Individual skill
canonical-url
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.
skills/canonical-url/SKILL.md
Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Not checked yet
- Last checked
- Nov 2, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.
Repository context
- Repository stars (not skill ratings)
- 74,678
- Repository last updated
- Oct 31, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- frontend Repository topic
- front-end-development Repository topic
- front-end-developer-tool Repository topic
- guidelines Repository topic
- checklist Repository topic
- reference Repository topic
- web-development Repository topic
- html Repository topic
- css Repository topic
- javascript Repository topic
- data Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
SKILL.mdcore · 1,657 bytesSKILL.mdcore · 1,657 bytesreferences/rule.mddoc · 4,655 bytes
Read excerpt
# Set canonical URLs for all pages
Duplicate content from URL parameters, www vs non-www, or pagination dilutes ranking signals—canonical tags consolidate these signals to the preferred URL.
## Quick Reference
- Canonical URLs tell search engines which version of a page to index
- Prevents duplicate content penalties from URL variations
- Use absolute URLs including protocol and domain
- Self-referencing canonicals are a best practice
## Check
Verify that this page has a canonical URL tag and that it points to the correct preferred version.