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Canonical Chain

Testing & Quality
canonical-chain

Canonical Chain is an Agent Skill for testing & quality published in the thedaviddias/Front-End-Checklist repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Use when auditing metadata, crawlability, structured data, or indexability related to Avoid redirect chains on canonical URLs. Verify the rendered HTML and HTTP response rather than relying only on source files.

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How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy and paste the prompt below.
  3. Review files and risks before approving any action.
Prompt to paste
Inspect the Agent Skill at https://github.com/thedaviddias/Front-End-Checklist/blob/HEAD/skills/canonical-chain/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/canonical-chain, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

Avoid redirect chains on canonical URLs

Canonical chains confuse search engines and can result in the wrong version of a page being indexed, while also adding unnecessary latency for crawlers.

Quick Reference

  • Ensure that the URL in your rel="canonical" tag returns a 200 OK status
  • Never point a canonical tag to a URL that then redirects to another location
  • Verify that the canonical URL is the final, intended version of the content

Check

Verify that the canonical URL of the page does not result in any redirects.

Fix

Update the <link rel="canonical"> tag to point directly to the final, non-redirecting URL.

Explain

Explain why pointing a canonical tag to a redirecting URL weakens the canonical-url signal and impacts SEO.

Code Review

Review metadata generation, rendered HTML, structured data, and response headers related to Avoid redirect chains on canonical URLs. Flag exact routes or templates where search-facing output violates the rule, and describe how to verify the final page output.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/seo/canonical-chain