# SEO Audit Skill

> Run a full SEO audit to find crawl errors, on-page gaps, and international issues—then get an actionable plan to boost rankings.

- Canonical: https://nanoskill.ai/zh/skills/seo-audit-agent-skill
- Markdown: https://nanoskill.ai/zh/skills/seo-audit-agent-skill.md
- Author: coreyhaines31
- Published: 2026-08-31T03:30:00.000Z
- Updated: 2026-09-01T04:30:47.997Z
- Language: zh-CN
- Source type: github
- Popularity signal: 35651

## Sources

- https://github.com/coreyhaines31/marketingskills/blob/main/skills/seo-audit

## Install

```shell
npx skills add https://github.com/coreyhaines31/marketingskills/blob/main/skills/seo-audit
```

## About

The SEO Audit skill gives marketing teams, site owners, and developers a complete search optimization health check. Whether you notice a traffic drop, want to fix technical errors, or simply keep your site in top shape, the skill runs through crawlability, on‑page factors, content quality, and international settings to deliver a clear, prioritized action plan—so you can improve rankings and organic visibility without guesswork.

Unlike basic checklists, this skill adapts to your site type—SaaS, e‑commerce, blog, or multilingual—and flags issues unique to each. It goes beyond titles and meta tags to inspect hreflang errors, canonical conflicts, E‑E‑A‑T signals, and Core Web Vitals. You get evidence-backed recommendations with exact fix steps, not just generic advice.

Use it during site migrations, regular quarterly audits, or after Google updates to diagnose what went wrong. For agencies, it standardizes audits across clients; for in‑house teams, it cuts hours of manual checking. Simply ask for an SEO audit and the skill will ask a few scoping questions before diving into the most impactful fixes first.

## Key features

- **Technical SEO Audit**: Identify crawl errors, indexation problems, and speed blockers that prevent search engines from accessing your pages.
- **On‑Page Analysis**: Get recommendations for title tags, meta descriptions, heading structure, and keyword alignment to improve on‑page relevance.
- **Content Quality & E‑E‑A‑T**: Evaluate content depth, originality, expertise signals, and duplicate content risks to meet Google’s quality standards.
- **International SEO Check**: Catch hreflang misconfigurations, canonical conflicts, and thin locale pages that hurt multilingual site visibility.
- **Prioritized Action Report**: Receive a ranked list of fixes—from critical blocking issues to quick wins—so you know exactly where to start.

## Use cases

- **SaaS Product Page Audit**: Marketing teams audit feature pages and comparison content to lift organic sign‑ups.
- **E‑Commerce Category Cleanup**: Store owners fix thin categories, duplicate descriptions, and faceted navigation issues that suppress rankings.
- **Blog Content Recovery**: Publishers uncover keyword cannibalization and refresh outdated posts to regain lost traffic.
- **Multilingual Site Validation**: Webmasters correct hreflang errors and ensure all locales index properly for global audiences.

## Result preview

See a comprehensive SEO health assessment about NanoSkill with technical and on-page insights, prioritized optimization opportunities, and a clear action plan generated by this Agent Skill.

![the demo of SEO Audit Skill](https://file.nanoskill.ai/seo-audit-agent-skill-demo-1.png)

![the demo of SEO Audit Skill](https://file.nanoskill.ai/seo-audit-agent-skill-demo-2.png)

![the demo of SEO Audit Skill](https://file.nanoskill.ai/seo-audit-agent-skill-demo-3.png)

![the demo of SEO Audit Skill](https://file.nanoskill.ai/seo-audit-agent-skill-demo-4.png)

## Result walkthrough

### Install

Add the SEO Audit Skill to your AI agent.

![a simple demonstration of the first step in using SEO Audit Skill](https://file.nanoskill.ai/seo-audit-agent-skill-step-1.png)

### Describe Task

Provide a website URL and your SEO goals to assess its technical, on-page, content, and international SEO health.

![a simple demonstration of the second step in using SEO Audit Skill](https://file.nanoskill.ai/seo-audit-agent-skill-step-2.png)

### Audit & Optimize

Get a comprehensive SEO assessment with strengths, optimization opportunities, and a prioritized action plan.

![a simple demonstration of the third step in using SEO Audit Skill](https://file.nanoskill.ai/seo-audit-agent-skill-step-3.png)

## Skill definition

# 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.md` exists (or `.claude/product-marketing.md`, or the legacy `product-marketing-context.md` filename, 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:

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

### 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:**
1. **Browser tool** — render the page and run: `document.querySelectorAll('script[type="application/ld+json"]')`
2. **Google Rich Results Test** — https://search.google.com/test/rich-results
3. **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
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

---

## International SEO & Localization

Check when the site serves multiple languages or regions. Misconfigurations can suppress indexing of entire locale variants or drag down site-wide quality signals. See [International SEO reference](references/international-seo.md) for evidence and source URLs.

### Hreflang

Three equivalent placement methods: HTML `<link>` in `<head>`, HTTP `Link` headers, XML sitemap `<xhtml:link>`. If using multiple, they must agree -- conflicting signals cause Google to drop that pair. For 10+ locales, prefer sitemap-based (no page weight, no per-request cost).

**Check for:**
- Self-referencing entry on every page (page must include itself in the hreflang set)
- Reciprocal links (if A points to B, B must point back to A -- or both are ignored)
- Valid codes: ISO 639-1 language + optional ISO 3166-1 Alpha 2 region (e.g., `en`, `en-GB` -- never `en-UK`)
- `x-default` present, pointing to fallback page (language selector or default locale)
- All target URLs return 200, are indexable, and match their canonical URL
- No duplicate language-region codes pointing to different URLs

**Common errors:** Missing self-referencing entry (all hreflang ignored). No return tag / one-directional (pair dropped). Invalid codes like `en-UK` (use `en-GB`). Hreflang target is non-canonical, 404, or blocked (cluster discarded). HTML and sitemap annotations disagree (conflicting pair dropped).

