# Next JS App Router > Use when working with a component or module was extracted from a page to a separate file, but the extracted file is still 300+ LOC. This just moved the god file — it did not solve the modularity problem. After extraction, split further into focused sub-components. - Skill: `tomevault-io/next-js-app-router-2` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/next-js-app-router-2` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/next-js-app-router-2/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Web & Frontend - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/next-js-app-router-2 --- --- > Source: [Levironexe/architect](https://github.com/Levironexe/architect) — distributed by [TomeVault](https://tomevault.io).