21 lines
996 B
Markdown
21 lines
996 B
Markdown
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# ADR-0002: zod as schema source of truth
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**Status**: accepted · 2026-09
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**Context**: Business objects cross TS runtime ↔ Python skills; schema drift
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between languages is the classic failure. Someone must own the truth.
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**Decision**: Hand-written zod schemas in `packages/domain` are the only
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source. Build exports JSON Schema to `contracts/` (committed, versioned);
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pydantic models are generated from those (never hand-edited). Golden fixtures
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validated by both CIs. Data representation rules in docs/11 §3.3 are part of
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the contract (decimal strings for money, units in field names, etc.).
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**Alternatives**: Hand-written JSON Schema as neutral source (revisit if
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Python-side partners need co-ownership — the contracts/ layer stays identical);
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protobuf/gRPC (rejected: call volume doesn't need it, lineage snapshots should
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be human-readable, partner onboarding cost).
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**Consequences**: Python teams depend only on `contracts/`, never on TS
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internals — org boundary = code boundary.
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