domain-expert

# Domain Expert Skill

## Purpose

Discover, learn, and guide domain knowledge. Helps understand project concepts, terminology, and how to map requests to domain patterns.

## Quick Reference

- **Provides:** Domain knowledge, concept explanations, request mapping
- **Modes:** configure, learn, explain, map

## Modes Overview

| Mode | Command | Purpose |
|------|---------|---------|
| **configure** | `/domain configure` | Read domain knowledge from docs |
| **learn** | `/domain learn` | Infer domain from code analysis |
| **explain** | `/domain explain <concept>` | Answer questions about a concept |
| **map** | `/domain map <request>` | Map request to domain concepts |

---

### Configure Mode: `/domain configure` (Setup)

Discovers domain knowledge from existing documentation.

```bash
/domain configure
```

**What it checks:**
- CLAUDE.md (Domain section)
- README.md (Project overview)
- docs/domain.md, docs/glossary.md
- docs/ADR/*.md (Architecture Decision Records)

**Output:**
```
## Discovered Domain Knowledge

**Project:** E-commerce platform
**Confidence:** High (domain.md found)

### Glossary (12 terms)
| Term | Definition |
|------|------------|
| Customer | User who has made a purchase |
| Order | Customer's request to purchase items |
| Cart | Collection of items before checkout |

### Entities (5 found)
| Entity | Description | Key Attributes |
|--------|-------------|----------------|
| Customer | Registered user | id, email, tier |
| Order | Purchase request | id, status, items |

### Business Rules (3 found)
| Rule | Context |
|------|---------|
| Orders can only be cancelled within 24h | Order cancellation |

**Save this configuration?** [Confirm / Adjust]
```

---

### Learn Mode: `/domain learn`

Analyzes domain code to infer entities, relationships, and patterns.

```bash
# Analyze all domain code (default)
/domain learn --analyze

# Learn from specific file
/domain learn --from src/domain/order/order.ts
```

**What it analyzes by language:**

|