swaitsandClaude Opus 5.5
535874e0f3
The P3 cutover review's open point 2: a state's LLC filing fee, booked to an organization-costs account (tax category organization_startup), read as "Cash paid to suppliers and employees". B-14 rule 5 sent a payment to class (g) only when every operating line's account was taxes_licenses, so the account, not the payee, decided. ASC 230-10-45-17, read in EY's guide that reproduces it (Statement of cash flows, July 2026, p. 43; the PDF re-fetched and its SHA-256 recorded in docs/spec/sources/fasb-asc.md), lists apart "(b) Cash payments to other suppliers and employees for other goods or services" and "(c) Cash payments to governments for taxes, duties, fines, and other fees or penalties". 45-25's classes name only income taxes (f) among the latter, so the rest are (g), other operating cash payments. A formation filing fee is rightly an organization cost (its account and tax line), and still a payment to a government: the payee is what 45-17(c) is about. So rule 5 now sends a payment's government part to (g): of an operating payment the structure classes (d), what went to a party with the government_agency or tax_agency role (the chain root's parties, so a reversal keeps its original's class) is (g), on any account; and, as before, a payment whose every operating line is on a taxes_licenses account is (g). Every party a government: the whole payment. A government and a supplier named together: the payment is split by their resolved shares (B-35), the government's part (g), the rest (d), since ASC 230-10-45-22 has "each separately identifiable source or each separately identifiable use" classed "on the basis of the nature of the underlying cash flows" (EY p. 44; quoted in fasb-asc.md; it names the three activities, read for 45-25's classes too as a CONVENTION). The government's part is the payment x its share / the whole, rounded half to even to the base currency's places, the rest exact, so the line still sums to the payment and a reversal mirrors it. Shares that don't resolve leave the whole payment (d). One naming no party is decided by its accounts. Receipts are untouched (a refund from a government stays (c)). No total changes, only which operating row a payment is in. Two limits, from the review of this change: a government selling goods or services (postage) is 45-17(b)'s supplier "for other goods or services", so the rule says, and the handbook tells the agent, to add such a payee as a vendor, never with the government_agency role (the books can't tell what a payment bought; the role says it). And payroll keeps its structure (CONVENTION): an entry with a line on the salary expense or a payroll payable control account, or on a pay tax category (salaries_wages, officer_compensation, employee_benefits, pension_profit_sharing), stays (d) whoever it names: withheld taxes remitted are the employees' pay, and the payables mix them with the employer's taxes, which a remittance can't tell apart. So a remittance to the IRS is (d) as it was before this change; the employer's payroll tax paid on its own expense account is a tax, (g). The first company's books have this case: their state filing fee moves from "Cash paid to suppliers and employees" to "Other operating cash payments" at every date once its entry names the state's agency with the government_agency role and its own entry is the one whose cash the statement lists (paid from the bank, or on a card that is a lender's credit, D-42, or by a member through the members' account while it is a financing account, B-14 rule 11, the way that fee was paid); charged to an operating-payable card, its cash leaves in the card payment, whose payee is the bank, and it stays with suppliers. STATUS says how to check both, and that the cutover goldens' cash-flow snapshots will differ on the two class lines only (totals the same), so the next cutover diff isn't read as a regression. Docs: rules.md B-14 rule 5 (the rule, its source quoted, the date and what it was before); fasb-asc.md (45-17(b) and (c) quoted exactly, with the guide's SHA-256); the handbook's entries section (name the agency as the party on a tax, fee, fine or penalty paid to a government; a shared payment named with both amounts; a government selling services added as a vendor; payroll remittances stay with pay; a fee on a card follows the card payment); fasb-asc.md also quotes 45-22 and 45-22A; bookspec example cash-flow.government-fees.toml (a filing fee and a lawyer on one organization-costs account, a license on taxes and licenses with no party, a penalty to a tax agency on the wrong account, paper from a supplier, an annual report paid through a registered agent, 37.00 the state's and 100.00 the agent's; every figure by hand) with a new `class.<a..g>` key in the cash_flow query (bookspec README; the runner checks every class the statement has is given); testing.md; STATUS. Tests: ledger-core tests/spec_cash_flow.rs `a_payment_to_a_government_is_other_operating` (the filing fee and a penalty to a tax agency (g); the same account paid to a lawyer, or with no payee, (d); its reversal next month keeps (g); a refund (c)), `a_government_payee_moves_a_fee_on_any_account` (a taxes_licenses license with no party (g); a payment shared half and half between a government and a printer split 50.00 (g) and 50.00 (d), the government alone all (g)), `a_shared_government_payment_splits_to_the_cent` (a third by percent of 100.01: 33.34 (g), 66.67 (d); amounts split as given; the reversal mirrors to the cent), `a_payroll_remittance_to_a_tax_agency_stays_pay` (withheld taxes remitted from a payable holding its payroll role, and pay on a salaries_wages account, stay (d) with the IRS named; the employer's tax on its own expense account is (g)), `a_government_selling_services_is_a_supplier` (postage to a vendor (d); given government_agency, (g): the limit the handbook guards); src cashflow.rs `tests` `a_government_part_rounds_half_to_even` and the proptest `a_government_part_sums_and_mirrors`; the bookspec example; from the P4 review, `a_reversal_takes_its_originals_payee` (a fee and its reversal next month land in one class, the chain's payee deciding: the books keep a chain's parties one, so reading the reversal's own parties is an equivalent mutant) and `a_shared_government_payment_a_member_paid_splits_both_ways` (a shared payment a member paid: each part with its own on_behalf; fails with the on-behalf part unsplit). docs/mcp-interface.md: books.cash_flow and the Roles paragraph say a government or tax agency payee makes a payment other operating, and a shared one two operating lines. Broken to confirm: without the payee check the five spec tests and the example fail; without the split for mixed payees the two shared-payment tests and the example (class.d -549.50) fail; without the payroll exclusion the payroll test fails; rounding toward zero fails both unit tests; without the tax-category route `operating_classes_follow_asc_230_10_45_25`, the second test and the example fail. The viewer's cash flow page, rendered on made-up books before and after: the fee moved from "Cash paid to suppliers and employees" to "Other operating cash payments", every total the same; and on made-up books with an annual report shared between the state and an agent: each part on its own class line, every total the same. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj
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. 64 MCP tools over stdio or Streamable HTTP: 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 stdio tests.
- 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-mcp -- --data-dir /tmp/books # MCP server over stdio
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: 119 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.