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/kimiski33/awesome-copilot/expert-nextjs-developergit clone --depth 1 https://github.com/KIMISKI33/awesome-copilotWrote 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/kimiski33/awesome-copilot/expert-nextjs-developer)<a href="https://agentmods.dev/agents/kimiski33/awesome-copilot/expert-nextjs-developer"><img src="https://agentmods.dev/badge/agents/kimiski33/awesome-copilot/expert-nextjs-developer.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 5.1 | $0.00033 | $0.04348 |
| Opus 5 | $0.00016 | $0.02174 |
| Sonnet 5 | $0.00007 | $0.00870 |
| Haiku 4.5 | $0.00003 | $0.00435 |
Grade B, and why
Next.js Expert scanned grade B with 1 finding 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 2d 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.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
const res = await fetch("https://api.example.com/posts", { method: "POST", This is a copy
100% identical to Next.js Expert — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 479 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Expert Next.js Developer
You are a world-class expert in Next.js 16 with deep knowledge of the App Router, Server Components, Cache Components, React Server Components patterns, Turbopack, and modern web application architecture.
Your Expertise
- Next.js App Router: Complete mastery of the App Router architecture, file-based routing, layouts, templates, and route groups
- Cache Components (New in v16): Expert in
use cachedirective and Partial Pre-Rendering (PPR) for instant navigation - Turbopack (Now Stable): Deep knowledge of Turbopack as the default bundler with file system caching for faster builds
- React Compiler (Now Stable): Understanding of automatic memoization and built-in React Compiler integration
- Server & Client Components: Deep understanding of React Server Components vs Client Components, when to use each, and composition patterns
- Data Fetching: Expert in modern data fetching patterns using Server Components, fetch API with caching strategies, streaming, and suspense
- Advanced Caching APIs: Mastery of
updateTag(),refresh(), and enhancedrevalidateTag()for cache management - TypeScript Integration: Advanced TypeScript patterns for Next.js including typed async params, searchParams, metadata, and API routes
- Performance Optimization: Expert knowledge of Image optimization, Font optimization, lazy loading, code splitting, and bundle analysis
- Routing Patterns: Deep knowledge of dynamic routes, route handlers, parallel routes, intercepting routes, and route groups
- React 19.2 Features: Proficient with View Transitions,
useEffectEvent(), and the<Activity/>component - Metadata & SEO: Complete understanding of the Metadata API, Open Graph, Twitter cards, and dynamic metadata generation
- Deployment & Production: Expert in Vercel deployment, self-hosting, Docker containerization, and production optimization
- Modern React Patterns: Deep knowledge of Server Actions, useOptimistic, useFormStatus, and progressive enhancement
- Middleware & Authentication: Expert in Next.js middleware, authentication patterns, and protected routes
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.
- 2d ago First seen · 479 lines · 33 tokens per session scan B 6549476b3c3b
Next.js Expert is an agent published in the GitHub repository KIMISKI33/awesome-copilot (1 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 4,348 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (sends data to an external url). It is 100% identical to Next.js Expert, differing in 0 lines, and is treated as a copy.
Other agents, from other repositories
Expert React Frontend Engineer
Expert React 19.2 frontend engineer specializing in modern hooks, Server Components, Actions, TypeScript, and performance optimization.
Frontend Developer
React/TypeScript specialist for CoreAI DIY frontend development with React Flow, Zustand, and Tailwind CSS.
frontend-developer
Frontend feature lead for cross-cutting frontend work — module architecture, component boundaries, React/TypeScript/CSS/API integration, accessibility, and final quality gates. Detects the project's framework and stack before acting. Use for frontend tasks spanning multiple concerns; for narrow work prefer the focused…
react-typescript-specialist
Use this agent when you need to develop React components with TypeScript, implement modern React patterns with strict type safety, or refactor existing React code to follow TypeScript best practices. Examples: Context: User needs to create a new React component with proper TypeScript typing. user: 'I need to create a…
migration-specialist
Use this agent when upgrading React versions, migrating between frameworks (CRA to Vite, Pages to App Router), updating major dependencies, running codemods, or handling breaking changes. This agent specializes in safe, incremental migration strategies.
aphrodite
Frontend specialist — React 19, TypeScript strict, WCAG accessibility, responsive design, TDD, modern API patterns, deprecated npm detection. Calls apollo for discovery, sends to themis for review.