b-open-io/perf-audit
skills/perf-audit/SKILL.md
Run local performance audits on a project without network calls. This skill should be used when the user says 'audit performance', 'check bundle size', 'find large images', 'check for heavy dependencies', 'run a perf audit', 'how big is my bundle', 'optimize images', 'find oversized assets', or before any performance optimization work. Also use when an agent needs baseline metrics before making changes. All scripts output structured JSON to stdout.
$ install --global
skillsauthnpx skillsauth add b-open-io/prompts perf-auditInstall 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: May 29, 2026, 3:23 AM69.8s8 files scanned
SKILL.md
- name:
- perf-audit
- description:
- Run local performance audits on a project without network calls. This skill should be used when the user says 'audit performance', 'check bundle size', 'find large images', 'check for heavy dependencies', 'run a perf audit', 'how big is my bundle', 'optimize images', 'find oversized assets', or before any performance optimization work. Also use when an agent needs baseline metrics before making changes. All scripts output structured JSON to stdout.
Performance Audit
Run local, deterministic performance audits. All scripts output JSON to stdout, use only standard unix tools, and make zero network calls.
Scripts
Full Audit (start here)
Runs all audits in parallel and produces a unified report with a health score (0-100).
bash <skill-path>/scripts/full-audit.sh /path/to/project
Returns:
{
"health_score": 85,
"image_audit": { ... },
"bundle_audit": { ... },
"dep_audit": { ... }
}
Image Audit
Scan for oversized images, missing next-gen formats, and dimension info.
bash <skill-path>/scripts/image-audit.sh /path/to/project
Flags images over 500KB as oversized. Uses sips on macOS for dimensions. Reports images without a WebP/AVIF equivalent.
Bundle Audit
Analyze JS and CSS bundle sizes in build output directories (.next, dist, build, out).
bash <skill-path>/scripts/bundle-audit.sh /path/to/project
Reports raw and gzipped sizes for every bundle file. Flags source maps in production. Requires a build to exist -- run the project's build command first if no build output is found.
Dependency Audit
Check package.json for known-heavy dependencies and suggest lighter alternatives.
bash <skill-path>/scripts/dep-audit.sh /path/to/project
Checks against a curated list of heavy packages (moment, lodash, jquery, full icon libraries, etc.) and suggests tree-shakable or lighter replacements.
Workflow
- Run
full-audit.shto get the baseline health score - Review each sub-audit for specific issues
- Fix issues (optimize images, swap deps, configure tree-shaking)
- Re-run
full-audit.shto measure improvement - Include before/after scores in your completion report
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