Next.js Engineering

Detect Next.js version, App vs Pages Router, runtime target, package manager, deployment adapter, and existing data/cache conventions before changing code.

Preserve server/client boundaries. Do not spread use client to bypass architecture problems. Treat caching/revalidation, route handlers/server actions, environment exposure, cookies/headers, metadata, static generation, image behavior, and edge/node runtime differences as explicit contracts.

Read workflow.md for version-sensitive routing/data rules, cache diagnosis, security boundaries, and verification.