URL Stability

URL Stability checks whether a page links to clean, stable URLs that AI crawlers can de-duplicate and cite reliably. friendly4AI samples up to 20 anchor (<a href>) links on the page, scores each one for "cleanliness", and checks for a <link rel="canonical"> in the head. A page scores 100 only when at least 8 of those sampled URLs are clean and a canonical link exists.

What does URL Stability measure?

Two signals on a single page:

• Anchor URL cleanliness. friendly4AI samples up to 20 <a href> links and scores each. A URL counts as clean when it has no query string, or when it's a mailto:/tel: link. If it does carry a query string, that query has to contain no utm_ or session tokens, stay under 80 characters, and use no more than two & parameter separators.
• Canonical presence. Whether the page declares a <link rel="canonical"> in its head.

Why do stable URLs matter for AI-readiness?

Clean, predictable URLs let AI crawlers de-duplicate, cache, and cite pages reliably. URLs stuffed with utm_ campaign tags or session IDs look unstable: the same content shows up under many addresses, which splits authority and leaves engines guessing about which version to rank. A canonical link names the authoritative URL, so AI systems and search engines fold their signals onto one address instead of scattering them. The signal works alongside page-metadata and structured-data as part of discovery.

How is URL Stability scored?

Under the v4.5 methodology, this Discovery parameter scores in three tiers from a sample of up to 20 anchor links:

| Tier | Score | Condition | |------|-------|-----------| | Pass | 100 | At least 8 sampled URLs are clean and a canonical link is present (both required) | | Partial | 50 | At least 4 sampled URLs are clean (canonical link not required) | | Fail | 0 | Fewer than 4 clean URLs found |

The cleanliness test runs per URL. A link with no query string passes outright. A link with a query string has to clear three checks: no utm_/session tokens, under 80 characters, and two & separators or fewer.

How do I fix URL Stability issues?

• Use short, descriptive, path-based URLs in place of long query strings.
• Strip utm_ campaign parameters and session IDs out of internal links. Handle tracking client-side rather than baking it into the href.
• Add a <link rel="canonical"> to every page. Without one you can't reach the Pass tier, no matter how clean the links are.
• Keep any query string you can't avoid under 80 characters and down to two parameters or fewer.
• Start with your navigation and footer URLs, since the sample draws from on-page anchors and those links repeat everywhere.
• Re-scan after cleaning internal links to confirm the clean-URL count and the canonical are both detected. For related signals, see sitemap-availability.