jcl-migration-analyzer

• [🤔 What is Spec-Driven Development?](#-what-is-spec-driven-development)
• [⚡ Get Started](#quick-start)
• [🤖 Supported AI Agents](#-supported-ai-agents)
• [🔧 Rainbow CLI Reference](#-rainbow-cli-reference)
• [📚 Core Philosophy](#spec-driven-development-sdd)
• [🌟 Development Phases](#-development-phases)
• [🔧 Prerequisites](#-prerequisites)
• [📖 Learn More](#-learn-more)
• [📋 Detailed Process](#-detailed-process)
• [🔍 Troubleshooting](#-troubleshooting)
• [👥 Maintainers](#-maintainers)
• [💬 Support](#-support)
• [🙏 Acknowledgements](#-acknowledgements)
• [📄 License](#-license)

Traditional approach: Write code first, figure it out as you go.

Spec-Driven approach: Define what you want first, then let AI build it right.

For decades, we treated specifications as throwaway notes—just a formality before the "real" coding began. Spec-Driven Development flips this around: your specification becomes the blueprint that directly generates working code, not just a suggestion.

> Think of it like architecture: You wouldn't build a house without blueprints. Why build software without clear specifications?

Development Approaches

Hanoi Rainbow supports both Greenfield (new projects) and Brownfield (existing projects) development:

```mermaid

flowchart LR

Start([Project Type?])

Start --> Greenfield[🌱 Greenfield
New Project]

Start --> Brownfield[🏗️ Brownfield
Existing Project]

Greenfield --> GF1[📋 Regulate
Set Principles]

GF1 --> GF2[🎯 Specify
Define Features]

GF2 --> GF3[🔍 Clarify
Refine Requirements]

GF3 --> GF4[📝 Architect
System Design]

GF4 --> GF5[📏 Standardize
Coding Rules]

GF5 --> GF6[🛠️ Design
Technical Plan]

GF6 --> GF7[📋 Taskify
Break Down Tasks]

GF7 --> GF8[⚡ Implement
Build Features]

GF8 --> GF9[✅ Test & Deploy]

Brownfield --> BF1[📚 Assess Context
Analyze Codebase]

BF1 --> BF2[📋 Regulate
Update Principles]

BF2 --> BF3[🎯 Specify
New Feature]

BF3 --> BF4[🔍 Clarify
Requirements]

BF4 --> BF5[🛠️ Design
Integration Plan]

BF5 --> BF6[📋 Taskify
Task Breakdown]

BF6 --> BF7[⚡ Implement
Add Feature]

BF7 --> BF8[✅ Test & Deploy]

style Greenfield fill:#90EE90

style Brownfield fill:#87CEEB

style GF8 fill:#FFD700

style BF7 fill:#FFD700

```

Greenfield projects start with establishing principles, architecture, and standards before building features. Brownfield projects begin with /rainbow.assess-context to understand existing architecture and patterns, then follow a streamlined workflow to add new features while maintaining consistency.

Key Differences:

| Aspect | 🌱 Greenfield | 🏗️ Brownfield |

|--------|--------------|---------------|

| Starting Point | Empty project | Existing codebase |

| Setup Phase | /rainbow.regulate | /rainbow.assess-context (once per project) |

| Focus | Establish foundations first | Integrate with existing patterns |

| Timeline | 2-4 weeks (MVP