# Canonical

> Declare an absolute canonical URL

- Skill: `whiteknightonhorse/canonical` (Agent Skill)
- Install (CLI): `npx skillmds@latest add whiteknightonhorse/canonical`
- Raw SKILL.md: https://api.skillmd.com/api/skills/whiteknightonhorse/canonical/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: whiteknightonhorse (https://skillmd.com/u/whiteknightonhorse)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/whiteknightonhorse/canonical

---

# Declare an absolute canonical URL

> AIPUSH agent skill · Category: Content Structure · Slug: `canonical`

Canonical URLs consolidate duplicate/variant URLs so engines index and cite the single correct version — avoiding split signals and wrong citations.

## Why it matters

Canonical URLs consolidate duplicate/variant URLs so engines index and cite the single correct version — avoiding split signals and wrong citations.

## How to detect

Check for `<link rel="canonical" href="https://...">` with an absolute URL in the head.

## How to implement

```html
<link rel="canonical" href="https://YOURDOMAIN/page">
```

Use the absolute, preferred URL (correct protocol, host, and path). One canonical per page.

## How to verify

Rendered HTML contains an absolute `rel=canonical` link.

## References

- https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls

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Part of the [AIPUSH agent skills catalog](https://aipush.app/.well-known/agent-skills/index.json). Scan your site free at https://aipush.app.