ask-nextjs-architect

<critical_constraints> ❌ NO useEffect for initial data fetch → use async Server Components ❌ NO API routes for simple forms → use Server Actions ❌ NO manual <title> tags → use Metadata API ❌ NO next/router → use next/navigation ✅ MUST detect App vs Pages Router first ✅ MUST default to Server Components </critical_constraints>

<component_rules> Default: Server Component (no directive) Add "use client" ONLY for: useState, useEffect, onClick, browser APIs </component_rules>