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Guide · Agent skill

How to use the Canonical Chain Auditor agent skill

Updated · written with AI from the project's own documentation and checked against our catalogue data

The canonical-chain skill teaches an AI agent to check one SEO rule from the Front-End Checklist: a page's canonical tag should point directly to a URL that loads without redirecting. This guide explains what the skill does, how to install it, how to ask for an audit in plain language, and what it needs to work well. It is written for readers who have never used an agent skill before.

Canonical Chain Auditorthedaviddias/Front-End-Checklist · MIT

Quick start

  1. 1Download the ZIP. Download the canonical-chain ZIP from this page.
  2. 2Unzip into a skills folder. Unzip it into ~/.claude/skills/ for personal use, or into your project's .claude/skills/ folder for one project.
  3. 3Or upload in the Claude apps. If you use the Claude apps, upload the skill under Settings → Capabilities → Skills.
  4. 4Make a natural request. Ask the agent to check canonical tags for redirect chains, naming the pages or templates and the concern.
  5. 5Provide pages or code. Give the agent access to live URLs or the source files that generate your pages, since it needs network access for live checks.
  6. 6Review the findings. Check each flagged canonical, its redirect destination and the suggested final URL before making changes.

What is an agent skill, and what does canonical-chain make the agent do?

An agent skill is a folder of instructions that an AI agent can load when a task matches the skill's description. The canonical-chain skill is one such folder. Its main file, SKILL.md, tells the agent to audit metadata, crawlability, structured data and indexability for one specific problem: canonical URLs that redirect elsewhere.

The canonical tag (a link element in the page head) tells search engines which URL is the main version of a page. If that URL then redirects to another address, the signal is weakened and search engines may index the wrong version. The skill asks the agent to flag these cases and suggest pointing the tag to the final address.

  • Checks the rendered HTML, structured data and HTTP response headers, not only source files.
  • Flags canonical URLs that redirect to another location.
  • Suggests updating the canonical tag to the final, non-redirecting URL.
  • Points the agent to references/rule.md for fuller implementation detail.

How do you install the canonical-chain skill?

Download the canonical-chain ZIP from this page and unzip it. You can install it in one of two ways. For a personal setup that applies to all your projects, unzip it into ~/.claude/skills/. For a single project, unzip it into that project's .claude/skills/ folder.

If you use the Claude apps, you can instead upload the skill under Settings → Capabilities → Skills.

  • Personal install: place the canonical-chain folder inside ~/.claude/skills/.
  • Project install: place the canonical-chain folder inside the project's .claude/skills/ folder.
  • Claude apps: upload the skill under Settings → Capabilities → Skills.

How do you trigger the skill with a natural request?

You do not need a special command. The agent decides to use the skill when your request matches its description, which covers auditing metadata, crawlability, structured data or indexability related to redirect chains on canonical URLs. Name the problem in plain words and give the agent access to the pages or code.

Good requests name the site or template and the symptom. Give the agent a URL or the files that generate your pages, and say what you are worried about.

  • "Check whether the canonical tags on our product pages point to URLs that redirect."
  • "We migrated URLs last month. Audit the canonical tags on the new pages for redirect chains."
  • "Review our page template for canonical tags that point to redirecting addresses, and tell me the routes affected."

What does a good audit look like?

The skill asks the agent to verify the final page output rather than trust the source code alone. A canonical tag can look correct in a template and still point to a URL that redirects in production, so the agent is expected to check live responses where it can.

For each problem, the agent should report the page or template, the canonical URL it found, where that URL redirects, and the suggested replacement. The rule's own example shows the pattern: a canonical pointing to a redirecting page-a should instead point to the final page-b.

  • Canonical URL found in the rendered HTML.
  • HTTP response for that URL, including any redirect.
  • The final destination the canonical should point to.
  • The template or route responsible, if the agent can identify it.
<link rel="canonical" href="http://example.com/page-b">

What does the skill need to work?

The skill lists no required tools or packages. It does use the network, so the agent needs a way to fetch live pages or responses. The skill itself contains no scripts, so nothing in the folder runs on your machine.

Without network access, the agent can only read source files. The skill warns that source files alone are not sufficient, so treat results from a source-only review as a starting point rather than a finished audit.

  • No listed requirements.
  • Network access is needed for live response checks.
  • No scripts are included in the skill.

What are the safety notes for scripts and network access?

Because the skill runs no scripts, it does not execute code from the folder. Its network use is limited to what the agent needs to fetch pages and check responses. Before you give an agent access to a production site, confirm that you are comfortable with it requesting your URLs.

Review the SKILL.md and references/rule.md files yourself if you want to see exactly what the agent is told to do.

  • No scripts are included or run.
  • The skill uses the network, so only point it at sites you are allowed to request.
  • Read SKILL.md and references/rule.md before installing if you want full transparency.

What tips help you get better audits?

Give the agent specific scope. A single template or a list of URLs produces clearer findings than a whole site with no context. If you suspect a migration problem, include the old and new URL patterns so the agent can compare them.

Ask for the fix as well as the finding. The skill's fix guidance is to point the canonical tag directly to the final non-redirecting URL, so you can ask the agent to propose that change in your template.

  • Narrow the scope to a template, route group or URL list.
  • Include old and new URL patterns after a migration or URL change.
  • Ask for both the flagged routes and the suggested canonical replacement.
  • Check flagged issues with a live request before changing templates.

What people use it for

  • Auditing product or category templates for canonical tags that point to redirecting URLs.
  • Checking the new URLs after a site migration to confirm canonicals reach the final version.
  • Reviewing metadata generation code to find routes that output redirecting canonical links.
  • Confirming that a page's canonical URL returns a 200 OK status.

Frequently asked questions

How do I install the canonical-chain agent skill?

Download the ZIP from this page and unzip it into ~/.claude/skills/ for personal use, or into a project's .claude/skills/ folder. In the Claude apps, you can upload it under Settings → Capabilities → Skills instead.

Does the canonical-chain skill need any software to run?

The skill lists no required tools and includes no scripts. It does use the network, so the agent needs a way to fetch live pages for a full check.

Is the canonical-chain skill free?

The skill is released under the MIT licence, as listed on this page. The source page does not state pricing beyond that.

What is a canonical chain?

A canonical chain happens when a page's canonical tag points to a URL that then redirects to another address. The skill's guidance is that this can cause search engines to index the wrong version of a page and adds unnecessary latency for crawlers.

Can the skill scan my whole site automatically?

No. The skill is not a tested crawler. The agent reasons about the pages or code you provide and needs access to live responses for a reliable result.

Why does the agent need to check live responses instead of just the source files?

A canonical tag in source code can differ from what is rendered or what the server returns after redirects. The skill asks the agent to verify the rendered HTML and HTTP response, because source files alone are not sufficient.

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Our verdict

Use canonical-chain if you are a web developer or SEO specialist reviewing templates, or a site owner who suspects search engines are indexing the wrong URL after a migration. Pick a dedicated crawler or a tested SEO tool if you need a one-click site scan with repeatable, script-based results, or if the agent cannot reach live pages.

Download the skill