Files
oikos/docs/adr/0004-openapi-first.md
dtoro 18cb79caf9 oikos phase 0: ontology + inventory + policy seeds, OpenAPI contract, ADRs
- seeds/ontology.yaml: 59 entity types (5 abstract, is-a hierarchy), 46
  relationship types with cardinality, 6 lifecycles with terminal states
  and named precondition checks
- seeds/inventory.yaml: 110 entities / 142 relationships translated from
  legacy inventory.yaml (fleet, services, ingress, storage, governance,
  archaeology); thin spots marked for backfill
- seeds/policy.yaml: 4 risk classes, 27 approval rules (hierarchy-aware,
  per-entity overrides), autonomy kill-switch off (cold start)
- api/openapi.yaml: full v1 REST contract (40 paths), RFC 9457 errors,
  cursor pagination, idempotency, ETag/If-Match, scopes; redocly-clean
- docs/adr/0001-0010: initial architecture decision records
- scripts/validate-seeds.py: Phase 0 gate — hierarchy, lifecycles,
  endpoints, cardinality, policy cross-refs (0 errors)
- plan: layer CHECK gains 'meta' (root type), cardinality gains
  'many-to-one'

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-07 00:17:15 +02:00

941 B

ADR 0004 — Contract-first OpenAPI API

Status: accepted (2026-07-07) · Plan: rev 3, R3-2/R3-3

Context

Future UIs, a CLI client, and an MCP surface must stay in sync with the API. Code-first (Gin + generated docs) drifts.

Decision

api/openapi.yaml (OpenAPI 3.1) is the source of truth. Server stubs via oapi-codegen (strict server, chi router); clients generated for Go (CLI) and TypeScript (future UI). Conventions: RFC 9457 problem+json errors, {items, next_cursor} envelopes, cursor pagination, Idempotency-Key on unsafe POSTs, ETag/If-Match optimistic concurrency, scopes (operator/viewer/agent) annotated per operation. CI fails on spec/handler drift. MCP tools wrap the same service layer.

Consequences

  • UI development needs only the running API (spec served at /openapi.yaml).
  • Handler changes require spec changes first — deliberate friction.
  • Breaking changes ship as /api/v2 side by side; v1 is additive-only.