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canonical-tag SKILL.md skillA

canonical-tag from kostja94/marketing-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add kostja94/marketing-skills/canonical-tag@v1.1.0

Pins v1.1.0 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: kostja94/marketing-skills
Path: skills/seo/technical/canonical/SKILL.md
Versions recorded: 7
Latest version: v1.1.0, committed Oct 26, 2026
First version recorded: Feb 28, 2026
Size: 7,553 bytes
Repository stars: 1,089
License: MIT

Audit and fix duplicate-page canonicalization across protocol, host, slash, default-document, extension, case, and tracking-parameter URL variants. Use for canonical URLs, duplicate content, preferred URLs, URL consolidation, or conflicting canonical signals. For URL naming and hierarchy design, use url-structure.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# SEO Technical: Canonicalization

Determine the preferred URL for each page identity, consolidate duplicate variants, and verify that redirects, canonical annotations, internal links, sitemaps, and localization signals agree.

## Scope

Treat these as one duplicate-page canonicalization problem when they expose the same or substantially similar primary content:

- HTTP and HTTPS;
- www and non-www hosts, including combined protocol/host variants;
- trailing-slash and non-trailing-slash paths;
- repeated path slashes such as `/docs//guide`;
- directory defaults such as `/docs/` and `/docs/index.html`;
- historical extensions such as `/guide.html` and `/guide`;
- case variants such as `/Guide` and `/guide`;
- UTM and other tracking parameters that do not change primary content.

Do not assume that similar-looking URLs are duplicates. Case, parameters, extensions, and slash behavior can identify different resources. Compare response behavior, primary content, and project intent before consolidating.

## Inputs and Context
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add kostja94/marketing-skills/canonical-tag@sha256:3023abf3e9f8c95b

The line at the top of this page pins the label v1.1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_wv2f5yse3zxbsxef.svg)](https://markdownregistry.com/a/art_wv2f5yse3zxbsxef)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 7 versions of this file, between Feb 28, 2026 and Oct 26, 2026, about one every 40 days.

version	committed	commit	size	audit
v1.1.0 latest	2026-10-26	45143a7	7,553 B	A	view · diff
v1.0.1	2026-09-25	03671b1	4,832 B	A	view · diff
v1.0.1	2026-03-27	f1ec9f7	4,731 B	A	view · diff
v1.0.0	2026-03-11	5cca54d	4,684 B	A	view · diff
v1.0.0	2026-03-11	9abc679	4,714 B	A	view · diff
v1.0.0	2026-02-28	b615388	3,876 B	A	view · diff
v1.0.0	2026-02-28	f71005e	3,834 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (7553 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

kostja94/marketing-skills · 1,089 stars · license MIT · pushed 2026-11-06 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_wv2f5yse3zxbsxef
GET https://markdownregistry.com/api/v1/resolve?ref=kostja94/marketing-skills/canonical-tag
GET https://markdownregistry.com/api/v1/blob/3023abf3e9f8c95ba31d55f58d8045f26f3779f7d6f0e09a4344029fd841d260

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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