Event Service Agent Kata

Kanban (Legacy Archive)

⚠️ ARCHIVED: This file is preserved for historical context. Issue tracking has moved to Beads (bd).

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Issues from this Kanban have been migrated to Beads with their original PL-# IDs preserved as labels.

WIP limits: Doing ≤ 2. Keep Ready small (≤ 7).

Inbox

(PL-13) Choose broker adapter details for dev/prod parity [adr: ADR-0002]
(PL-20) Confirm monolith boundaries (API inside vs separate; Execution worker split) [adr: ADR-0001]
(PL-9) Observability baseline [adr: ADR-0009] [infra] — blocked by [adr: ADR-0002]

Ready

(PL-2) Orchestration core domain model and transitions Orchestration
(PL-3) Broker adapter implementation + local broker setup [infra]
(PL-5) Execution module with mock HttpClientPort Execution
(PL-6) Persistence adapter (SQLite) and migrations [infra]
(PL-7) API server with submit/list/detail routes Api

Doing (WIP ≤ 2)

(PL-4.4) Timer module entry point & polling loop Timer — branch timer/pl-4.4-polling-worker. FINAL STAGE: Documentation only, all functionality complete.
- (PL-4.4.1) Layer composition (TimerLive) — compose adapters, verify no missing deps
- (PL-4.4.2) Polling loop — PollingWorker.run with Schedule.fixed(5s), error recovery, 4 tests passing
- (PL-4.4.3) Command subscription — inlined in main, retry with exponential backoff (3 retries)
- (PL-4.4.4) Module main program (Timer.main) — forkScoped for polling, command subscription in main fiber
- (PL-4.4.5) Integration tests — 11/13 passing (2 skipped: retry policy + error injection blocked), full E2E coverage
- (PL-4.4.6) Documentation & export — update README, design docs, package exports

Blocked

(PL-9) Observability baseline [adr: ADR-0009] [infra] — blocked by [adr: ADR-0002]

Done (recent)

