Menu
Start new domain entities from the type layer before repository, service, runtime, or UI code
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.
Based on SOC occupation classification
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