Awesome-omni-skills seo-hreflang

Hreflang & International SEO workflow skill. Use this skill when the user needs > and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

install

source · Clone the upstream repo

git clone https://github.com/diegosouzapw/awesome-omni-skills

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/diegosouzapw/awesome-omni-skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/seo-hreflang" ~/.claude/skills/diegosouzapw-awesome-omni-skills-seo-hreflang && rm -rf "$T"

manifest: skills/seo-hreflang/SKILL.md

Hreflang & International SEO

Overview

This public intake copy packages

plugins/antigravity-awesome-skills-claude/skills/seo-hreflang

from

https://github.com/sickn33/antigravity-awesome-skills

into the native Omni Skills editorial shape without hiding its origin.

Use it when the operator needs the upstream workflow, support files, and repository context to stay intact while the public validator and private enhancer continue their normal downstream flow.

This intake keeps the copied upstream files intact and uses

metadata.json

plus

ORIGIN.md

as the provenance anchor for review.

Hreflang & International SEO

Imported source sections that did not map cleanly to the public headings are still preserved below or in the support files. Notable imported sections: Validation Checks, Implementation Methods, Hreflang Generation, Hreflang Sitemap Generation, Output, Error Handling.

When to Use This Skill

Use this section as the trigger filter. It should make the activation boundary explicit before the operator loads files, runs commands, or opens a pull request.

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.
Use when the request clearly matches the imported source intent: >.
Use when the operator should preserve upstream workflow detail instead of rewriting the process from scratch.
Use when provenance needs to stay visible in the answer, PR, or review packet.

Operating Table

Situation	Start here	Why it matters
First-time use	`metadata.json`	Confirms repository, branch, commit, and imported path before touching the copied workflow
Provenance review	`ORIGIN.md`	Gives reviewers a plain-language audit trail for the imported source
Workflow execution	`SKILL.md`	Starts with the smallest copied file that materially changes execution
Supporting context	`SKILL.md`	Adds the next most relevant copied source file without loading the entire package
Handoff decision	`## Related Skills`	Helps the operator switch to a stronger native skill when the task drifts

Workflow

This workflow is intentionally editorial and operational at the same time. It keeps the imported source useful to the operator while still satisfying the public intake standards that feed the downstream enhancer flow.

Confirm the user goal, the scope of the imported workflow, and whether this skill is still the right router for the task.
Read the overview and provenance files before loading any copied upstream support files.
Load only the references, examples, prompts, or scripts that materially change the outcome for the current request.
Execute the upstream workflow while keeping provenance and source boundaries explicit in the working notes.
Validate the result against the upstream expectations and the evidence you can point to in the copied files.
Escalate or hand off to a related skill when the work moves out of this imported workflow's center of gravity.
Before merge or closure, record what was used, what changed, and what the reviewer still needs to verify.

Imported Workflow Notes

Imported: 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. Canonical URL Alignment

Hreflang tags must only appear on canonical URLs
If a page has
```
rel=canonical
```
pointing elsewhere, hreflang on that page is ignored
The canonical URL and hreflang URL must match exactly (including trailing slashes)
Non-canonical pages should not be in any hreflang set

7. Protocol Consistency

All URLs in an hreflang set must use the same protocol (HTTPS or HTTP)
Mixed HTTP/HTTPS in hreflang sets causes validation failures
After HTTPS migration, update all hreflang tags to HTTPS

8. Cross-Domain Support

Hreflang works across different domains (e.g., example.com and example.de)
Cross-domain hreflang requires return tags on both domains
Verify both domains are verified in Google Search Console
Sitemap-based implementation recommended for cross-domain setups

Examples

Example 1: Ask for the upstream workflow directly

Use @seo-hreflang to handle <task>. Start from the copied upstream workflow, load only the files that change the outcome, and keep provenance visible in the answer.

Explanation: This is the safest starting point when the operator needs the imported workflow, but not the entire repository.

Example 2: Ask for a provenance-grounded review

Review @seo-hreflang against metadata.json and ORIGIN.md, then explain which copied upstream files you would load first and why.

Explanation: Use this before review or troubleshooting when you need a precise, auditable explanation of origin and file selection.

Example 3: Narrow the copied support files before execution

Use @seo-hreflang for <task>. Load only the copied references, examples, or scripts that change the outcome, and name the files explicitly before proceeding.

