# API Doc Entity
### Scope
- **Purpose**: Document the public macro API — signatures, behavior, and guarantees.
- **Responsibility**: Registry and overview of all API doc instances.
- **In Scope**: All variadic constructor macros (9 strict + 9 into); collection type re-exports.
- **Out of Scope**: Behavioral invariants (see `invariant/`), feature guides (see `feature/`).
### Overview Table
| 001 | [Collection Constructor Macros](001_collection_macros.md) | Variadic macros for creating standard collections | ✅ |