Details
Overview
SEO Technical: Canonical Skill is an open-source Agent Skill from the kostja94/marketing-skills collection (MIT). It teaches AI coding agents focused marketing / SEO workflows so they can produce production-ready guidance instead of generic advice.
Guides canonical tag configuration to consolidate duplicate content and declare preferred URLs.
Identify: 1. Site URL: Base domain 2. Duplicate scenarios: Multi-language, query params, pagination, alternate URLs 3. Framework: Next.js, React, static, etc.
Official skill id: canonical-tag. Source path: skills/seo/technical/canonical.
Key Features
- D: uplicate site versions: HTTPS vs HTTP; www vs non-www; trailing slash (/page vs /page/) — choose one, 301 redirect others
- D: uplicate content: Canonical tags; consolidate and 301 to preferred URL
- H: TTPS: SSL/TLS; secure connection; ranking signal since 2014
- M: ulti-language: Each language version has its own canonical; use hreflang with canonical
- S: ame content, multiple URLs: Params, pagination, tracking params, www vs non-www, trailing slash (/page vs /page/)
- S: elf-referencing: Canonical should point to self or the preferred version
How to Use
- Use a Skill-compatible agent such as Claude Code, Cursor, or Codex.
- Install from the terminal (Node.js required):
npx skills add https://github.com/kostja94/marketing-skills --skill canonical
Or paste the install prompt from this tool page into your agent and ask it to install for you. 3. Restart / reload the agent so the new Skill is loaded. 4. Invoke the Skill with its slash commands or by asking the agent to run the workflow described in Overview / Key Features. 5. Review outputs before publishing — treat model-generated copy, images, and data as drafts.
Pricing
| Plan | Billing | Price | Notes |
|---|---|---|---|
| Open source | — | Free | MIT license; install via npx skills add |
| Full pack | — | Free | Optional: install the entire marketing-skills repo |
No paid tiers. Check the GitHub repository for license and updates.
Best For
Marketers, indie hackers, ecommerce / SaaS founders, and SEO operators who want agents to execute a specific marketing task with structured best practices.
Trigger context from the skill author: When the user wants to configure canonical URLs, fix duplicate content, or consolidate URL signals. Also use when the user mentions "canonical," "canonical URL," "duplicate content," "duplicate content fix," "preferred URL," or "URL consolidation." For GSC duplicates, use google-search-console.
FAQ
How do I install this skill?
npx skills add https://github.com/kostja94/marketing-skills --skill canonical-tag
Or copy the skill folder into .cursor/skills/, .agents/skills/, or .claude/skills/.
Does this skill run code on my machine?
No. Skills in this collection are pure Markdown instructions for agents — no executable payloads.
Can I install only this skill instead of the full pack?
Yes. Prefer --skill canonical-tag for a single task. Install 2–3 related skills per job rather than the entire library.
Where should I add project context?
Copy templates/project-context.md from the repo into .cursor/ or .claude/ and fill in product, audience, and brand details so outputs stay tailored.