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Start new domain entities from the type layer before repository, service, runtime, or UI code
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Baseado na classificação ocupacional SOC
Keep environment variables and deploy-time settings inside a typed config boundary
Enforce six-layer forward-only imports: types -> config -> repositories -> services -> runtime -> ui
Write ADRs for harness boundaries, provider choices, dependency exceptions, and enforcement changes
Introduce the six-layer harness into an existing TypeScript project gradually
Fix six-layer harness violations reported by dependency-cruiser, ESLint, or review
Review a PR for six-layer harness, provider, ADR, and enforcement consistency
| name | type-first-entity |
| description | Start new domain entities from the type layer before repository, service, runtime, or UI code |
| metadata | {"type":"Playbook","origin":"harness-engineering/ch4","helpful":0,"harmful":0,"status":"active"} |
types, domain, or schema first.any / broad unknown leaks into inner layers