fusengine/agents/seo-hreflang

Claude Code and agent skill by fusengine/agents

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Use when auditing or generating hreflang tags for i18n/multilingual SEO.

Install

npx vskill@latest install fusengine/agents/seo-hreflang

SKILL.md

<objective> Audits or generates hreflang across all three implementation surfaces — HTML <link> tags, HTTP headers, and XML sitemap <xhtml:link> entries — validating self-referencing, return tags, x-default, and ISO 639-1 + ISO 3166-1 code correctness via scripts/parse-hreflang.ts. Lists the common mistakes: missing self-reference, missing return tags, invalid region codes (en-UK vs en-GB), HTTP/HTTPS mismatch between alternates, and trailing-slash inconsistency. </objective>

Hreflang / i18n SEO

Workflow

  1. Detect hreflang tags (HTML <link>, HTTP header, or XML sitemap)
  2. Run scripts/parse-hreflang.ts → validate
  3. Check self-referencing, return tags, x-default
  4. Verify language/region codes (ISO 639-1 + ISO 3166-1)

Common Mistakes

  • ❌ Missing self-reference (<link rel="alternate" hreflang="fr" href="/fr/"> from /fr/)
  • ❌ Missing return tags (A → B but not B → A)
  • ❌ Invalid codes (en-UK instead of en-GB)
  • ❌ HTTP/HTTPS mismatch between alternates
  • ❌ Mixing trailing slashes

Implementation Options

  1. HTML head: <link rel="alternate" hreflang="fr-FR" href="https://example.com/fr/">
  2. HTTP Header: Link: <https://example.com/fr/>; rel="alternate"; hreflang="fr-FR"
  3. XML Sitemap: <xhtml:link rel="alternate" hreflang="fr-FR" href="https://example.com/fr/"/>

x-default

Required for international landing/locale selector pages:

html
<link rel="alternate" hreflang="x-default" href="https://example.com/">

Security

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Source

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