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Use when auditing metadata, crawlability, structured data, or indexability related to Set canonical URLs for all pages. Verify the rendered HTML and HTTP response rather than relying only on source files.
Passed 23 of 23 test cases with the skill, and 22 of 23 without it.
1 fixed22 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
This benchmark measured an earlier version of the skill.
A test case the skill fixed. Same model, same prompt, with and without the skill.
During a technical SEO code review, we noticed dynamic JavaScript injecting a canonical tag after DOM load, while the raw HTTP response has no canonical header or tag. How should we verify search engine crawler perception?
| Checked | Without skill | With skill |
|---|---|---|
| Recommends inspecting rendered HTML output alongside server response headers | Missed | Passed |
The instructions your model reads when the skill loads.
Duplicate content from URL parameters, www vs non-www, or pagination dilutes ranking signals—canonical tags consolidate these signals to the preferred URL.
Verify that this page has a canonical URL tag and that it points to the correct preferred version.
Add or correct the canonical URL tag in the head section to prevent duplicate content issues.
Explain how canonical URLs help search engines understand the preferred version of duplicate or similar pages.
Review metadata generation, rendered HTML, structured data, and response headers related to Set canonical URLs for all pages. Flag exact routes or templates where search-facing output violates the rule, and describe how to verify the final page output.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/seo/canonical-url
test cases passed, vs 22 / 23 without
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