Individual skill
canonical-header
Use when auditing metadata, crawlability, structured data, or indexability related to Sync HTML canonical tags and Link headers. Verify the rendered HTML and HTTP response rather than relying only on source files.
skills/canonical-header/SKILL.md
Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 74,705
- 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
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Browse files
SKILL.mdcore · 1,726 bytesSKILL.mdcore · 1,726 bytesreferences/rule.mddoc · 2,548 bytes
Read excerpt
# Sync HTML canonical tags and Link headers
Conflicting canonical-url signals can lead search engines to ignore both declarations, potentially causing duplicate content issues and incorrect indexing.
## Quick Reference
- Ensure the `rel="canonical"` tag in your HTML matches the `Link` canonical-url header if both are used
- Avoid sending conflicting signals to search engines about the primary version of a page
- Maintain consistency across all methods of declaring your canonical URL
## Check
Compare the HTML canonical tag with the HTTP Link header to ensure they point to the exact same URL.
