# SEO Technical
> When to activate: SEO, meta tags, structured data, JSON-LD, sitemap, robots.txt, OpenGraph, canonical, hreflang, Core Web Vitals
- Skill: `mattakushi432/seo-technical` (Agent Skill)
- Install (CLI): `npx skillmds@latest add mattakushi432/seo-technical`
- Raw SKILL.md: https://api.skillmd.com/api/skills/mattakushi432/seo-technical/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Marketing & Growth
- Author: Mattakushi432 (https://skillmd.com/u/mattakushi432)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/mattakushi432/seo-technical
---
# Technical SEO Patterns
## Essential Meta Tags
```html
Page Title — Brand (50-60 chars)
```
## Structured Data (JSON-LD)
```html
```
## Sitemap
```xml
https://example.com/
2024-01-20
weekly
1.0
```
## robots.txt
```
User-agent: *
Allow: /
Disallow: /admin/
Disallow: /api/
Disallow: /*.json$
Crawl-delay: 1
Sitemap: https://example.com/sitemap.xml
```
## Hreflang (Multilingual)
```html
```
## Next.js Metadata API
```tsx
// app/page.tsx
import { Metadata } from 'next';
export const metadata: Metadata = {
title: { default: 'Brand', template: '%s | Brand' },
description: 'Site description',
openGraph: { images: [{ url: '/og.jpg', width: 1200, height: 630 }] },
robots: { index: true, follow: true },
alternates: { canonical: 'https://example.com/page/' },
};
```
## Core Web Vitals SEO Impact
- LCP > 4s → ranking penalty — optimize hero image, TTFB
- CLS > 0.25 → ranking penalty — reserve layout space
- INP > 500ms → ranking penalty — reduce JS blocking