Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kitnpx agentmods add skills/giuseppe-trisciuoglio/developer-kit/nextjs-app-routerWrote 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.
[](https://agentmods.dev/skills/giuseppe-trisciuoglio/developer-kit/nextjs-app-router)<a href="https://agentmods.dev/skills/giuseppe-trisciuoglio/developer-kit/nextjs-app-router"><img src="https://agentmods.dev/badge/skills/giuseppe-trisciuoglio/developer-kit/nextjs-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.
<a href="https://agentmods.dev/skills/giuseppe-trisciuoglio/developer-kit/nextjs-app-router"><img src="https://agentmods.dev/badge/skills/giuseppe-trisciuoglio/developer-kit/nextjs-app-router.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket warn
- Snyk pass
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 | $0.00112 | $0.02988 |
| Opus 5.5 | $0.00045 | $0.01195 |
| Sonnet 5.5 | $0.00022 | $0.00598 |
| Haiku 4.5 | $0.00011 | $0.00299 |
Grade A, and why
nextjs-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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 379 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js App Router (Next.js 16+)
Build modern React applications using Next.js 16+ with App Router architecture.
Overview
This skill provides patterns for Server Components (default) and Client Components ("use client"), Server Actions for mutations and form handling, Route Handlers for API endpoints, explicit caching with "use cache" directive, parallel and intercepting routes, and Next.js 16 async APIs and proxy.ts.
When to Use
Activate when user requests involve:
- "Create a Next.js 16 project", "Set up App Router"
- "Server Component", "Client Component", "use client"
- "Server Action", "form submission", "mutation"
- "Route Handler", "API endpoint", "route.ts"
- "use cache", "cacheLife", "cacheTag", "revalidation"
- "parallel routes", "
@slot", "intercepting routes" - "proxy.ts", "migrate from middleware.ts"
- "layout.tsx", "page.tsx", "loading.tsx", "error.tsx", "not-found.tsx"
- "generateMetadata", "next/image", "next/font"
Quick Reference
| File | Purpose | Directive | Purpose |
|---|---|---|---|
page.tsx |
Route page | "use server" |
Server Action function |
layout.tsx |
Shared layout | "use client" |
Client Component boundary |
loading.tsx |
Suspense loading | "use cache" |
Explicit caching (Next.js 16) |
error.tsx |
Error boundary | ||
not-found.tsx |
404 page | ||
route.ts |
API Route Handler | ||
proxy.ts |
Routing boundary |
Instructions
Create New Project
npx create-next-app@latest my-app --typescript --tailwind --app --turbopack
Server Component
Server Components are the default in App Router. They run on the server and can use async/await.
// app/users/page.tsx
async function getUsers() {
const apiUrl = process.env.API_URL;
const res = await fetch(`${apiUrl}/users`);
return res.json();
}
export default async function UsersPage() {
const users = await getUsers();
return <main>{users.map(user => <UserCard key={user.id} user={user} />)}</main>;
}
What ships with it
10 files 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/app-router-fundamentals.md 8.3 KB
- references/best-practices.md 19 KB
- references/caching-strategies.md 3.2 KB
- references/data-fetching.md 5.5 KB
- references/examples.md 27 KB
- references/metadata-api.md 7.2 KB
- references/nextjs16-migration.md 5.8 KB
- references/patterns.md 18 KB
- references/routing-patterns.md 2.8 KB
- references/server-actions.md 5.1 KB
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.
- 1mo ago First seen · 379 lines · 112 tokens per session scan A 678a88fb1f32
nextjs-app-router is a skill published in the GitHub repository giuseppe-trisciuoglio/developer-kit (363 stars, last pushed 1mo ago), licensed MIT. It adds 112 tokens to every session and 2,988 once invoked, about $0.0004 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 2026-09-10.
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