Borrowing it
Nothing to install: this file belongs to beel-collab/presets.dev. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/beel-collab/presets.dev/main/release/nextjs/native/copilot/.github/instructions/nextjs.instructions.mdgit clone --depth 1 https://github.com/beel-collab/presets.devWrote 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/instructions/beel-collab/presets.dev/nextjs)<a href="https://agentmods.dev/instructions/beel-collab/presets.dev/nextjs"><img src="https://agentmods.dev/badge/instructions/beel-collab/presets.dev/nextjs/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/instructions/beel-collab/presets.dev/nextjs"><img src="https://agentmods.dev/badge/instructions/beel-collab/presets.dev/nextjs.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.02055 | $0.02055 |
| Opus 5.5 | $0.00822 | $0.00822 |
| Sonnet 5.5 | $0.00411 | $0.00411 |
| Haiku 4.5 | $0.00205 | $0.00205 |
Grade A, and why
presets.dev nextjs.instructions.md 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 today.
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 — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js Copilot Instructions: App Router, TypeScript and Server Actions
Path-specific Copilot instructions for Next.js. They apply through applyTo and leave .github/copilot-instructions.md in place.
Updated for Next.js 16.4.6, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Read package.json, the lockfile, and next.config before editing. Match the directories and helpers the app already uses.
Project shape
Prefer the App Router in app/ or src/app/. A file is a Server Component until it starts with "use client". Put page, layout, loading, error, and not-found where the router already expects them. Colocate a route's data helper next to that route.
Leave pages/ alone unless the task is a migration. Do not mix App Router conventions into a Pages Router file, and do not start a second routing tree.
Route Handlers live in route.ts. They are HTTP endpoints. Give them a method, a status, and a bounded body. On Next 16, request interception is proxy.ts (or src/proxy.ts) exporting proxy. It runs on the Node.js runtime and cannot be switched to Edge. middleware.ts is the deprecated name, still available only when the project must stay on the Edge runtime. Do not create a new middleware.ts on a 16 app. The proxy is a gate for redirects and coarse checks. It is not the place for database work.
TypeScript
Keep the project's strict compiler settings. Type props with the helpers the project already generates, and rerun next typegen or next dev when those helpers are stale. Validate data that crosses a network or a form boundary with the parser the repo already uses. Do not add a second validation library.
any and a bare as hide a real mismatch. Narrow the value, or parse it. A client module cannot import next/headers, a database client, or a module marked server-only.
Server and client components
Fetch and hold secrets in Server Components. Add "use client" for state, an effect, a browser API, or an event handler. If one button needs that, put the button in a small client child and pass serializable props in. A layout does not need "use client" because a single control has onClick.
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.
- today First seen · 112 lines · 2,055 tokens per session scan A fe51052f883c
presets.dev nextjs.instructions.md is an instructions file published in the GitHub repository beel-collab/presets.dev (3 stars, last pushed yesterday), licensed MIT. It adds 2,055 tokens to every session, about $0.0082 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 2026-11-13.
presets.dev nextjs.instructions.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| presets.dev nextjs.instructions.mdbeel-collab/presets.dev | Instructions file | 3 | yesterday | MIT | A | 2,055 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,685 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,086 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 280k | 2d ago | MIT | A | 4,325 | Codex, OpenCode |