- Phase 1: state, prompts, tools registry (13 tests) - Phase 2: AI adapters, security classifier, sandbox/executors (54 tests) - SecurityClassifier: 21 tests covering classify() with edge cases - SandboxEnvironment: 5 tests for create/cleanup/list_files - DirectExecutor: 3 tests with mocked subprocess - SandboxExecutor: 6 tests with mocked subprocess - Phase 3: schemas (8 tests)