# Feature Doc Entity
### Scope
- **Purpose**: Document what `derive_tools_meta` does and why each capability exists.
- **Responsibility**: Master index for all feature doc instances in this crate.
- **In Scope**: Instance 001 — derive macro collection for common trait implementations.
- **Out of Scope**: Implementation mechanics and public interface contracts — see `api/` instances.
### Overview Table
| 001 | [Derive Macros](001_derive_macros.md) | Collection of derive macros for common trait implementations | ✅ |