# Docs
## Scope
Design and API documentation for `mod_interface`.
### Responsibility Table
| `feature/` | Navigational hubs for user-facing macro capabilities |
| `invariant/` | Properties that must always hold in the namespace layer system |
| `api/` | DSL operations and directive contract for the mod_interface! macro |
| `pattern/` | Architectural patterns governing the five-layer cascade and crate structure |
| `entities.md` | Cross-entity index: all doc entity types and doc instances |
| `doc_graph.yml` | Cross-entity dependency graph for all doc instances |