, interruptions, or parenthetical information. While they have legitimate uses in writing, AI models drastically overuse them.
Why Em Dashes Signal AI Writing
- AI models were trained on edited books, academic papers, and style guides where em dashes appear frequently
- AI uses em dashes as a shortcut for sentence variety instead of commas, colons, or parentheses
- Most human writers rarely use em dashes because they don't exist as a standard keyboard key
- The overuse is so consistent that it has become the unofficial signature of ChatGPT writing
What To Do Instead
| Instead of | Use |
|---|---|
| The results—which were surprising—showed... | The results, which were surprising, showed... |
| This approach—unlike traditional methods—allows... | This approach, unlike traditional methods, allows... |
| The study found—as expected—that... | The study found, as expected, that... |
| Communication skills—both written and verbal—are essential | Communication skills (both written and verbal) are essential |
Guidelines
- Use commas for most parenthetical information
- Use colons to introduce explanations or lists
- Use parentheses for supplementary information
- Reserve em dashes for rare, deliberate emphasis only
- If you find yourself using more than one em dash per page, revise
Overused Verbs
| Avoid | Use Instead |
|---|---|
| delve (into) | explore, examine, investigate, look at |
| leverage | use, apply, draw on |
| optimise | improve, refine, enhance |
| utilise | use |
| facilitate | help, enable, support |
| foster | encourage, support, develop, nurture |
| bolster | strengthen, support, reinforce |
| underscore | emphasise, highlight, stress |
| unveil | reveal, show, introduce, present |
| navigate | manage, handle, work through |
| streamline | simplify, make more efficient |
| enhance | improve, strengthen |
| endeavour | try, attempt, effort |
| ascertain | find out, determine, establish |
| elucidate | explain, clarify, make clear |
Overused Adjectives
| Avoid | Use Instead |
|---|---|
| robust | strong, reliable, thorough, solid |
| comprehensive | complete, thorough, full, detailed |
| pivotal | key, critical, central, important |
| crucial | important, key, essential, critical |
| vital | important, essential, necessary |
| transformative | significant, important, major |
| cutting-edge | new, advanced, recent, modern |
| groundbreaking | new, original, significant |
| innovative | new, original, creative |
| seamless | smooth, easy, effortless |
| intricate | complex, detailed, complicated |
| nuanced | subtle, complex, detailed |
| multifaceted | complex, varied, diverse |
| holistic | complete, whole, comprehensive |
Overused Transitions and Connectors
| Avoid | Use Instead |
|---|---|
| furthermore | also, in addition, and |
| moreover | also, and, besides |
| notwithstanding | despite, even so, still |
| that being said | however, but, still |
| at its core | essentially, fundamentally, basically |
| to put it simply | in short, simply put |
| it is worth noting that | note that, importantly |
| in the realm of | in, within, regarding |
| in the landscape of | in, within |
| in today's [anything] | currently, now, today |
Phrases That Signal AI Writing
Opening Phrases to Avoid
- "In today's fast-paced world..."
- "In today's digital age..."
- "In an era of..."
- "In the ever-evolving landscape of..."
- "In the realm of..."
- "It's important to note that..."
- "Let's delve into..."
- "Imagine a world where..."
Transitional Phrases to Avoid
- "That being said..."
- "With that in mind..."
- "It's worth mentioning that..."
- "At its core..."
- "To put it simply..."
- "In essence..."
- "This begs the question..."
Concluding Phrases to Avoid
- "In conclusion..."
- "To sum up..."
- "By [doing X], you can [achieve Y]..."
- "In the final analysis..."
- "All things considered..."
- "At the end of the day..."
Structural Patterns to Avoid
- "Whether you're a [X], [Y], or [Z]..." (listing three examples after "whether")
- "It's not just [X], it's also [Y]..."
- "Think of [X] as [elaborate metaphor]..."
- Starting sentences with "By" followed by a gerund: "By understanding X, you can Y..."
Filler Words and Empty Intensifiers
These words often add nothing to meaning. Remove them or find specific alternatives:
- absolutely
- actually
- basically
- certainly
- clearly
- definitely
- essentially
- extremely
- fundamentally
- incredibly
- interestingly
- naturally
- obviously
- quite
- really
- significantly
- simply
- surely
- truly
- ultimately
- undoubtedly
- very
Academic-Specific AI Tells
| Avoid | Use Instead |
|---|---|
| shed light on | clarify, explain, reveal |
| pave the way for | enable, allow, make possible |
| a myriad of | many, numerous, various |
| a plethora of | many, numerous, several |
| paramount | very important, essential, critical |
| pertaining to | about, regarding, concerning |
| prior to | before |
| subsequent to | after |
| in light of | because of, given, considering |
| with respect to | about, regarding, for |
| in terms of | regarding, for, about |
| the fact that | that (or rewrite sentence) |
How to Self-Check
- Read your text aloud. If phrases sound unnatural in speech, revise them
- Ask: "Would I say this in a conversation with a colleague?"
- Check for repetitive sentence structures
- Look for clusters of the words listed above
- Ensure varied sentence lengths (not all similar length)
- Verify each intensifier adds genuine meaning