Money Engine

Sep 2026 – Present · Personal project, built by directing Claude Code

Claude makes one run a day, calling Money Engine's 21 tools, which read and write SQLite ledgers. Every run ends with two lists: to check, and to pay or move.

Money Engine is my personal finance assistant. Claude runs it each day through an MCP server I built, and it keeps my ledgers, works out what's due, and keeps my studio's books apart from mine.

It started inside Tasque, my agent platform, with ledgers that begin in September 2026. In October I moved it into its own Python package, with its own database and tool server. I built it by directing Claude Code, and every commit is co-authored by Claude.

The server has 21 tools over a SQLite database, through SQLAlchemy, and 57 tests. Every tool answers in JSON.

The rules

Every run reads the same rules before it does anything:

  • Amounts come from the ledger. A run can only state an amount that the ledger holds or a tool returned.
  • Numbers stay masked. Account and card numbers never appear in full.
  • Claude doesn't touch the money. No run signs in to an account, pays a bill or moves money. It tells me what needs doing, and I do it.

What a run leaves me

Each run ends with two lists: what I need to check, and what I need to pay or move. Every line quotes its amount, account and due date from the ledger.

The code isn't public.