13-phase production QA for fullstack Next.js apps: build verification, SEO tags, OG images, favicon, route regression, API auth, page speed, lazy load, vulnerability scan, UI/UX cards, error boundaries, database, secure rendering, and cleanup.
SkillScore87Maintained
Automatic
◆QA & Test Engineering pack
Last verified 8/12/2026
What it changes
Passed 20 of 23 test cases with the skill, and 13 of 23 without it.
Without skill57%
With skill87%
Checks it passed that the model alone missed
Uses curl -sI to fetch HTTP response headers.
Includes npx tsc --noEmit for TypeScript type checking.
Uses curl size_download to measure page download weight.
and 7 more in the full report
7 fixed13 passed either way3 still failing0 broke
Pass-rate lift
+30 pp
Tokens
+195%
Agent turns
0%
Response time
-24%
Model gemini-3.6-flashMeasured 8/12/2026v120 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 7
Prompt
Our team just completed major updates to our web app's authentication, database layer, and UI components. Can you run a thorough pre-deployment quality inspection covering static analysis, route responses, cookie safety, git hygiene, and UI/UX edge cases? Return an itemized pre-flight diagnostic report summarizing test findings and flagging any critical release blockers.
What was checked, without and with the skill
Checked
Without skill
With skill
Inspects set-cookie headers for the HttpOnly attribute.
Passed
Passed
Checks for the root error boundary file app/global-error.tsx.
Missed
Passed
case-02 · gemini-3.6-flash · 8/12/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md454 linessingle file
Production QA Validator
Run phases in order. Fix failures before moving to next.
When to Use
Use before shipping or promoting a fullstack Next.js app to production.
Use after large UI, SEO, auth, API, database, or dependency changes need a concrete launch-readiness pass.
Use when you need a compact command-driven checklist for build, route, metadata, performance, security, and cleanup checks.
export PROD_URL="https://yourdomain.com"
export QA_AUTH_HEADER="" # optional: "Bearer eyJ..."
export PAGESPEED_API_KEY="" # optional: for auto PageSpeed API
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