**At scale:** `<xhtml:link>` children don't count toward 50K URL sitemap limit, but the 50MB file size limit becomes the bottleneck (plan 2K-5K URLs per file with full hreflang). Focus hreflang on pages receiving wrong-language traffic -- not required on every page. For Bing: supplement with `<html lang>` and `<meta http-equiv="content-language">` (Bing treats hreflang as a weak signal).

### Canonicalization for Multilingual Sites

- Each locale page must self-canonical (e.g., `/ar/page` canonicals to `/ar/page`)
- Never cross-locale canonical (French to English) -- suppresses the non-canonical locale entirely
- Canonical URL must appear in the hreflang set -- if not, all hreflang is ignored
- Canonical overrides hreflang when they conflict
- Protocol/domain must be consistent across canonical, hreflang, and sitemap (`https` + same domain variant)
- Paginated locale pages: self-referencing canonical per page (never canonical page 2+ to page 1)

**Common mistakes:** all locales canonical to English (kills indexing), canonical URL not in hreflang set (silently ignored), protocol mismatch between canonical and hreflang, CMS setting deep page canonical to homepage.

### International Sitemaps

**Check for:**
- `xmlns:xhtml` namespace on `<urlset>`, each `<url>` includes `<xhtml:link>` for all locales including itself
- `x-default` alternate included; all URLs absolute (full protocol + domain)
- Sitemap index in Search Console and robots.txt; split by content type, not by locale

**Next.js caveat:** `alternates.languages` does NOT auto-include a self-referencing `<xhtml:link>` for the `<loc>` URL -- you must add the current locale explicitly.

### Locale URL Structure

**Recommended:** Subdirectories (`/en/`, `/ar/`). **Acceptable:** Subdomains or ccTLDs. **Not recommended:** URL parameters (`?lang=en`).

**Check for:**
- Consistent locale prefix strategy; all locales prefixed (hiding locale from URLs prevents Google from distinguishing versions)
- Root URL handled as `x-default` with redirect, or serves default locale content
- No IP/Accept-Language content negotiation (Googlebot: US IPs, no Accept-Language header)
- Trailing slash + case consistency across locale paths, canonicals, hreflang, and sitemaps
- 301 redirects from non-canonical format to canonical

**Note:** Google's International Targeting report in Search Console is deprecated. Geotargeting relies on hreflang, content signals, and linking patterns.

### Content Quality Across Locales

**Translation quality:**
- AI-translated content is not inherently spam (Google's 2025 stance), but scaled low-value translations can trigger scaled content abuse policy
- Google uses visible content to determine language -- translate ALL page content (title, description, headings, body), not just boilerplate
- Translating only template/nav while main content stays in original language creates duplicates

**Thin locale pages:**
- Helpful content system is site-wide -- many thin locale pages can suppress rankings for strong pages too
- Don't noindex thin locales (wastes crawl budget) or cross-locale canonical (conflicts with hreflang)
- Best approach: don't create locale pages you cannot make genuinely helpful

**Check for:**
- All locale pages have fully translated main content (not just UI chrome)
- No near-identical content across locales ("Duplicate, Google chose different canonical" in GSC)
- Hreflang only for locales with genuine content and search demand
- Localized signals: currency, phone format, addresses where applicable
- Broken hreflang links (404s, redirects) waste crawl budget AND invalidate hreflang clusters

---

## 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

### Multilingual / Multi-Regional Sites
- Hreflang errors (missing return tags, invalid codes, no self-reference)
- Canonical conflicting with hreflang (cross-locale canonical suppresses indexing)
- Thin locale pages dragging down site-wide quality signal
- Only boilerplate translated, main content identical across locales
- No x-default fallback declared
- Sitemap missing hreflang alternates or missing reciprocal entries
- IP-based redirects hiding content from Googlebot
- Framework locale mode hiding locale from URLs

### 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

---

## References

- [AI Writing Detection](references/ai-writing-detection.md): Common AI writing patterns to avoid (em dashes, overused phrases, filler words)
- [International SEO](references/international-seo.md): Evidence and sources for hreflang, canonical + i18n, sitemaps, URL structure, and content quality across locales
- 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_fetch` strips `<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

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

- **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**: For implementing structured data
- **cro**: For optimizing pages for conversion (not just ranking)
- **analytics**: For measuring SEO performance

## FAQ

### What is an SEO audit skill?

It’s an AI-powered assistant that performs a complete search engine optimization audit—covering technical, on‑page, content, and international factors—then delivers a prioritized report with actionable fixes.

### How do I start an audit with this skill?

Mention you want an SEO audit, or share your site’s URL. The skill will first understand your goals, then analyze crawlability, indexation, speed, on‑page elements, content quality, and more.

### Is this skill free to use?

Yes, the skill is open‑source and free. You only need access to the AI environment that runs it (like Claude Code or a compatible terminal).

### Does it integrate with Google Search Console?

The audit can reference Search Console data if you provide it, but it does not connect directly. The skill will guide you on what to check in Search Console.

### Can it detect schema markup?

Direct detection is limited because many sites load schema via JavaScript. The skill recommends using the Rich Results Test or Screaming Frog for accurate schema validation.

### Will this skill modify my website?

No, the skill only analyzes and suggests fixes. It does not make any changes to your site—you implement the recommendations manually or with your development team.