Check Seo

check-seo

Audit any website's SEO, suggest prioritized fixes, then auto-apply fixes to the local codebase.

When to use

Triggered by: "check SEO", "audit SEO", "fix SEO", "my SEO score", "audit https://...", "improve SEO"

Prerequisites

Check and install if missing:

seomator --version 2>/dev/null || npm install -g @seomator/seo-audit

For Core Web Vitals (optional — requires Chrome/Chromium):

npx playwright install chromium

Phase 1 — Audit

Run the audit with LLM-optimized output:

seomator audit  --format llm

Parse the XML output to extract:

• Overall score (0-100) and grade (A-F)
• Per-category scores and weights
• All issues with severity: critical, warning, info

Display a summary table:

Overall: 67/100 (D)

Category         Score  Issues
Core SEO          45    3 critical, 2 warnings
Performance       72    1 critical, 4 warnings
Security          88    0 critical, 1 warning
...

Phase 2 — Suggest

Group all issues by severity and show the top 10 prioritized by impact:

CRITICAL (fix these first):
1. [Core SEO] Missing meta description — affects click-through rate
2. [Core SEO] Title tag too long (87 chars, max 60) — truncated in SERPs
3. [Performance] No image lazy loading — hurts LCP score

WARNINGS:
4. [Security] Missing X-Frame-Options header
...

Ask the user: > "Found X critical issues and Y warnings. Fix all critical issues automatically? (yes/no/select)"

If "select", list issues numbered so user can pick which to fix.

Phase 3 — Detect Stack

From the project root, detect the tech stack:

ls next.config.* 2>/dev/null && echo "nextjs"
ls nuxt.config.* 2>/dev/null && echo "nuxt"
ls vite.config.* 2>/dev/null && echo "vite"
find . -name "*.html" -maxdepth 3 | head -5

Detection rules:

• next.config.* OR src/app/layout.tsx OR pages/_app.tsx → Next.js
• nuxt.config.* → Nuxt
• vite.config.* + index.html → Vue SPA
• *.html files, no framework → Plain HTML
• Unknown → treat as Plain HTML

Phase 4 — Fix

For each approved issue, apply the correct fix based on stack:

Next.js (App Router) fixes

Missing title / description → src/app/layout.tsx:

export const metadata: Metadata = {
  title: 'Your Page Title (50-60 chars)',
  description: 'Your meta description (120-160 chars)',
}

Missing canonical → src/app/layout.tsx:

export const metadata: Metadata = {
  alternates: { canonical: 'https://yourdomain.com' },
}

Missing OG / Twitter tags → src/app/layout.tsx:

export const metadata: Metadata = {
  openGraph: {
    title: 'Your Title',
    description: 'Your description',
    url: 'https://yourdomain.com',
    images: [{ url: '/og-image.png', width: 1200, height: 630 }],
    type: 'website',
  },
  twitter: { card: 'summary_large_image', title: 'Your Title', description: 'Your description', images: ['/og-image.png'] },
}

Missing robots.txt → create src/app/robots.ts:

import { MetadataRoute } from 'next'
export default function robots(): MetadataRoute.Robots {
  return { rules: { userAgent: '*', allow: '/' }, sitemap: 'https://yourdomain.com/sitemap.xml' }
}

Missing sitemap → create src/app/sitemap.ts:

import { MetadataRoute } from 'next'
export default function sitemap(): MetadataRoute.Sitemap {
  return [{ url: 'https://yourdomain.com', lastModified: new Date(), changeFrequency: 'monthly', priority: 1 }]
}

Structured data → add to src/app/layout.tsx:

const jsonLd = { '@context': 'https://schema.org', '@type': 'WebSite', name: 'Your Site', url: 'https://yourdomain.com' }

Missing alt text → find all ` / without alt` prop, add descriptive alt text.

Plain HTML fixes

Add to ` in the relevant .html` file:

Your Title (50-60 chars)

{"@context":"https://schema.org","@type":"WebSite","name":"Your Site","url":"https://yourdomain.com"}

Missing robots.txt → create robots.txt:

User-agent: *
Allow: /
Sitemap: https://yourdomain.com/sitemap.xml

Nuxt 3 fixes

Meta → nuxt.config.ts or per-page useSeoMeta():

useSeoMeta({ title: 'Your Title', description: 'Your description', ogTitle: 'Your Title', ogDescription: 'Your description', ogImage: '/og-image.png' })

Issue ID → Fix Map

| seomator issue id | Action | |---|---| | meta-description | Add description metadata | | title-missing | Add title metadata | | title-length | Shorten title to 50-60 chars | | canonical-missing | Add canonical link | | og-title, og-description, og-image | Add Open Graph meta | | twitter-card | Add Twitter card meta | | structured-data | Add JSON-LD schema | | robots-txt | Create robots.txt | | sitemap | Create sitemap.xml | | image-alt | Add alt attributes to images | | h1-missing | Add single H1 to page | | h1-multiple | Remove extra H1 tags | | https, gzip, core-web-vitals | Manual fix — add to report |

Rules:

• Never fix what cannot be confidently mapped to a file
• Always show before/after for each edit
• If a needed file doesn't exist, create it
• Group unmappable issues into a "Manual Fixes" section

Phase 5 — Verify

Re-run the audit after all fixes:

seomator audit  --format llm

Show score delta:

Before: 67/100 (D)
After:  84/100 (B)  ▲ +17 points

Fixed: 8 issues
Remaining manual fixes: 3 issues (see below)

Manual Fixes Report

For issues that couldn't be auto-fixed:

MANUAL FIXES REQUIRED:
1. [Performance] Enable gzip/brotli compression
   → Configure in hosting provider (nginx, vercel.json, etc.)

2. [Crawlability] Submit sitemap to Google Search Console
   → https://search.google.com/search-console

Seomator Reference

Scoring: 90-100=A, 80-89=B, 70-79=C, 50-69=D, 0-49=F

20 Audit Categories (top by weight): Core SEO (12%), Performance (12%), Links (8%), Images (8%), Security (8%), Technical SEO (7%), Crawlability (7%), Structured Data (6%), JS Rendering (6%), Accessibility (6%), Content (5%), Social (5%), E-E-A-T (4%), URL Structure (4%), Redirects (3%), Mobile (3%), and more.

Always use --format llm — 50-70% smaller than JSON, structured XML optimized for AI parsing.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: nguyenthanhtat
• Source: nguyenthanhtat/screen1-claude
• License: MIT

Install and usage instructions live in the source repository linked above.