(PL-4.6) SQLite persistence adapter Timer — COMPLETE: 3-phase implementation with TDD discipline. Phase 0 (Bootstrap): Created test-driven SQLite adapter foundation with migrations, FK constraints, and dual-layer pattern (Live/Test). Phase 1 (SQLite Adapter): Implemented full CRUD operations (save, find, findScheduledTimer, findDue, markFired, delete) with idempotency, tenant isolation, and state transitions. Removed HashMap inMemory adapter (189 lines). Migrated all 54 tests to it.scoped() pattern with SQL.Test layers. Created withServiceCall() fixture for FK constraint satisfaction. Made correlation_id optional in schema (migration 0003). Fixed Effect.fn.Return<A, E, R> signatures in workflows. Phase 2 (Test Consolidation): Line-by-line coverage verification confirmed all 13 inMemory tests were duplicates or superseded by Test suite’s 20 tests (including unique tenant isolation, ordering, global polling scenarios). Deleted duplicate inMemory suite (413 lines, 33→20 tests). Flattened test structure (removed nested describe('Test') wrapper). Final state: 20 adapter tests (310 total suite), all passing in 3.52s. Commits: 5147052, edb8035
(PL-24) Implement MessageMetadata Context for correlationId propagation [Timer] [platform] [docs] [adr: ADR-0013] — COMPLETE: PR#37 merged (Nov 6, 2025). Option E (Ambient Context) implementation. Created MessageMetadata Context.Tag with correlationId/causationId fields. Updated TimerEventBusPort signatures to require MessageMetadata in R parameter (asymmetric pattern). Refactored both workflows (pollDueTimersWorkflow, scheduleTimerWorkflow) to provision Context. Updated 22 tests, activated 2 correlation propagation tests. Fixed broken distributed tracing after PL-23. Removed false makeEnvelope references from 6 docs (ADR-0011, ADR-0009, 4 design docs). Updated to dual-level observability strategy (Phase 1 complete, Phase 2 planned). 280/282 tests passing. Commit: 3d49ca6
(PL-23) Refactor EventBusPort to use pure domain types [Timer] [architecture] — COMPLETE: Option B2 implementation with 15 commits across 4 phases. Port accepts pure domain events (DueTimeReached), adapter wraps in MessageEnvelope. Test layer refactoring (Phase 1-3): fixed composition → extracted base layers → migrated to @effect/vitest layer(). Workflow updated (TDD RED-GREEN): construct domain events before publishing. Final REFACTOR phase: extracted BaseTestLayers (10/13 tests simplified, 3 kept explicit for test isolation). All 282 tests passing. Branch: timer/pl-23-pure-domain-events-at-port (ready for merge).
(PL-15) Migrate to Schema.DateTimeUtc [schemas, timer, platform] — PR #34 (draft): Completed all 5 migrations (DateTime.Utc, Option, branded types, cross-field validation, naming consistency). 282 tests passing, backward compatible wire format, comprehensive documentation updates.
(PL-14.2) Migrate platform message interfaces → @event-service-agent/schemas [schemas]
(PL-14.5) Update documentation (ADRs, design docs) [docs] — COMPLETE: Updated ports.md reference to schemas package
(PL-14.4) Update module dependencies + imports [all modules] — COMPLETE: All active modules (timer, schemas) updated; placeholder modules have no code yet
(PL-14.3) Rename contracts → platform + update refs [platform] — COMPLETE: Package renamed, 7 READMEs added, all imports fixed, 142 tests passing
(PL-14.2) Create @event-service-agent/schemas package [schemas] — IN PROGRESS: migrating remaining platform message interfaces to Effect Schemas
(PL-14.1) Document package split decision [contracts] [adr: ADR-0012] — COMPLETE: ADR-0012 created, documents schemas/platform split rationale
(PL-4.5) In-memory test adapters Timer — PR ready: Full state machine persistence (Scheduled → Reached), 16/16 tests passing, two-operation query model (findScheduledTimer/find), Effect.acquireRelease lifecycle, idempotency guarantees
(PL-4.3) ScheduleTimer workflow + tests Timer — PR #25: scheduleTimerWorkflow with Effect.fn, 8/9 tests passing, TimerPersistence.inMemory adapter (Layer.effect + Ref + HashMap)
(PL-4.2) Port interfaces (Clock, EventBus, Persistence) Timer — PR #20 merged
(PL-4.1) TimerEntry domain model + tests Timer — PR #19 merged: Effect Schema with TaggedClass, DateTime.Utc, all tests passing
(PL-1) Scaffold contracts package with message and port types [contracts] — PR #17 merged: 5 branded types, 3 commands, 9 events, MessageEnvelope
(PL-22) Migrate from Node.js + pnpm to Bun runtime [infra] — Runtime migration complete
(PL-12) Database structure decision (shared vs separate files) — Accepted [adr: ADR-0004]
(PL-19) Timer delegation strategy (custom vs broker delay) — Accepted [adr: ADR-0003]
(PL-21) Correct NATS delay capability evaluation in ADR-0002 — PR merged

Notes (today)

PL-4.4 ALMOST DONE (Dec 9, 2025): Timer.main fully functional with 11/13 integration tests passing. All core features working: polling, command subscription, multi-tenancy, idempotency, fiber lifecycle. 2 tests skipped (documented blockers: retry policy + error injection layer composition). Next: Documentation only (PL-4.4.6) — README, design docs, exports. Ready to merge in ~1-2 hours.
Error injection tests: Attempted implementation revealed architectural constraint (can’t access ports before TestHarness provides them). Applied YAGNI principle — documented pattern, skipped tests, deferred to workflow-level testing.
Test suite health: 327/329 tests passing (2 skipped), 20 commits on feature branch, all conventional commits, no regressions.

Legend

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