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🔎 SEO監査(技術SEO診断)

seo-audit

サイトのSEO監査・技術SEO診断・順位低下原因の特定Skill。

⏱ 競合分析レポート 3日 → 半日

📺 まず動画で見る(YouTube)

▶ 【自動化】AIガチ勢の最新活用術6選がこれ1本で丸分かり!【ClaudeCode・AIエージェント・AI経営・Skills・MCP】 ↗

※ jpskill.com 編集部が参考用に選んだ動画です。動画の内容と Skill の挙動は厳密には一致しないことがあります。

📜 元の英語説明(参考)

When the user wants to audit, review, or diagnose SEO issues on their site. Also use when the user mentions "SEO audit," "technical SEO," "why am I not ranking," "SEO issues," "on-page SEO," "meta tags review," or "SEO health check." For building pages at scale to target keywords, see programmatic-seo. For adding structured data, see schema-markup.

🇯🇵 日本人クリエイター向け解説

一言でいうと

サイトのSEO監査・技術SEO診断・順位低下原因の特定Skill。

※ jpskill.com 編集部が日本のビジネス現場向けに補足した解説です。Skill本体の挙動とは独立した参考情報です。

⚠️ ダウンロード・利用は自己責任でお願いします。当サイトは内容・動作・安全性について責任を負いません。

🎯 このSkillでできること

下記の説明文を読むと、このSkillがあなたに何をしてくれるかが分かります。Claudeにこの分野の依頼をすると、自動で発動します。

📦 インストール方法 (3ステップ)

  1. 1. 上の「ダウンロード」ボタンを押して .skill ファイルを取得
  2. 2. ファイル名の拡張子を .skill から .zip に変えて展開(macは自動展開可)
  3. 3. 展開してできたフォルダを、ホームフォルダの .claude/skills/ に置く
    • · macOS / Linux: ~/.claude/skills/
    • · Windows: %USERPROFILE%\.claude\skills\

Claude Code を再起動すれば完了。「このSkillを使って…」と話しかけなくても、関連する依頼で自動的に呼び出されます。

詳しい使い方ガイドを見る →
最終更新
2026-05-17
取得日時
2026-05-17
同梱ファイル
1

💬 こう話しかけるだけ — サンプルプロンプト

  • SEO監査(技術SEO診断) で、私のビジネスを分析して改善案を3つ提案して
  • SEO監査(技術SEO診断) を使って、来週の会議用の資料を作って
  • SEO監査(技術SEO診断) で、現状の課題を整理してアクションプランに落として

これをClaude Code に貼るだけで、このSkillが自動発動します。

📖 Claude が読む原文 SKILL.md(中身を展開)

この本文は AI(Claude)が読むための原文(英語または中国語)です。日本語訳は順次追加中。

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

Before auditing, understand:

  1. Site Context

    • What type of site? (SaaS, e-commerce, blog, etc.)
    • What's the primary business goal for SEO?
    • What keywords/topics are priorities?
  2. Current State

    • Any known issues or concerns?
    • Current organic traffic level?
    • Recent changes or migrations?
  3. Scope

    • Full site audit or specific pages?
    • Technical + on-page, or one focus area?
    • Access to Search Console / analytics?

Audit Framework

Priority Order

  1. Crawlability & Indexation (can Google find and index it?)
  2. Technical Foundations (is the site fast and functional?)
  3. On-Page Optimization (is content optimized?)
  4. Content Quality (does it deserve to rank?)
  5. 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

  1. Critical fixes (blocking indexation/ranking)
  2. High-impact improvements
  3. Quick wins (easy, immediate benefit)
  4. Long-term recommendations

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

Questions to Ask

If you need more context:

  1. What pages/keywords matter most?
  2. Do you have Search Console access?
  3. Any recent changes or migrations?
  4. Who are your top organic competitors?
  5. 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