next-stage: Instructions file for Codex

AGENTS.md

next-stage AGENTS.md is an instructions file for Codex, OpenCode from Kazuki-tam/next-stage. It costs 2,789 tokens per session, scanned A, original, MIT.

A project guide for a Next.js web application, covering its technologies, folder layout, setup commands, testing, and production build process.

In plain words
What is it for?
Use it to start development, build the application, run tests, check code quality, and understand the project's main tools.
Why use it?
It gives coding agents the project context and commands they need, reducing guesswork when installing dependencies, running the app, or checking changes.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions CLAUDE.md; mentions AGENTS.md; mentions Gemini CLI.

This is Kazuki-tam/next-stage's own configuration. It tells Codex and OpenCode how to work on next-stage itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything next-stage configures →

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/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/Kazuki-tam/next-stage

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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agentmods badge for next-stage AGENTS.md

README.md
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Per session 2,789 This file is loaded in full into every session.
When invoked 2,789 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.02789 $0.02789
Opus 5 $0.01394 $0.01394
Sonnet 5 $0.00558 $0.00558
Haiku 4.5 $0.00279 $0.00279

Measured 8d ago against content hash d2c5b3618eea, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

next-stage AGENTS.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 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.

AGENTS.md · 370 lines

How it starts

The opening of the file, as written. The whole thing — 370 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Project Overview

Key Technologies:

  • Framework: Next.js 16.3.0 with App Router
  • Runtime: React 19.2.8, React DOM 19.2.8
  • Language: TypeScript 5.9.3
  • Package Manager: Bun 1.3.14
  • API Framework: Hono 4.13.0
  • API Validation: @hono/zod-validator 0.7.6
  • UI Components: shadcn/ui with Radix UI
  • Styling: Tailwind CSS 4.3.3
  • Form Management: React Hook Form 7.84.0 + Zod 4.4.3
  • Icons: lucide-react 1.28.0
  • Testing: Playwright 1.61.1 + Bun test runner
  • Code Quality: Biome 2.3.8 + Markuplint 4.18.3

Setup Commands

# Install dependencies
bun install

# Start development server (Turbopack is default in Next.js 16)
bun dev

# Build for production
bun build

# Start production server
bun start

# Run all tests
bun run test:unit && bun run test:e2e

# Run code quality checks (linting + formatting)
bun run check

Development Environment

Package Manager

  • Primary: Use bun for all package management and script execution
  • Performance: Turbopack is the default bundler in Next.js 16 for faster development builds
  • Hot Reload: Development server runs on http://localhost:3000 with auto-refresh

Directory Structure

Follow the established colocation pattern:

src/
├── app/                    # Next.js App Router routes
│   ├── _components/        # App-specific components
│   ├── _styles/           # App-specific styles
│   └── page.tsx           # Route pages
├── components/            # Reusable UI components
│   ├── layout/           # Layout-specific components
│   └── ui/               # shadcn/ui components
├── config/               # Configuration files
├── lib/                  # Utility functions and shared logic
└── types/                # Shared type definitions

File Naming Conventions

  • Use lowercase with dashes for directories: auth-user/, user-profile/
  • Use underscore prefix for page-specific directories: _components/, _actions/, _hooks/
  • Component files: PascalCase with .tsx extension
  • Utility files: camelCase with .ts extension

Read the full file on GitHub · 370 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.

  1. 8d ago First seen · 370 lines · 2,789 tokens per session scan A d2c5b3618eea

Subscribe to this mod's changes

next-stage AGENTS.md is an instructions file published in the GitHub repository Kazuki-tam/next-stage (12 stars, last pushed 1mo ago), licensed MIT. It adds 2,789 tokens to every session, about $0.0139 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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