What is nextjs-overview-and-app-router?

Guidance for starting and organizing a Next.js application with App Router, Next.js's newer system for pages, layouts, and navigation.

Use it when creating an app, choosing App Router, understanding files such as app, layout.tsx, and page.tsx, or separating server and client work.

It helps choose the right starting approach and identify which Next.js feature or follow-up guide should handle a task.

nextjs-overview-and-app-router — Skill by andrewsrigom/agent-skills

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add andrewsrigom/agent-skills --skill nextjs-overview-and-app-router

Clone the repo

git clone --depth 1 https://github.com/andrewsrigom/agent-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/nextjs-overview-and-app-router/github.svg)](https://agentmods.dev/skills/andrewsrigom/agent-skills/nextjs-overview-and-app-router)

Your own site

<a href="https://agentmods.dev/skills/andrewsrigom/agent-skills/nextjs-overview-and-app-router"><img src="https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/nextjs-overview-and-app-router/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/andrewsrigom/agent-skills/nextjs-overview-and-app-router"><img src="https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/nextjs-overview-and-app-router.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 84 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,027 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00084	$0.01027
Opus 5.5	$0.00034	$0.00411
Sonnet 5.5	$0.00017	$0.00205
Haiku 4.5	$0.00008	$0.00103

Measured 2mo ago against content hash adb742d5a92e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nextjs-overview-and-app-router scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

nextjs/nextjs-overview-and-app-router/SKILL.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Next.js Overview and App Router

Use this skill when the task is primarily about choosing the right Next.js starting path, understanding App Router structure, or deciding which Next.js surface owns the work.

Scope

App Router docs topology and pack routing
installation and starter decisions
core file conventions like app/, layout.tsx, page.tsx, and route groups
high-level Server Components vs Client Components framing
version and upgrade awareness

Routing cues

install Next.js, create a new app, choose App Router, understand file conventions, or decide where a Next.js task belongs -> use this skill
fetch, caching, revalidation, use cache, unstable_cache, revalidateTag, or revalidatePath -> use nextjs-data-fetching-and-cache
use server, Server Actions, Route Handlers, form actions, cookies, redirects after mutations, or backend mutation flow -> use nextjs-server-actions-and-route-handlers
metadata, OG images, generateMetadata, JSON-LD, robots.txt, or sitemap.xml -> use nextjs-metadata-seo-and-file-conventions
rendering mode selection, streaming, runtime boundaries, runtime = 'edge', or legacy middleware / new proxy.ts work -> use nextjs-rendering-runtime-and-middleware

Default path

Read references/docs-map-and-starting-points.md first.
Treat App Router as the default for new Next.js work.
Keep the initial setup minimal: app/, root layout.tsx, route page.tsx, and only the files needed for the current slice.
Default to Server Components and add 'use client' only where browser-only interactivity is actually needed.
Route out quickly once the task becomes mostly about caching, mutations, SEO, or rendering runtime.

When to deviate

Switch to Pages Router guidance only if the repo is already Pages-based or the task explicitly targets Pages APIs.
Add 'use client' only when state, effects, refs, browser APIs, or client-only hooks are required.
Reach for proxy.ts or runtime-specific logic only when the task is clearly about request interception or execution boundaries.

Read the full file on GitHub · 87 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/docs-map-and-starting-points.md 1.5 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 87 lines · 84 tokens per session scan A adb742d5a92e

Subscribe to this mod's changes

nextjs-overview-and-app-router is a skill published in the GitHub repository andrewsrigom/agent-skills (2 stars, last pushed 7mo ago), licensed MIT. It adds 84 tokens to every session and 1,027 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Frontend React

nextjs-overview-and-app-router next to 6 skills from other repositories
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