--- name: package-relationships description: > Canonical @eristack package dependency map, layer order, ERP vs HTTP vs ledger stacks, and which ai-knowledge skill to load first. Use before composing multiple packages or when recipes overlap (erp, compose-spine, document-lines). metadata: type: core sources: - 'eristack/business-libs:packages/ai/ai-knowledge/knowledge/package-relationships.md' --- # Package relationships Load **once**: `knowledge/package-relationships.md`. ## Quick routing | Ask | First skill | | --- | --- | | Document with QUPS lines | `@eristack/ai-knowledge#document-lines-erp` | | Backseat mock → Drizzle API | `@eristack/ai-knowledge#backseat-then-backend` | | Which packages to install | This skill, then `loadPlan()` | | Generic REST shell | `@eristack/rest#rest-core` — not opinion | | ERP PATCH actions | `@eristack/opinion#opinion-core` | ## Rules - **Primitives** do not depend on services. **Core** never imports Express/React/Drizzle. - **percent** for config rates; **qups + money** for line math — do not duplicate. - Stock / GL / valuations are **optional modules**, not defaults for job/invoice ERPs. - Horizon A: use `registerHorizonDocumentSpine` from `@eristack/backseat/seeds` + app hooks for grids/graphs. Monorepo maintenance: `pnpm debottleneck:check`.