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 skills add AratKruglik/claude-sdlc --skill nextjs-conventionsgit clone --depth 1 https://github.com/AratKruglik/claude-sdlcWrote 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/aratkruglik/claude-sdlc/nextjs-conventions)<a href="https://agentmods.dev/skills/aratkruglik/claude-sdlc/nextjs-conventions"><img src="https://agentmods.dev/badge/skills/aratkruglik/claude-sdlc/nextjs-conventions/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/aratkruglik/claude-sdlc/nextjs-conventions"><img src="https://agentmods.dev/badge/skills/aratkruglik/claude-sdlc/nextjs-conventions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector 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 | $0.00162 | $0.02771 |
| Opus 5 | $0.00081 | $0.01385 |
| Sonnet 5 | $0.00032 | $0.00554 |
| Haiku 4.5 | $0.00016 | $0.00277 |
Grade A, and why
nextjs-conventions 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 12d 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 — 375 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js Conventions
This skill consolidates structural and configuration idioms for Next.js App Router projects. Apply alongside server-component-patterns (the RSC/Client model) and js-foundation:typescript-patterns (TS strictness).
Project layout
project-root/
├── package.json
├── tsconfig.json
├── next.config.{js,mjs,ts}
├── middleware.ts # optional, runs on every matched request
├── app/ # App Router root (modern)
│ ├── layout.tsx # ROOT layout (required) — defines <html><body>
│ ├── page.tsx # / route
│ ├── loading.tsx # default loading UI
│ ├── error.tsx # default error boundary (Client Component)
│ ├── not-found.tsx # 404 UI
│ ├── globals.css # imported once in root layout
│ ├── (marketing)/ # route group (parens hide from URL)
│ │ ├── about/page.tsx # /about
│ │ └── pricing/page.tsx # /pricing
│ ├── (app)/ # another group, possibly with own layout
│ │ ├── layout.tsx
│ │ ├── dashboard/page.tsx
│ │ └── settings/
│ │ ├── layout.tsx
│ │ ├── page.tsx # /settings
│ │ └── account/page.tsx # /settings/account
│ ├── api/ # API routes (Route Handlers)
│ │ └── users/route.ts # GET /api/users
│ └── _components/ # private folder (excluded from routing)
├── components/ # shared UI components
│ ├── ui/ # primitives (Button, Input, etc.)
│ └── features/ # feature-specific
├── lib/ # framework-agnostic utilities
│ ├── db.ts # ORM client
│ ├── auth.ts # auth setup
│ └── utils.ts
├── public/ # static assets — served at /
├── styles/ # if not using app/globals.css
└── tests/ # or co-located *.test.tsx
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.
- 12d ago First seen · 375 lines · 162 tokens per session scan A 770203dae327
nextjs-conventions is a skill published in the GitHub repository AratKruglik/claude-sdlc (33 stars, last pushed 7d ago), licensed MIT. It adds 162 tokens to every session and 2,771 once invoked, about $0.0008 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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