| name | seo-audit |
| version | 1.0.0 |
| description | サイトのSEO問題を監査・診断し、改善提案を行うスキル。 「SEOを監査して」「検索順位が上がらない原因を調べて」「技術SEOをチェック」等のリクエストで発動。 |
| triggers | ["SEOを監査して","検索順位が上がらない","技術SEOをチェック","SEOの問題を診断","メタタグをレビュー","seo-audit","SEO audit","technical SEO"] |
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 .claude/product-marketing-context.md exists, 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
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
- Brand name placement (end, usually)
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
Tools Referenced
Free Tools
- Google Search Console (essential)
- Google PageSpeed Insights
- Bing Webmaster Tools
- Rich Results Test
- Mobile-Friendly Test
- Schema Validator
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
- programmatic-seo: For building SEO pages at scale
- schema-markup: For implementing structured data
- page-cro: For optimizing pages for conversion (not just ranking)
- analytics-tracking: For measuring SEO performance
