# Codex Nextjs App Router Review

> Review changed Next.js App Router files for server/client boundary, caching, routing, and secret-exposure regressions. Use when app routes, middleware, or Next.js TSX changed.

- Skill: `bk202503/codex-nextjs-app-router-review` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add bk202503/codex-nextjs-app-router-review`
- Raw SKILL.md: https://api.skillmd.com/api/skills/bk202503/codex-nextjs-app-router-review/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: BK202503 (https://skillmd.com/u/bk202503)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/bk202503/codex-nextjs-app-router-review

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# Next.js App Router review

Review changed App Router files only. Resolve the Next.js version from `package.json` when version semantics matter.

Check client components importing server-only code or secrets, hooks in server components, unintended fetch caching or dynamic rendering, async `params` and `searchParams` in Next 15+, route handlers returning invalid responses or missing caching policy, Edge-incompatible middleware APIs, and environment variables exposed to client code.

Report severity, file and line, runtime or data-exposure impact, and a concrete fix. Do not modify code.