# Feature Doc Entity

### Scope

- **Purpose**: Document what `derive_tools` does and why it exists as a unified facade.
- **Responsibility**: Master index for all feature doc instances in this crate.
- **In Scope**: Instance 001 — aggregate facade over workspace and external derive macros.
- **Out of Scope**: Public interface contracts — see `api/` instances.

### Overview Table

| ID | Name | Purpose | Status |
|----|------|---------|--------|
| 001 | [Aggregate Facade](001_aggregate_facade.md) | Unified facade aggregating workspace and external derive macros | ✅ |
