claude-skills is a collection of specialized skills that extends Claude Code for full-stack development. Developers use it for programming languages, frameworks, infrastructure, APIs, testing, DevOps, security, data and machine learning, platform tasks, and project workflows.
Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/Jeffallan/claude-skillsnpx agentmods add skills/jeffallan/claude-skills/nextjs-developerWrote 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/jeffallan/claude-skills/nextjs-developer)<a href="https://agentmods.dev/skills/jeffallan/claude-skills/nextjs-developer"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/nextjs-developer.svg" alt="Measured on agentmods" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 65 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00115 | $0.01295 |
| Opus 5 | $0.00057 | $0.00647 |
| Sonnet 5 | $0.00023 | $0.00259 |
| Haiku 4.5 | $0.00012 | $0.00129 |
Grade A, and why
nextjs-developer 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 8d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- nextjs-developer — 100% identical, 0 lines differ
- nextjs-developer — 95% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 146 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js Developer
Senior Next.js developer with expertise in Next.js 14+ App Router, server components, and full-stack deployment with focus on performance and SEO excellence.
Core Workflow
- Architecture planning — Define app structure, routes, layouts, rendering strategy
- Implement routing — Create App Router structure with layouts, templates, loading/error states
- Data layer — Set up server components, data fetching, caching, revalidation
- Optimize — Images, fonts, bundles, streaming, edge runtime
- Deploy — Production build, environment setup, monitoring
- Validate: run
next buildlocally, confirm zero type errors, checkNEXT_PUBLIC_*and server-only env vars are set, run Lighthouse/PageSpeed to confirm Core Web Vitals > 90
- Validate: run
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| App Router | references/app-router.md |
File-based routing, layouts, templates, route groups |
| Server Components | references/server-components.md |
RSC patterns, streaming, client boundaries |
| Server Actions | references/server-actions.md |
Form handling, mutations, revalidation |
| Data Fetching | references/data-fetching.md |
fetch, caching, ISR, on-demand revalidation |
| Deployment | references/deployment.md |
Vercel, self-hosting, Docker, optimization |
Constraints
MUST DO (Next.js-specific)
- Use App Router (
app/directory), never Pages Router (pages/) - Keep components as Server Components by default; add
'use client'only at the leaf boundary where interactivity is required - Use native
fetchwith explicitcache/next.revalidateoptions — do not rely on implicit caching - Use
generateMetadata(or the staticmetadataexport) for all SEO — never hardcode<title>or<meta>tags in JSX - Optimize every image with
next/image; never use a plain<img>tag for content images - Add
loading.tsxanderror.tsxat every route segment that performs async data fetching
What ships with it
5 files 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.
- 8d ago First seen · 146 lines · 115 tokens per session scan A a8631cf77897
nextjs-developer is a skill published in the GitHub repository Jeffallan/claude-skills (11,347 stars, last pushed 1mo ago), licensed MIT. It adds 115 tokens to every session and 1,295 once invoked, about $0.0006 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.
Other skills, from other repositories
tailwind-spacing-audit
Use when Tailwind UI spacing, alignment, gaps, margins, padding, or toolbar and navbar rhythm looks inconsistent.
add-react-i18n
Add react-i18next internationalization to a React NPM library package. Creates isolated i18n instance, translation files, modifies provider and components. Use when the user wants to add multi-language support to a React component library.
react-arch
Create the complete frontend architecture for a new entity in the React application. Generates TypeScript types, service class, context provider, custom hook, and registers the provider in main.tsx. Use this skill when the user asks to create a new entity, feature module, or domain area in the frontend.
react-modal
Create modal dialogs in the frontend using a custom Modal component built on top of Radix UI Dialog. Use this skill whenever the user asks to create, add, or modify a modal, dialog, popup, or confirmation prompt in the React application.
react-alert
Display user-facing alerts, notifications, and feedback messages using toast notifications from the sonner library. Use this skill whenever the user asks to show an alert, notification, success message, error message, warning, or any kind of user feedback popup.
react-architecture
Create the complete frontend architecture for a new entity in the React application. Generates TypeScript types, service class, context provider, custom hook, and registers the provider in main.tsx. Use this skill when the user asks to create a new entity, feature module, or domain area in the frontend.