Perf Audit
Audit frontend bundle size and performance. Use when user asks to "audit performance", "/perf-audit", "analyze bundle", "check bundle size", or wants to find performance bottlenecks. Don't use for backend performance, database query optimization, or projects without a frontend build step.
Install
$ agentstack add skill-helderberto-agent-skills-perf-audit ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-helderberto-agent-skills-perf-audit) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Performance Audit
Workflow
- Detect build tool from
package.json(vite, webpack, next, rollup) - Run the production build via the project's task runner (auto-detect from package.json).
- Analyze bundle output:
Vite: ``bash npx vite-bundle-visualizer ``
webpack/Next.js: ``bash npx webpack-bundle-analyzer ``
- Check
package.jsonfor known heavy packages - Report findings with size impact
Compare against standard industry thresholds; report gzipped sizes.
Output format
- Bundle summary: total size / gzipped size vs budget
- Large chunks: name + size + % of total
- Heavy deps: package + size + lighter alternative
- Quick wins: sorted by estimated savings
Rules
- Report gzipped sizes (what the browser downloads)
- Never auto-change dependencies -- report and suggest only
Error Handling
- Build fails -- report the error and stop; fix build issues before auditing
- No build output found -- run production build first
- Build tool unrecognized -- fall back to scanning
package.jsonfor heavy packages only
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: helderberto
- Source: helderberto/agent-skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.