Next.js 15+ App Router, Server Actions & Streaming RSC Skill

Architect fast, type-safe Next.js App Router applications: React Server Components (RSC), Suspense streaming boundaries, validated Server Actions, and fine

---
name: nextjs-app-router
description: Architect fast, type-safe Next.js App Router applications: React Server Components (RSC), Suspense streaming boundaries, validated Server Actions, and fine-grained cache invalidation. Use when working with Next.js App Router, React Server Components, Server Actions, Vercel.
triggers:
  - nextjs app router
  - next.js app router
  - react server components
---

# Next.js 15+ App Router, Server Actions & Streaming RSC Skill

## 1. When to Use This Skill
Load `skill-nextjs-app-router` whenever an engineering or operations task involves **Next.js App Router, React Server Components, Server Actions, Vercel**. Specifically:
- Architect fast, type-safe Next.js App Router applications: React Server Components (RSC), Suspense streaming boundaries, validated Server Actions, and fine-grained cache invalidation.
- Designing, reviewing, or debugging production configurations without guesswork or deprecated flags.
- Running deterministic pre-flight and post-execution verification checks before reporting completion.

## 2. Prerequisites & Required Environment
- **Target Stack:** Next.js App Router, React Server Components, Server Actions, Vercel
- **Permissions:** Read-only inspection by default; ask for explicit confirmation before executing destructive mutations or production deployments.
- **Reference Repository:** `https://nextjs.org/docs`

## 3. Step-by-Step Execution Playbook
1. **Context & Configuration Discovery:**
   Inspect existing project manifests (`package.json`, `wrangler.jsonc`, schema files, or environment declarations) before proposing changes. Never overwrite existing bindings or credentials blindly.
2. **Deterministic Implementation:**
   Apply the canonical patterns for **Next.js App Router**:
   - Enforce strict schema/type validation at every external boundary.
   - Include explicit error handling, structured logging, and idempotency keys on all mutating calls.
   - Keep secrets in environment variables or secret stores—never hardcode tokens in source files.
3. **Verification & Regression Gate:**
   Run the verification commands below and inspect both exit codes and output payloads before marking the task complete.

## 4. Reference Commands & CLI Workflow
```bash
npx next build
npx next typegen
```

## 5. Edge Cases & Anti-Hallucination Guardrails
- **Zero Unverified Claims:** Never claim a deployment, migration, or API call succeeded without inspecting the command output or HTTP status code.
- **Rollback Readiness:** Always record the previous state or migration version so changes can be reverted cleanly if downstream health checks fail.

Synthesized Engineering Blueprint & Setup Guide