# Feature Doc Entity
### Scope
- **Purpose**: Document optional feature behavior specifications for `api_xai`.
- **Responsibility**: Master file listing all feature doc instances with ID, name, and status.
- **In Scope**: Enterprise reliability modules, feature activation requirements, configuration contracts.
- **Out of Scope**: Core client HTTP transport (always-on via `enabled`), test utilities.
### Overview Table
| 001 | [Enterprise Reliability](001_enterprise_reliability.md) | Optional enterprise feature set — retry, circuit breaker, rate limiting, and more | ✅ |