swaits
d5b9e5cf99
An invoice is issued, not edited. Without `confirmed` the create tools now preview: the posting (with the accounts' codes, which the live chart may not hold yet), the number it will take, its due date, terms and early discount, warnings, and for an invoice the DRAFT copy of the PDF, handed over as a file. Nothing is written and no number is used up. With `confirmed` the invoice posts, takes the number the preview showed, and files the issued copy with itself in the same call: `receipt.attached` on its entry plus the link to the invoice, its SHA-256 in the event (A-1, A-7, B-40). The copy the customer received is therefore the copy in the books, and `books.document`'s re-created page can never be mistaken for it. The result also carries a `mailto` link for a human to send it; the books never send (A-4). A bill keeps what the plan says a bill is: the vendor's own invoice number, the vendor's invoice filed on its entry as its evidence, and, in books that have declared `documents_v2`, an account on every line, so no bill can land in General Expenses by default any more (A-9, A-10, A-13). A vendor number entered twice is refused unless the caller says why, and the reason is journaled with the second bill (B-40 item 4). Books that have not declared the feature keep recording bills exactly as before, so the owner's books keep working between units (D-39, 8.0.4). Terms are resolved in one place and in one order: the due date given, else the terms given, else the customer's or vendor's own default, else the books' `invoicing.default_terms`; a document given only a due date stores no terms, so an old-shape invoice is still written byte for byte as before (B-39, A-13). D-55: a party carries the owner's full contact block (phone, contact person, billing and shipping addresses, billing email). It rides the same `party.updated` event behind `documents_v2`, and an invoice's bill-to is snapshotted at issue with the billing address and billing email in place of the general ones when the party has them — `PartySnapshot::from_party` is the one place that rule lives, so a later edit cannot change what was sent, and the next invoice takes today's details. Tests: the wire tests are the new `crates/ledger-cli/tests/documents.rs` (preview writes nothing, the DRAFT copy, the issued copy's SHA-256 equals `books.get_receipt`'s, numbers run, a bill's file and terms, the duplicate refusal, the line-account rules, the terms fallback, the `party_id` alias and the ambiguity it refuses, the contact block's set and clear, and the bill-to at issue); `format_upgrade.rs` gains `documents_v2_refused_until_consent` and the cut-over test now refuses and then makes a document carrying a new field (8.0.6 item 3); the store tests are `the_contact_block_round_trips_and_replays` and `an_invoice_keeps_the_billing_details_it_was_issued_with`, and `books_written_under_older_rules_still_open` gains a hand-written contact-block event (8.0.6 item 1). Merge does not need the owner's go-ahead: the live books refuse a write that needs `documents_v2` until he gives it, and take every other write as before (8.0.6 item 6). No figure moved: S4 moves none.
wanderbooks
Canonical double-entry bookkeeping, rebuilt from scratch. The engine is verified against oracles, parity is tracked automatically, and the primary interface is AI-first: you talk to an agent, the agent drives the books through MCP. Self-hosted, no rent.
What it is
ledger-core— the semantics engine. Exact decimal money, five account types, balanced journal entries, immutable posted log with reversing entries, trial balance, P&L, balance sheet, the statement of cash flows (direct method, with the reconciliation and noncash schedules), fixed-asset register with straight-line depreciation.ledger-store— durable storage. The source of truth is an append-only, hash-chained JSONL journal; SQLite is a disposable projection rebuilt from it; receipts live in a content-addressed blob store. Drafts are durable, corrupt projections self-heal.ledger-mcp— the AI-first interface. 118 MCP tools, served by the books server (wanderbooks server) on the data root's local sockets and reached through the agents' bridge (wanderbooks mcp --book ID): draft → preview → post workflow, server-side receipt policy (>$25), anti-splitting detection, asset management, digest for human review, plus read-only resources for dashboards.ledger-import— QuickBooks interop. Import bank/credit-card CSVs and chart-of-accounts CSVs; export IIF journal entries (for QuickBooks Desktop) and XLSX reports.ledger-config— the company settings in a books dir'swanderbooks.toml.ledger-gui— the viewer: a read-only, live window on the books for owners and their accountant (egui). Answers first (cash, runway, profit, what needs attention), then every number drills down to its lines, its entry, the rendered receipt, and the journal history. Follows the journal live: a change the agent makes appears in milliseconds.--demoopens a realistic demo company.
Verification
This is the storytold way applied to accounting: agents verify against oracles, never ship what they haven't demonstrated.
- 190+ workspace tests: invariant tests encoding accounting law, golden-file report snapshots, property tests (proptest), end-to-end MCP tests through a real books server.
- Formal proofs of the accounting laws (
just prove,docs/verification.md). Kani model-checks the engine's arithmetic kernel exhaustively within bounds. Lean 4 proves that, after any sequence of commands, the trial balance balances, the accounting equation holds, posted entries are forever, closed periods stay frozen, and a close moves exactly the net income to equity. The first pass found three engine bugs that every test, fuzzer, and mutant had missed: negative amounts accepted, and two crashes on oversized amounts. It also caught a soundness bug in the model checker itself. - Mutation testing via cargo-mutants; fuzzing via cargo-fuzz (11.5M+ executions, zero crashes).
- GnuCash is a behavioral cross-check, never the authority and never a code source (clean room, MIT OR Apache-2.0). Accounting principles, proved, are the spec. Where any other program disagrees, we work out from principles who is right.
Status
Parity is 12 of 12 against the spreadsheet workflow it replaces
(docs/capability-parity.md). The parallel-run plan
(docs/parallel-run.md) is written; the Google Sheet stays the system of
record until a clean month and explicit cutover approval.
See plan/STATUS.md for where things stand and
plan/roadmap.md for where it's going.
Quickstart
cargo test # whole suite
cargo run -p ledger-gui -- --demo # the viewer, on a demo company
New books, one command (installs Rust and wanderbooks if needed, makes the
books' private folder, starts books called acme and lets Claude Code reach
them; nothing needs sudo):
curl -fsSL https://wanderbooks.ai/install.sh | sh -s -- acme
Already installed, three commands: wanderbooks setup, wanderbooks books create acme, wanderbooks connect claude --book acme (or connect codex).
Then talk to the agent; wanderbooks gui acme shows the books, and its
Books menu backs them up, restores, starts new books and closes them.
Developing
Every tool the recipes use (Rust, just, Kani, Lean, cargo-mutants,
cargo-fuzz, Node for deploys) is pinned in mise.toml:
mise install
just # lists the recipes: check, build, prove, demo, ...
Layout
crates/ledger-core/ # engine: money, accounts, journal, ledger, reports
crates/ledger-store/ # journal + SQLite projection + blob store
crates/ledger-mcp/ # MCP server: 118 tools, resources, handbook, receipt policy
crates/ledger-import/ # QBO CSV import, IIF/XLSX export
crates/ledger-config/ # wanderbooks.toml company settings
crates/ledger-cli/ # `wanderbooks`: the one executable (every mode)
crates/ledger-host/ # the host, the agents' bridge, the owner's commands
crates/ledger-package/ # The CPA package and the 1099 worksheet (server and viewer)
crates/ledger-gui/ # the viewer: read-only, live (egui)
docs/ # requirements, architecture, oracle, parity, glossary
plan/ # STATUS.md, roadmap.md
AGENTS.md # operating manual for agents working here
License
MIT OR Apache-2.0. See LICENSE-MIT and LICENSE-APACHE.