AI Coding Project Boilerplate for Claude Code 🤖

Read this in other languages: 日本語

Agentic coding starter kit and workflow boilerplate for Claude Code — Build production-ready TypeScript projects with sub-agents, context engineering, and zero context exhaustion.

⚡ This boilerplate is for developers who want to:

• Build TypeScript projects faster with AI-driven workflows
• Avoid context exhaustion in long AI coding sessions
• Standardize team workflows with specialized AI agents

📖 Table of Contents

1. Quick Start (3 Steps)
2. Updating Existing Projects
3. Beyond Vibe Coding: Why Sub Agents?
4. Slash Commands
5. Customizing Skills
6. Skills System
7. Built with This Boilerplate
8. Documentation & Guides
9. Development Workflow
10. Project Structure
11. Package Manager Configuration
12. Multilingual Support
13. FAQ

⚡ Quick Start (3 Steps)

# 1. Create your project
npx create-ai-project my-project

# 2. Install dependencies (automatic)
cd my-project && npm install

# 3. Launch Claude Code and configure
claude                    # Launch Claude Code
/project-inject          # Set up project prerequisites (read every session by AI)
/implement <your feature> # Start building!

💡 First time? Check the Quick Start Guide for detailed setup instructions

🔄 Updating Existing Projects

Keep your project's agent definitions, commands, skills, and AI rules up to date. Run from your project's root directory:

# Preview changes without applying
npx create-ai-project update --dry-run

# Apply updates
npx create-ai-project update

How It Works

When you run npx create-ai-project update, the CLI:

1. Checks your project's .create-ai-project.json manifest for the current version
2. Compares it with the latest package version
3. Shows the CHANGELOG for review
4. Replaces managed files with the latest versions
5. Regenerates active directories for your language setting

What Gets Updated

Your source code (src/), package.json, and other project files are never touched.

Protecting Customized Files

If you've customized a file and don't want it overwritten:

# Add to ignore list
npx create-ai-project update --ignore skills project-context
npx create-ai-project update --ignore agents task-executor
npx create-ai-project update --ignore commands implement
npx create-ai-project update --ignore CLAUDE.md

# Remove from ignore list
npx create-ai-project update --unignore skills project-context

Ignored files are preserved during updates. Note that ignoring files may cause version mismatch with other updated components.

First Run on Existing Projects

If your project was created before the update feature, just run npx create-ai-project update from your project's root directory. It will automatically initialize the manifest by detecting your language from .claudelang.

🚀 Beyond Vibe Coding: Why Sub Agents?

As teams move beyond vibe coding, agentic coding — delegating structured workflows to specialized AI agents — is gaining traction as a practical approach. This boilerplate implements that approach with Claude Code sub-agents:

Traditional AI coding struggles with:

• ❌ Losing context in long sessions
• ❌ Declining code quality over time
• ❌ Frequent session restarts for large tasks

Sub agents solve this through context engineering:

• ✅ Splitting work into specialized roles (design, implementation, review)
• ✅ Each agent gets fresh, focused context — no exhaustion
• ✅ Handling large projects without degradation

This works because Claude Code's sub-agent mechanism runs each agent in its own context window. The parent session delegates tasks, and each sub-agent starts with a clean, focused context. Quality checks (lint, type check, test, build) run locally before each commit — not in CI. The feedback loop stays fast, and code is already verified when it's pushed.

👉 Learn more about Sub Agents (Anthropic docs)

📸 Demo

Sub agents working together on a TypeScript project

📝 Slash Commands

Essential commands for Claude Code:

Frontend equivalents (/front-design for UI Spec + Design Doc, /front-build, /front-review, /front-plan) and utility commands (/add-integration-tests, /update-doc) are also available.

Full command reference →

🌱 Customizing Skills

This boilerplate ships with general-purpose skills that work out of the box. But skills reach their full potential when you tailor them to your project — your coding conventions, domain constraints, and team decisions.

Think of the included skills as a baseline. The next step is making them yours:

• /project-inject — Capture project-specific prerequisites (run once, referenced every session)
• /create-skill — Create a new skill through interactive dialog
• /refine-skill — Improve an existing skill with optimization review

For principles and best practices on writing effective skills, see the Skills Editing Guide.

Validating Skill Effectiveness

Creating a skill is one thing — knowing whether it actually improves agent behavior is another. Skills interact with each other and with project context, so the only reliable way to know is to run with and without the skill and compare results.

rashomon is a Claude Code plugin for this. Use it when you want evidence, not intuition, that a skill change made things better.

🎨 Skills System

This boilerplate provides the principles used in agentic implementation workflows as skills, making them available for reference in everyday tasks as needed.

Applied Skills

👉 Learn how Skills work (Claude Code docs)

🎯 Built with This Boilerplate

⏱️ Time Comparison

• Without this boilerplate: ~1 week for setup + infrastructure
• With this boilerplate: ~2 days to production-ready application

Success Stories

Sub Agents MCP Server — MCP server enabling Claude Code/Cursor CLI as sub agents ⏱️ Initial development in 2 days — test code makes up ~90% of the codebase, now in production

MCP Image Generator — AI image generation via Gemini API ⏱️ Initial development in 1.5 days — complete creative tool with multi-image blending and character consistency

Both were built using the default /implement workflow — no manual agent orchestration needed.

See these projects: sub-agents-mcp ・ mcp-image

📚 Documentation & Guides

• Quick Start Guide - Get running in 5 minutes
• **[Use Cases & Commands](docs/guides/en/u