Agent skill · marketing growth · sickn33
seo-hreflang
Hreflang and international SEO audit, validation, and generation. Detects common mistakes, validates language/region codes, and generates correct hreflang implementations. Use when user says "hreflang", "i18n SEO", "international SEO", "multi-language", "multi-region", or "language tags".
Why this skill is useful
Provides specific validation checks and generation patterns for hreflang tags that the AI wouldn't reliably generate on its own.
What it needs
About 5k tokens when loaded. Last updated 2026-08-07. 44,571 stars on the source repository.
What this skill does
Hreflang & International SEO When to Use Use when validating or generating hreflang for multilingual or multiregional sites. Use when the user mentions international SEO, language tags, x-default, or hreflang issues. Use when auditing locale alternates across HTML, headers, or sitemap implementations. Validate existing hreflang implementations or generate correct hreflang tags for multi-language and multi-region sites. Supports HTML, HTTP header, and XML sitemap implementations. Validation Checks 1. Self-Referencing Tags Every page must include an hreflang tag pointing to itself The self-referencing URL must exactly match the page's canonical URL Missing self-referencing tags cause Google to ignore the entire hreflang set 2. Return Tags If page A links to page B with hreflang, page B must link back to page A Every hreflang relationship must be bidirectional (A→B and B→A) Missing return tags invalidate the hreflang signal for both pages Check all language versions reference each other (full mesh) 3. x-default Tag Required: designates the fallback page for unmatched languages/regions Typically points to the language selector page or English version Only one x-default per set of alternates Must also have return tags from all other language versions 4. Language Code Validation Must use ISO 639-1 two-letter codes (e.g., en, fr, de, ja) Common errors: eng instead of en (ISO 639-2, not valid for hreflang) jp instead of ja (incorrect code for Japanese) zh without region qualifier (ambiguous; use zh-Hans or zh-Hant) 5. Region Code Validation Optional region qualifier uses ISO 3166-1 Alpha-2 (e.g., en-US, en-GB, pt-BR) Format: language-REGION (lowercase language, uppercase region) Common errors: en-uk instead of en-GB (UK is not a valid ISO 3166-1 code) es-LA (Latin America is not a country; use specific countries) Region without language prefix 6. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sickn33/seo-hreflang