# Tasks — native-messaging

> Every checkbox MUST reflect work actually done in this change. Do not retroactively tick boxes for work that was already in main when this change opened. Do not tick a box for a test that doesn't exist or doesn't pin the requirement it claims to verify. Retroactive ticking is the failure mode this template guards against.

## 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

- [ ] 1.1 Read `MIGRATION.md` Sections 3.5, 4, 8, and 9 for package requirements and sequencing
- [ ] 1.2 Read `openspec/AGENTS.md` Sections 13 and 14
- [ ] 1.3 Draft `proposal.md` from `openspec/templates/proposal.md`
- [ ] 1.4 Draft `specs/native-messaging/spec.md` from `openspec/templates/spec-delta.md`
- [ ] 1.5 Every requirement in the spec delta carries a `**Verified by:**` line naming concrete `it(...)` titles

## 2. Implementation

- [ ] 2.1 Scaffold package at `packages/plugin/native-messaging` with `package.json`, `tsconfig.json`, `vitest.config.ts`
- [ ] 2.2 Implement `Handshake` class in `src/handshake/handshake.ts` using `@suaveplan/crypto-curve` X25519
- [ ] 2.3 Implement `FrameEncoder` / `FrameDecoder` in `src/frame/frame.ts` using `@suaveplan/crypto-cipher` ChaCha20-Poly1305
- [ ] 2.4 Implement `ChromeTransport`, `FirefoxTransport`, `SafariTransport` in `src/transport/` with common `Transport` interface
- [ ] 2.5 Implement `NativeMessagingClient` in `src/client/client.ts` with typed request/response envelope
- [ ] 2.6 Implement `NativeMessagingHost` in `src/host/host.ts` with session-per-connection isolation
- [ ] 2.7 Implement `ReconnectPolicy` in `src/reconnect/reconnect.ts` with injectable `Clock`
- [ ] 2.8 Implement `NativeMessagingError` hierarchy in `src/error/error.ts` with error codes
- [ ] 2.9 Add subpath exports in `package.json` for every feature module
- [ ] 2.10 Wire Zod schemas at every external boundary (message parse, config validation)
- [ ] 2.11 Wire injectable `Rng` through Handshake options and transport config

## 3. Tests

- [ ] 3.1 Unit tests at `src/handshake/handshake.test.ts` covering every scenario
- [ ] 3.2 Unit tests at `src/frame/frame.test.ts` covering every scenario
- [ ] 3.3 Unit tests at `src/transport/transport.test.ts` covering every scenario
- [ ] 3.4 Unit tests at `src/client/client.test.ts` covering every scenario
- [ ] 3.5 Unit tests at `src/host/host.test.ts` covering every scenario
- [ ] 3.6 Unit tests at `src/reconnect/reconnect.test.ts` covering every scenario
- [ ] 3.7 Unit tests at `src/error/error.test.ts` covering every scenario
- [ ] 3.8 Spec-conformance tests at `src/spec-conformance.test.ts` pinning structural invariants
- [ ] 3.9 Integration / contract tests for full client-host encrypted round-trip
- [ ] 3.10 Every `it(...)` carries `{ timeout: 5000 }` (or 30000 for genuinely async)
- [ ] 3.11 Property-based tests for frame encryption round-trip with random payloads

## 4. Documentation

- [ ] 4.1 Sibling `.md` for every implementation `.ts` (≥200 words, basic + advanced examples, full API reference)
- [ ] 4.2 README links every co-located `.md` under `## Modules`
- [ ] 4.3 Update `CLAUDE.md` package listing

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

- [ ] 5.1 `bun run check` — Biome 0 errors / 0 warnings / 0 info across the whole monorepo
- [ ] 5.2 `bunx turbo lint typecheck test --filter=@suaveplan/native-messaging` — green
- [ ] 5.3 `bunx turbo test:coverage --filter=@suaveplan/native-messaging` — 100/100/100/100
- [ ] 5.4 `bun scripts/openspec-conformance.ts @suaveplan/native-messaging` — exit 0, no `error` findings
- [ ] 5.5 `bunx turbo build --filter=@suaveplan/native-messaging` — green

## 6. Pre-archive 7-row checklist (AGENTS.md Section 13)

- [ ] 6.1 Generics threaded; `expectTypeOf` assertions on every literal-type claim
- [ ] 6.2 Zod schemas wired at every declared boundary
- [ ] 6.3 Every error code in `error-codes.ts` thrown by at least one production path
- [ ] 6.4 Strict-mode behaviors tested both on and off
- [ ] 6.5 OTel instruments emitted from production paths and asserted with a real in-memory `MeterProvider`
- [ ] 6.6 Lifecycle dedup tested where claimed (in-flight Promise, idempotent set/load)
- [ ] 6.7 No retroactive tick — every box above reflects work done in this change

## 7. Archive

- [ ] 7.1 Fold spec delta into `openspec/specs/native-messaging/spec.md`
- [ ] 7.2 Move `openspec/changes/native-messaging/` → `openspec/archive/2026-04-29-native-messaging/`
- [ ] 7.3 Refresh `MANIFEST.md` if package set or deps changed