# Invariant Doc Entity
### Scope
- **Purpose**: Document non-negotiable behavioral constraints governing every implementation decision in `api_openai_compatible`.
- **Responsibility**: Master file listing all invariant instances with ID, name, and enforcement status.
- **In Scope**: Design-level constraints applying universally across the crate — governing principles, test mandates, policy rules.
- **Out of Scope**: Feature-specific behaviors (see `feature/`), API contracts (see `api/`), implementation patterns.
### Overview Table
| 001 | [Thin Client Principle](001_thin_client_principle.md) | No automatic or implicit behaviors; all client actions must be explicit | ✅ |
| 002 | [Testing Standards](002_testing_standards.md) | No-mock mandate and loud-failure requirement for all integration tests | ✅ |