Ledger

A local stdio MCP server that gives an assistant exact-decimal double-entry bookkeeping tools so money math and ledger posting happen in code, not in tokens.

What you can do

Compute exact-decimal money arithmetic: add, subtract, multiply, divide, allocate, convert and compare amounts, and look up IFRS/GAAP citations from a graph. Validate and post journal entries, including guarded posting against locked periods, and create hard-close period locks. Read balances for one account or a trial balance across all accounts, verify the accounting equation, and generate closing entries and cash-flow statements. Produce audit hashes, verify determinism, replay runs with checkpoints, and build proof bundles. Handle FX translation with CTA, depreciation schedules, position reconciliation, FIFO/LIFO/HIFO lot relief and trade-date versus T+N settlement entries.

When to use it

Use it when an assistant needs to do bookkeeping or financial arithmetic where rounding errors and token-based math are unacceptable, such as posting entries, checking balances, closing periods or auditing a ledger. It suits deterministic, reproducible accounting workflows rather than general financial advice.

Requirements

Runs as a local process over stdio, started with npx from the npm package, so Node.js and network access for the package download are needed. No authentication, environment variables or headers are declared. Ledger data is passed in and out as JSON.