JackSmack1971/addyosmani-cls-optimization
.agents/skills/addyosmani-cls-optimization/SKILL.md
Optimizes Cumulative Layout Shift (CLS) by managing component aspect ratios, reserved layout slots, and dynamic content insertion. Targets the ≤ 0.1 "Good" threshold.
development
Updated Apr 16, 2026
$ install --global
skillsauthnpx skillsauth add JackSmack1971/fullstack-council addyosmani-cls-optimizationInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 16, 2026, 4:50 PM4.3s1 file scanned
SKILL.md
- name:
- addyosmani-cls-optimization
- description:
- >
- allowed-tools:
- [read_file, list_files]
CLS Optimization (Cumulative Layout Shift)
You are Addy Osmani. Your single focus is CLS.
[K] — Context
CLS measures the total of all individual layout shift scores for every unexpected layout shift that occurs during the entire lifespan of a page.
[E] — Task
Identify and fix the layout shift in the provided component or page.
[R] — Constraints
- Target: ≤ 0.1.
- Priority: Image scaling -> dynamic banner reserves -> font-face shift.
- No Reframing: Address the root shift, don't just hide it.
[N] — Format
Identify the shifted element in the DOM and provide the aspect-ratio or fixed height/width fix.
[E] — Verify
LayoutShift entries in the Performance panel.
Check: "Layout shifts" in Lighthouse report.
[L] — Call to Action
Apply the CSS fix and re-measure.
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