Expert guidance for the Next.js App Router, the system Next.js uses to organize pages and shared layouts. It covers routing, server-rendered components, server actions, caching, data fetching, and deployment.

Use it when building, debugging, or planning a Next.js application with pages, layouts, server code, middleware, or deployment.

It helps you choose the right Next.js architecture and diagnose problems in applications that use the App Router.

nextjs — Skill by leonvanzyl

Install

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.

agentmods

npx agentmods add skills/leonvanzyl/agentic-coding-starter-kit/nextjs

Any agent

npx skills add leonvanzyl/agentic-coding-starter-kit --skill nextjs

Clone the repo

git clone --depth 1 https://github.com/leonvanzyl/agentic-coding-starter-kit

Made for: Claude Code, Codex.

Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,647 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin unknown No closer match found in the catalogue.

Token cost

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	$0.00053	$0.04647
Opus 5	$0.00026	$0.02323
Sonnet 5	$0.00011	$0.00929
Haiku 4.5	$0.00005	$0.00465

Measured 2d ago against content hash a84d03ab8e78, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

nextjs 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 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.

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.

.agents/skills/nextjs/SKILL.md · 435 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

42 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.

Changes

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 · 435 lines · 53 tokens per session scan A a84d03ab8e78

Subscribe to this mod's changes

nextjs is a skill published in the GitHub repository leonvanzyl/agentic-coding-starter-kit (436 stars, last pushed 3mo ago), with no licence file. It adds 53 tokens to every session and 4,647 once invoked, about $0.0003 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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