Keep company books with terminal coding agents
The author has kept books for several Swedish companies using Claude Code and Codex, which read receipts, matched bank rows, posted entries and caught a VAT error before filing.
Done withClaude CodeCodex
- What they did
- Philip Eriksson, co-founder of Igdrasil, talked to Claude Code and Codex in the terminal. They had controlled access to the books through Igdrasil's CLI or MCP server. The agents read receipts, proposed accounts and VAT, matched bank rows and staged draft entries. He reviewed the drafts, set limits such as which voucher series to use, and approved posting. The agents then read the ledger back.
- How it went
- Over ten weeks, Claude Code posted about 1,570 entries, and Codex caught a VAT return reporting a revenue account in the wrong box. Agents sometimes claimed work was done when it wasn't, and posted before approval.
- Worth knowing
- Let the agent stage and approve posting yourself, test only in a practice company, and ask for a ledger reconciliation after each batch instead of trusting the agent's summary.
Try it yourself with Claude Code
Help me keep the books for [company name] in [country] for [period]. Read the receipts in [folder], match them to bank rows in [file], and prepare journal entries in [accounting software format]. Check VAT or sales tax figures for errors before any filing. Pause and show me the entries and any VAT issues before posting or submitting anything. You're done when I have a reconciled set of entries and a list of questions.
Source: igdrasil.se · Undated
Five of these in your inbox every morning
The best things people got an AI agent to do, each with the prompt to try it.
More like this
Turn tickets into merged pull requests
Pulls tasks from GitHub Issues or Linear, then runs Claude Code or Codex in isolated Kubernetes pods to carry each one through to a PR.
Fill forms and review tax filings with Codex computer use
Secondhand accounts of OpenAI staff using Codex computer use for forms and PDFs, including one tax filing review that caught an error worth thousands.
Screen research papers against criteria
Codex reads a folder of PDFs to find articles that disagree with an argument, screens about fifty papers for a systematic review, and cleans messy CSV or Excel files.
- Custom agent
Shop for umbrella insurance through your personal agent
Personal AI agents use Coverage Cat's Agent API/MCP to size umbrella coverage and compare carrier options with price ranges, backed by a licensed broker.
Find idle cloud charge in receipts and get refund
Muse reviewed a year of receipts, found an idle Google Cloud database costing $9.54 a month, and drafted a follow-up that got $114.14 waived.
- Custom agent
File insurance claims for overcharges
Tarun told an agent to file all the claims after finding overcharges and has received $200 back so far.