# Tasks — `@suaveplan/api-2pc`

> Every checkbox MUST reflect work actually done in this change.

## 0. Pre-flight (non-negotiable)

- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.

## 1. Spec authoring

- [x] 1.1 Read design doc §9.2 (2PC) and §9.3 (engine choice)
- [x] 1.2 Read umbrella `openspec/changes/api-plugin-foundation/proposal.md` (Stage 6 acceptance)
- [x] 1.3 Read `openspec/AGENTS.md` Sections 13 and 14
- [x] 1.4 Draft `proposal.md` from `openspec/templates/proposal.md`
- [x] 1.5 Draft `specs/api-2pc/spec.md` from `openspec/templates/spec-delta.md`
- [x] 1.6 Every requirement carries a `**Verified by:**` line

## 2. Implementation

- [x] 2.1 Scaffold `packages/api/api-2pc/` (`"version": "0.1.0"`, `"sideEffects": false`)
- [x] 2.2 `src/coordinator/coordinator.ts` — `createTwoPcCoordinator` + `run2pc`
- [x] 2.3 `src/registry/participant-registry.ts` — refusal of non-preparable engines as writers, read-only voter path
- [x] 2.4 `src/phases/prepare.ts` — Phase 1: collect votes; emit `2pc.prepare` spans + histogram
- [x] 2.5 `src/phases/commit.ts` — Phase 2 commit: `COMMIT PREPARED` against every participant; emit `2pc.commit` instruments
- [x] 2.6 `src/phases/rollback.ts` — Phase 2 abort path: `ROLLBACK PREPARED` everywhere; idempotent
- [x] 2.7 `src/persistence/persistence.ts` — CRUD over `suaveplan_2pc_transactions` (schema owned by `api-host`)
- [x] 2.8 `src/recovery/recovery.ts` — boot-time orphan resolution via `pg_prepared_xacts`; commit / rollback per ledger state
- [x] 2.9 `src/limits/outstanding-cap.ts` — enforce default 256 outstanding-prepared cap; configurable via host config
- [x] 2.10 `src/limits/timeout-ceiling.ts` — refuse `timeoutMs > 30000` at call time
- [x] 2.11 `src/instruments/instruments.ts` — span/counter/histogram/gauge per design §9.2
- [x] 2.12 `src/error-codes.ts` — 10 `TWOPC_*` codes
- [x] 2.13 `./testing` subpath — `run2pcParticipantConformance`
- [x] 2.14 `src/index.ts` — explicit named re-exports

## 3. Tests

- [x] 3.1 Unit tests per module, every `it(...)` `{ timeout: 5000 }`
- [x] 3.2 `src/coordinator/coordinator.spec-conformance.test.ts` — conformance suite
- [x] 3.3 `src/recovery/recovery.test.ts` — Postgres integration via `@suaveplan/testing-integration-postgres` (`{ timeout: 30000 }`)
- [x] 3.4 `tests/integration/postgres-2pc.test.ts` — full commit + abort + recovery (`{ timeout: 60000 }`)
- [x] 3.5 All test files import runner primitives from `@suaveplan/testing/runner`

## 4. Documentation

- [x] 4.1 Sibling `.md` for every implementation `.ts`
- [x] 4.2 `README.md` listing `## Modules`; call out the Postgres-only writer constraint at the top

## 5. Pre-archive verification (the 5-gate triple)

- [x] 5.1 `bun run check` — 0/0/0
- [x] 5.2 `bunx turbo lint typecheck test --filter=@suaveplan/api-2pc` — green
- [x] 5.3 `bunx turbo test:coverage --filter=@suaveplan/api-2pc` — 100/100/100/100
- [x] 5.4 `bun scripts/openspec-conformance.ts @suaveplan/api-2pc` — exit 0
- [x] 5.5 `bunx turbo build --filter=@suaveplan/api-2pc` — green

## 6. Pre-archive 7-row checklist

- [x] 6.1 Generics threaded; `expectTypeOf` on every literal-type claim
- [x] 6.2 Zod schemas wired at every boundary
- [x] 6.3 Every `TWOPC_*` code thrown by production paths
- [x] 6.4 Strict-mode behaviour tested both on and off (timeout ceiling, outstanding cap)
- [x] 6.5 OTel instruments asserted against an in-memory `MeterProvider`
- [x] 6.6 Lifecycle dedup: re-running `recovery` is a no-op once orphans are resolved
- [x] 6.7 No retroactive tick — every box reflects work in this change

## 7. Archive

- [x] 7.1 Fold spec delta into `openspec/specs/api-2pc/spec.md`
- [x] 7.2 Move to `openspec/archive/<yyyy-mm-dd>-api-2pc/`
- [x] 7.3 Tick Stage-6 row in umbrella tasks
- [x] 7.4 Refresh `MANIFEST.md`