Explanation: This keeps the skill aligned with progressive disclosure instead of loading the whole copied package by default.

Example 4: Build a reviewer packet

Review @seo-hreflang using the copied upstream files plus provenance, then summarize any gaps before merge.

Explanation: This is useful when the PR is waiting for human review and you want a repeatable audit packet.

Best Practices

Treat the generated public skill as a reviewable packaging layer around the upstream repository. The goal is to keep provenance explicit and load only the copied source material that materially improves execution.

Keep the imported skill grounded in the upstream repository; do not invent steps that the source material cannot support.
Prefer the smallest useful set of support files so the workflow stays auditable and fast to review.
Keep provenance, source commit, and imported file paths visible in notes and PR descriptions.
Point directly at the copied upstream files that justify the workflow instead of relying on generic review boilerplate.
Treat generated examples as scaffolding; adapt them to the concrete task before execution.
Route to a stronger native skill when architecture, debugging, design, or security concerns become dominant.

Troubleshooting

Problem: The operator skipped the imported context and answered too generically

Symptoms: The result ignores the upstream workflow in

plugins/antigravity-awesome-skills-claude/skills/seo-hreflang

, fails to mention provenance, or does not use any copied source files at all. Solution: Re-open

metadata.json

ORIGIN.md

, and the most relevant copied upstream files. Load only the files that materially change the answer, then restate the provenance before continuing.

Problem: The imported workflow feels incomplete during review

Symptoms: Reviewers can see the generated

SKILL.md

, but they cannot quickly tell which references, examples, or scripts matter for the current task. Solution: Point at the exact copied references, examples, scripts, or assets that justify the path you took. If the gap is still real, record it in the PR instead of hiding it.

Problem: The task drifted into a different specialization

Symptoms: The imported skill starts in the right place, but the work turns into debugging, architecture, design, security, or release orchestration that a native skill handles better. Solution: Use the related skills section to hand off deliberately. Keep the imported provenance visible so the next skill inherits the right context instead of starting blind.

Imported Troubleshooting Notes

Imported: Common Mistakes

Issue	Severity	Fix
Missing self-referencing tag	Critical	Add hreflang pointing to same page URL
Missing return tags (A→B but no B→A)	Critical	Add matching return tags on all alternates
Missing x-default	High	Add x-default pointing to fallback/selector page
Invalid language code (e.g., `eng` )	High	Use ISO 639-1 two-letter codes
Invalid region code (e.g., `en-uk` )	High	Use ISO 3166-1 Alpha-2 codes
Hreflang on non-canonical URL	High	Move hreflang to canonical URL only
HTTP/HTTPS mismatch in URLs	Medium	Standardize all URLs to HTTPS
Trailing slash inconsistency	Medium	Match canonical URL format exactly
Hreflang in both HTML and sitemap	Low	Choose one method (sitemap preferred for large sites)
Language without region when needed	Low	Add region qualifier for geo-targeted content

Related Skills

```
@00-andruia-consultant-v2
```
- Use when the work is better handled by that native specialization after this imported skill establishes context.
```
@10-andruia-skill-smith-v2
```
- Use when the work is better handled by that native specialization after this imported skill establishes context.
```
@20-andruia-niche-intelligence-v2
```
- Use when the work is better handled by that native specialization after this imported skill establishes context.
```
@2d-games
```
- Use when the work is better handled by that native specialization after this imported skill establishes context.

Additional Resources

Use this support matrix and the linked files below as the operator packet for this imported skill. They should reflect real copied source material, not generic scaffolding.

Resource family	What it gives the reviewer	Example path
`references`	copied reference notes, guides, or background material from upstream	`references/n/a`
`examples`	worked examples or reusable prompts copied from upstream	`examples/n/a`
`scripts`	upstream helper scripts that change execution or validation	`scripts/n/a`
`agents`	routing or delegation notes that are genuinely part of the imported package	`agents/n/a`
`assets`	supporting assets or schemas copied from the source package	`assets/n/a`

Imported Reference Notes

Imported: Implementation Methods

Method 1: HTML Link Tags

Best for: Sites with <50 language/region variants per page.

