# Invariant Test Specs

### Scope

- **Purpose**: Document test cases verifying that cli_fmt architectural invariants hold.
- **Responsibility**: Test specification verifying the cli_fmt/strs_tools architectural boundary invariant.
- **In Scope**: IN-prefixed spec for Invariant 001 (architectural boundary between cli_fmt and strs_tools).
- **Out of Scope**: Feature behavioral tests — see `tests/docs/feature/`.

### Overview Table

| # | File | Name | Status |
|---|------|------|--------|
| 1 | [001_architectural_boundary.md](001_architectural_boundary.md) | Architectural Boundary | ✅ |
