# STATUS — 2026-10-10

## Where we are

Phase 1 (semantics core) is done and green. The first storage + MCP slice
is now built, tested, and green too.

**Done:**
- Repo `swaits/wanderbooks` created on git.swaits.com (private).
- `ledger-core` 0.1.0: `Money` (exact Decimal + ISO currency), five account
  types with normal sides, chart of accounts (codes, hierarchy,
  placeholders), journal entries with full validation, `Ledger` command
  surface (create/add-line/post/reverse), append-only posting log.
- Reports: trial balance, P&L, balance sheet (accounting equation holds;
  current earnings folded into equity pre-close), canonical JSON `snapshot()`
  for oracle diffing.
- 14 tests green: validation rejections, posted-entry immutability,
  reversal semantics, the accounting laws on a fixture company, a 300-entry
  randomized invariant test, and the first golden file.
- `ledger-store` 0.1.0: the source of truth is an append-only, hash-chained
  JSONL journal (fsync per append; tamper-evident); content-addressed
  SHA-256 blob store (immutable, deduplicated, hash-verified on read);
  SQLite as a *disposable* projection (TEXT amounts, WAL, `synchronous=FULL`,
  `integrity_check` on open). Single write path: validate → journal →
  mutate → apply. `verify` replays the journal and diffs reports three ways;
  `rebuild` drops SQLite and replays; a missing database heals on open.
  7 tests green: round-trip, tamper detection, torn-tail truncation,
  rebuild, blob dedup/corruption detection, unbalanced-post rejection.
- `ledger-mcp` 0.1.0: stdio server on official rmcp 3.5 (18 narrow typed
  tools, amounts as decimal strings, `initialize.instructions` carrying the
  agent operating contract). Draft → add lines → preview → confirmed post;
  server-side receipt policy (strictly greater than $25, per-account
  overrides, typed `receipt_required` rejection); digest; search; CSV/JSON
  export; period P&L and as-of balance sheet. End-to-end stdio protocol test
  green (initialize → 18 tools → draft → preview → receipt_required →
  attach → post → reports → digest → reverse).
- 22 tests green workspace-wide; `cargo fmt` clean; clippy clean except one
  pre-existing phase-1 style lint on a public engine signature.
- Docs: AGENTS.md (operating manual), requirements, architecture, oracle
  design, parity catalog (floor: 6 done), glossary, mcp-interface,
  receipt-store (journal design), capability-parity (10 of 12 rows covered).
  Plan: this file + roadmap.

**In progress:** nothing — the next arcs are queued below, unstarted.

## Next arcs (in order)

The project went AI-first on 2026-10-10 (Stephen's call): the primary
interface is MCP, not a cloned GUI. The first storage + MCP slice is done
(arcs 1–3 below). What remains:

1. ~~**`ledger-store`**~~ done — journal + blob store + SQLite projection.
2. ~~**Blob store**~~ done — folded into `ledger-store`.
3. ~~**`ledger-mcp`**~~ done — 18 tools, receipt policy, digest, export.
   Remaining from the spec: MCP *resources* (rmcp 3.x has no resource
   macros; hand-roll `list_resources`/`read_resource` next), Streamable HTTP
   transport, XLSX/IIF export formats.
4. **Capability parity** (`docs/capability-parity.md`): 10 of 12 rows
   covered; cash flow (engine R-FUTURE-3) and full CPA export (xlsx/iif)
   remain. Then the month-long parallel run against the GSheet; cutover per
   the cutover rule.
5. Then: oracle harness (GnuCash diff), read-only GUI on the event log,
   workflow parity.

## Decisions log

- 2026-10-10: Single currency per ledger for day one (R-5). Multi-currency
  is designed-for, not built.
- 2026-10-10: `Money` arithmetic is checked and returns `Result`; no
  panicking ops, no float paths anywhere.
- 2026-10-10: Negative zero is normalized away at `account_balance` — money
  never prints "-0". (Caught by the golden test on day one; the oracle works.)
- 2026-10-10: License MIT OR Apache-2.0, matching the storytold projects.
  GnuCash clean-room boundary documented in `docs/oracle.md`.
- 2026-10-10: AI-first pivot (Stephen). Primary interface is MCP
  (`docs/mcp-interface.md`), not a cloned GUI. Receipts/documents become a
  content-addressed blob store (`docs/receipt-store.md`). Parity target for
  the phase is the GSheet+GDrive system (`docs/capability-parity.md`), with
  a parallel-run cutover rule. GUI drops to read-only, event-log-driven,
  phase 4.
- 2026-10-10: Import/export targets QuickBooks formats (CSV, IIF, XLSX) —
  "could not give a single shit about GnuCash XML." GnuCash stays the
  *behavioral* oracle only. Receipt enforcement is server-side policy in the
  MCP layer (threshold + per-account overrides, typed `receipt_required`
  error, checklist in every preview); the engine stays policy-free.
- 2026-10-10: Storage durability (Stephen). SQLite is the query engine, not
  the source of truth: the source of truth is an append-only, hash-chained
  JSONL journal (fsync per append; tamper-evident; git-backup-friendly),
  SQLite is a disposable projection rebuilt from it, blobs stay
  content-addressed. Single write path: journal → fsync → apply to SQLite.