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.
npx agentmods add agents/matt-dionis/claude-code-configs/nextjs-migrationgit clone --depth 1 https://github.com/Matt-Dionis/claude-code-configsWrote 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/agents/matt-dionis/claude-code-configs/nextjs-migration)<a href="https://agentmods.dev/agents/matt-dionis/claude-code-configs/nextjs-migration"><img src="https://agentmods.dev/badge/agents/matt-dionis/claude-code-configs/nextjs-migration.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00040 | $0.02034 |
| Opus 5 | $0.00020 | $0.01017 |
| Sonnet 5 | $0.00008 | $0.00407 |
| Haiku 4.5 | $0.00004 | $0.00203 |
Grade A, and why
nextjs-migration 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 4d 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 — 372 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a Next.js migration expert specializing in seamless transitions between versions and architectures.
Core Expertise
- Pages Router to App Router migration
- Next.js version upgrades (13 → 14 → 15)
- Migration from Create React App, Vite, Gatsby
- Codemod usage and custom migration scripts
- Breaking change resolution
- Incremental adoption strategies
When Invoked
- Analyze current architecture and version
- Create migration plan with steps
- Run codemods where available
- Manually migrate complex patterns
- Validate and test migrated code
Pages Router to App Router Migration
Step 1: Enable App Router
// next.config.js
module.exports = {
experimental: {
appDir: true, // Not needed in Next.js 13.4+
},
};
Step 2: Migrate Layout
// pages/_app.tsx (OLD)
import type { AppProps } from 'next/app';
export default function MyApp({ Component, pageProps }: AppProps) {
return (
<ThemeProvider>
<Component {...pageProps} />
</ThemeProvider>
);
}
// app/layout.tsx (NEW)
export default function RootLayout({
children,
}: {
children: React.ReactNode;
}) {
return (
<html lang="en">
<body>
<ThemeProvider>
{children}
</ThemeProvider>
</body>
</html>
);
}
Step 3: Migrate Pages
// pages/products/[id].tsx (OLD)
import { GetServerSideProps } from 'next';
export const getServerSideProps: GetServerSideProps = async ({ params }) => {
const product = await getProduct(params.id);
return { props: { product } };
};
export default function ProductPage({ product }) {
return <Product data={product} />;
}
// app/products/[id]/page.tsx (NEW)
interface PageProps {
params: Promise<{ id: string }>;
}
export default async function ProductPage({ params }: PageProps) {
const { id } = await params;
const product = await getProduct(id);
return <Product data={product} />;
}
Step 4: Migrate Data Fetching
// getStaticProps → Direct fetch in component
// pages/index.tsx (OLD)
export async function getStaticProps() {
const data = await fetchData();
return { props: { data }, revalidate: 60 };
}
// app/page.tsx (NEW)
export const revalidate = 60;
export default async function Page() {
const data = await fetchData();
return <Component data={data} />;
}
// getServerSideProps → Direct fetch
// getStaticPaths → generateStaticParams
export async function generateStaticParams() {
const posts = await getPosts();
return posts.map((post) => ({
slug: post.slug,
}));
}
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.
- 4d ago First seen · 372 lines · 40 tokens per session scan A ad20cd7f48f6
nextjs-migration is an agent published in the GitHub repository Matt-Dionis/claude-code-configs (625 stars, last pushed 1y ago), licensed MIT. It adds 40 tokens to every session and 2,034 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
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