<link rel="alternate" hreflang="en-US" href="https://example.com/page" />
<link rel="alternate" hreflang="en-GB" href="https://example.co.uk/page" />
<link rel="alternate" hreflang="fr" href="https://example.com/fr/page" />
<link rel="alternate" hreflang="x-default" href="https://example.com/page" />

Place in

<head>

section. Every page must include all alternates including itself.

Method 2: HTTP Headers

Best for: Non-HTML files (PDFs, documents).

Link: <https://example.com/page>; rel="alternate"; hreflang="en-US",
      <https://example.com/fr/page>; rel="alternate"; hreflang="fr",
      <https://example.com/page>; rel="alternate"; hreflang="x-default"

Set via server configuration or CDN rules.

Method 3: XML Sitemap (Recommended for large sites)

Best for: Sites with many language variants, cross-domain setups, or 50+ pages.

See Hreflang Sitemap Generation section below.

Method Comparison

Method	Best For	Pros	Cons
HTML link tags	Small sites (<50 variants)	Easy to implement, visible in source	Bloats `<head>` , hard to maintain at scale
HTTP headers	Non-HTML files	Works for PDFs, images	Complex server config, not visible in HTML
XML sitemap	Large sites, cross-domain	Scalable, centralized management	Not visible on page, requires sitemap maintenance

Imported: Hreflang Generation

Process

Detect languages: Scan site for language indicators (URL path, subdomain, TLD, HTML lang attribute)
Map page equivalents: Match corresponding pages across languages/regions
Validate language codes: Verify all codes against ISO 639-1 and ISO 3166-1
Generate tags: Create hreflang tags for each page including self-referencing
Verify return tags: Confirm all relationships are bidirectional
Add x-default: Set fallback for each page set
Output: Generate implementation code (HTML, HTTP headers, or sitemap XML)

Imported: Hreflang Sitemap Generation

Sitemap with Hreflang

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:xhtml="http://www.w3.org/1999/xhtml">
  <url>
    <loc>https://example.com/page</loc>
    <xhtml:link rel="alternate" hreflang="en-US" href="https://example.com/page" />
    <xhtml:link rel="alternate" hreflang="fr" href="https://example.com/fr/page" />
    <xhtml:link rel="alternate" hreflang="de" href="https://example.de/page" />
    <xhtml:link rel="alternate" hreflang="x-default" href="https://example.com/page" />
  </url>
  <url>
    <loc>https://example.com/fr/page</loc>
    <xhtml:link rel="alternate" hreflang="en-US" href="https://example.com/page" />
    <xhtml:link rel="alternate" hreflang="fr" href="https://example.com/fr/page" />
    <xhtml:link rel="alternate" hreflang="de" href="https://example.de/page" />
    <xhtml:link rel="alternate" hreflang="x-default" href="https://example.com/page" />
  </url>
</urlset>

Key rules:

Include the
```
xmlns:xhtml
```
namespace declaration
Every
```
<url>
```
entry must include ALL language alternates (including itself)
Each alternate must appear as a separate
```
<url>
```
entry with its own full set
Split at 50,000 URLs per sitemap file

Imported: Output

Hreflang Validation Report

Summary

Total pages scanned: XX
Language variants detected: XX
Issues found: XX (Critical: X, High: X, Medium: X, Low: X)

Validation Results

Language	URL	Self-Ref	Return Tags	x-default	Status
en-US	https://...	✅	✅	✅	✅
fr	https://...	❌	⚠️	✅	❌
de	https://...	✅	❌	✅	❌

Generated Hreflang Tags

HTML
```
<link>
```
tags (if HTML method chosen)
HTTP header values (if header method chosen)
```
hreflang-sitemap.xml
```
(if sitemap method chosen)

Recommendations

Missing implementations to add
Incorrect codes to fix
Method migration suggestions (e.g., HTML to sitemap for scale)

Imported: Error Handling

Scenario	Action
URL unreachable (DNS failure, connection refused)	Report the error clearly. Do not guess site structure. Suggest the user verify the URL and try again.
No hreflang tags found	Report the absence. Check for other internationalization signals (subdirectories, subdomains, ccTLDs) and recommend the appropriate hreflang implementation method.
Invalid language/region codes detected	List each invalid code with the correct replacement. Provide a corrected hreflang tag set ready to implement.

Imported: Limitations

Use this skill only when the task clearly matches the scope described above.
Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.