What is next-stage CLAUDE.md?

A project instruction file for developing a Next.js web application, including commands for running, checking, formatting, and testing it.

It documents Bun commands, unit and browser testing, linting, formatting, dependency updates, and rule generation for several AI coding editors.

It gives coding agents the repository's expected development and quality procedures in one place.

How Kazuki-tam/next-stage configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Kazuki-tam/next-stage. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Kazuki-tam/next-stage/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Kazuki-tam/next-stage

Made for: Claude Code.

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/instructions/kazuki-tam/next-stage/claude-md/github.svg)](https://agentmods.dev/instructions/kazuki-tam/next-stage/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/kazuki-tam/next-stage/claude-md"><img src="https://agentmods.dev/badge/instructions/kazuki-tam/next-stage/claude-md/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/instructions/kazuki-tam/next-stage/claude-md"><img src="https://agentmods.dev/badge/instructions/kazuki-tam/next-stage/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,546 This file is loaded in full into every session.

When invoked 1,546 The same file — it is already loaded in full.

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

Origin original 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 5.1	$0.01546	$0.01546
Opus 5	$0.00773	$0.00773
Sonnet 5	$0.00309	$0.00309
Haiku 4.5	$0.00155	$0.00155

Measured 10d ago against content hash 54fae13e9a69, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

next-stage CLAUDE.md 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 10d 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

Copies of this mod

1 near-identical copy found in the catalogue:

next-stage GEMINI.md — 91% identical, 10 lines differ

CLAUDE.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude CLI when working with code in this repository.

Commands

Development

bun dev          # Start development server (Turbopack is default in Next.js 16)
bun build        # Build for production
bun start        # Start production server

Code Quality

bun run lint     # Run all linters (Markuplint + Biome)
bun run check    # Run Biome check with auto-fixes + Markuplint
bun run format   # Format code with Biome

Testing

bun run test:unit       # Run unit tests
bun run test:e2e        # Run Playwright E2E tests
bun run test:e2e:ui     # Run E2E tests with UI
bun run test:codegen    # Generate E2E test code

AI Rules Generation

bun run rules           # Generate rules for all AI editors
bun run rules:cursor    # Generate Cursor-specific rules
bun run rules:windsurf  # Generate Windsurf-specific rules
bun run rules:copilot   # Generate GitHub Copilot instructions
bun run rules:kiro      # Generate Kiro-specific rules

Dependency Management

bun install             # Install dependencies
bun run upgradeps       # Upgrade dependencies interactively

Architecture Overview

This is a modern Next.js 16.3.0 starter template designed for AI-driven development with the following architecture:

Core Stack

Package Manager: Bun 1.3.14
Framework: Next.js 16.3.0 with App Router
Runtime: React 19.2.8, React DOM 19.2.8
Language: TypeScript 5.9.3 with strict mode
API: Hono 4.13.0 with @hono/zod-validator 0.7.6
UI: shadcn/ui with Radix UI primitives
Styling: Tailwind CSS v4.3.3
Forms: React Hook Form 7.84.0 + Zod 4.4.3 validation
Icons: lucide-react 1.28.0
Quality: Biome 2.3.8 (linting/formatting) + Markuplint 4.18.3
Testing: Playwright 1.61.1 + Bun test runner

Key Architectural Patterns

Server-First Development
- Default to React Server Components (RSC)
- Minimize 'use client' usage
- Wrap client components in Suspense

Read the full file on GitHub · 167 lines

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.

10d ago First seen · 167 lines · 1,546 tokens per session scan A 54fae13e9a69

Subscribe to this mod's changes

next-stage CLAUDE.md is an instructions file published in the GitHub repository Kazuki-tam/next-stage (12 stars, last pushed 1mo ago), licensed MIT. It adds 1,546 tokens to every session, about $0.0077 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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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.

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AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

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Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

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next-stage: Instructions file for Claude Code