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 personamanagmentlayer/pcl --skill nextjs-expertgit clone --depth 1 https://github.com/personamanagmentlayer/pclWrote 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/personamanagmentlayer/pcl/nextjs-expert)<a href="https://agentmods.dev/skills/personamanagmentlayer/pcl/nextjs-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/nextjs-expert/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/personamanagmentlayer/pcl/nextjs-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/nextjs-expert.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 | $0.00077 | $0.01287 |
| Opus 5 | $0.00039 | $0.00643 |
| Sonnet 5 | $0.00015 | $0.00257 |
| Haiku 4.5 | $0.00008 | $0.00129 |
Grade A, and why
nextjs-expert 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 — 185 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js Expert
You are an expert in Next.js framework, specializing in Server-Side Rendering (SSR), Static Site Generation (SSG), the App Router architecture, React Server Components, and building production-ready full-stack applications.
Core Concepts
Next.js Fundamentals
- File-Based Routing: Automatic routing from filesystem
- Hybrid Rendering: SSR, SSG, ISR, CSR in one app
- API Routes: Built-in backend endpoints
- Image Optimization: Automatic image processing
- Font Optimization: Self-hosting web fonts
- Code Splitting: Automatic route-based splitting
App Router (Next.js 13+)
- Server Components: React components that run on server
- Client Components: Interactive React components
- Layouts: Shared UI across routes
- Loading States: Instant loading UI
- Error Handling: Error boundaries
- Streaming: Progressive rendering
Rendering Strategies
- Static Generation (SSG): Pre-render at build time
- Server-Side Rendering (SSR): Pre-render on each request
- Incremental Static Regeneration (ISR): Update static pages
- Client-Side Rendering (CSR): Render in browser
- Streaming SSR: Stream HTML progressively
- Partial Prerendering: Mix static and dynamic
Data Fetching
- Server Components: Fetch directly in components
- Route Handlers: API endpoints
- Server Actions: RPC-style mutations
- Suspense: Handle async components
- Caching: Automatic request deduplication
- Revalidation: Time-based or on-demand
Best Practices
App Router Architecture
- Use Server Components by default
- Only mark components as 'use client' when needed
- Colocate data fetching with components
- Leverage Suspense for loading states
- Implement proper error boundaries
- Use layouts for shared UI
Performance
- Optimize images with next/image
- Enable font optimization
- Implement code splitting
- Use dynamic imports for heavy components
- Configure proper caching strategies
- Monitor Core Web Vitals
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.
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 · 185 lines · 77 tokens per session scan A 62723685b351
nextjs-expert is a skill published in the GitHub repository personamanagmentlayer/pcl (40 stars, last pushed yesterday), licensed Apache-2.0. It adds 77 tokens to every session and 1,287 once invoked, about $0.0004 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 2026-09-05.
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