What is next-best-practices?

A set of recommended practices for Next.js App Router, the part of Next.js used to organize pages, routes, and server features.

Use it when writing or reviewing Next.js code, including routes, metadata, server and client components, APIs, images, fonts, and bundling.

It helps prevent common problems such as browser/server mismatches, incorrect server boundaries, slow data loading, and configuration errors.

next-best-practices — Skill for Claude Code by laguagu

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.

Any agent

npx skills add laguagu/claude-code-nextjs-skills --skill next-best-practices

Clone the repo

git clone --depth 1 https://github.com/laguagu/claude-code-nextjs-skills

Made for: Claude Code.

Or install claude-code-nextjs-skills, the plugin that ships this one along with the rest of its 24 skills, 2 agents, 2 MCP servers.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/laguagu/claude-code-nextjs-skills/next-best-practices/github.svg)](https://agentmods.dev/skills/laguagu/claude-code-nextjs-skills/next-best-practices)

Your own site

<a href="https://agentmods.dev/skills/laguagu/claude-code-nextjs-skills/next-best-practices"><img src="https://agentmods.dev/badge/skills/laguagu/claude-code-nextjs-skills/next-best-practices/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/laguagu/claude-code-nextjs-skills/next-best-practices"><img src="https://agentmods.dev/badge/skills/laguagu/claude-code-nextjs-skills/next-best-practices.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 66 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,113 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 86% copy Near-identical to another mod 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 5.1	$0.00066	$0.01113
Opus 5	$0.00033	$0.00557
Sonnet 5	$0.00013	$0.00223
Haiku 4.5	$0.00007	$0.00111

Measured 11d ago against content hash 32ccb07f2864, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

next-best-practices 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 11d 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.

Origin

This is a copy

86% identical to next-best-practices — 32 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.

skills/next-best-practices/SKILL.md · 158 lines

How it starts

The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Next.js Best Practices

Apply these rules when writing or reviewing Next.js code.

Cache Components patterns: When the project has cacheComponents: true in next.config.ts, use the separate cache-components skill for 'use cache', cacheLife(), cacheTag(), updateTag(), and revalidateTag() guidance.

File Conventions

See file-conventions.md for:

Project structure and special files
Route segments (dynamic, catch-all, groups)
Parallel and intercepting routes
Middleware rename in v16 (middleware → proxy)

RSC Boundaries

Detect invalid React Server Component patterns.

See rsc-boundaries.md for:

Async client component detection (invalid)
Non-serializable props detection
Server Action exceptions

Async Patterns

Next.js 15+ async API changes.

See async-patterns.md for:

Async params and searchParams
Async cookies() and headers()
Migration codemod

Runtime Selection

See runtime-selection.md for:

Default to Node.js runtime
When Edge runtime is appropriate

Directives

See directives.md for:

'use client', 'use server' (React)
'use cache' (Next.js)

Functions

See functions.md for:

Navigation hooks: useRouter, usePathname, useSearchParams, useParams
Server functions: cookies, headers, draftMode, after
Generate functions: generateStaticParams, generateMetadata

Error Handling

See error-handling.md for:

error.tsx, global-error.tsx, not-found.tsx
redirect, permanentRedirect, notFound
forbidden, unauthorized (auth errors)
unstable_rethrow for catch blocks

Data Patterns

See data-patterns.md for:

Server Components vs Server Actions vs Route Handlers
Avoiding data waterfalls (Promise.all, Suspense, preload)
Client component data fetching

Route Handlers

Read the full file on GitHub · 158 lines

Files

What ships with it

19 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.

11d ago First seen · 158 lines · 66 tokens per session scan A 32ccb07f2864

Subscribe to this mod's changes

next-best-practices is a skill published in the GitHub repository laguagu/claude-code-nextjs-skills (62 stars, last pushed 8d ago), licensed MIT. It adds 66 tokens to every session and 1,113 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to next-best-practices, differing in 32 lines, and is treated as a copy.

Claude Code Frontend React anthropic-skills claude mcp nextjs nextjs16

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next-best-practices