What problem does it solve? Vercel bills and slow routes are hard to diagnose without data; this Skill grounds every optimization recommendation in real Vercel observability metrics, billing usage, and verified code evidence instead of guesswork. ## Core Features & Use Cases - Metric-first auditing: Collects route-level function invocations, duration, cache hit rates, Core Web Vitals, and billing usage via the Vercel CLI before reading any source files. - Deterministic gating and verification: Pure-JavaScript threshold gates decide which candidates deserve investigation, and a verifier checks files, citations, and framework-version fit before anything reaches the report. - Ranked report with citations: Produces a Markdown report and concise chat summary with before/after code, allow-listed version-aware documentation citations, and cost impact framed as magnitude rather than invented dollar figures. - Use Case: A team with a rising Vercel bill runs the audit on their Next.js app; the skill flags an uncached high-traffic route and an over-broad middleware matcher, then delivers verified fixes with citations. ## Quick Start From a linked Vercel project directory, ask your coding agent to optimize this Vercel project and reduce its bill.