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A third-generation izakaya owner in rural Japan had Claude enter cash receipts into a ledger. Date errors were fixed by adding one line to a written rule sheet.
The owner of a small countryside izakaya began using Claude for shop work on 19 October. The first job was the financial ledger: Claude read cash-payment receipts and wrote them in. The dates came out in the wrong order because the AI had not been told to sort them. The owner wrote a plain-text rule sheet covering shop rules, work rules and things never to do, and has Claude read it before each task. The date fix was one added line: sort by date and insert new rows in the correct date position. Claude later entered the ledger into accounting software, but only the items it was sure of. It asked about receipts with no tax rate and items with no category, and each answer was added to the sheet. As the sheet grew, the owner split it into a common sheet plus one per task: accounting, social media posts (Instagram and Google Maps) and the daily recommended menu.
The owner reports that the dates were sorted correctly after the added line, and that Claude stopped asking questions it had already been answered. After about two weeks, the owner calls it a reliable partner. No time savings, costs or error rates are given. The owner leaves final tax decisions to a tax accountant.
Self-reported after about two weeks, with no figures on time saved, cost or accuracy. The plan used and the accounting software are not named on this page. Tax treatment stays with an accountant. A long rule sheet can make individual rules less likely to be followed, so keep each sheet short.
Paste into ChatGPT, Claude or another AI assistant and fill in the square brackets.
You are helping with bookkeeping at [type of business]. Read the rule sheet below before every task. Rules: [list shop rules, for example: sort the ledger by date, insert new rows in the correct date position, never guess a tax rate]. Task: read these cash receipts [paste or attach receipts] and write them into the ledger as rows with date, supplier, amount, tax rate and category. Enter only the items you are sure about. For anything unclear, such as a missing tax rate or an undecided category, list it separately with the reason and ask me. Do not guess. Show me the finished ledger and the question list for review before anything goes into the accounting software. Afterward, suggest one line to add to the rule sheet for each mistake I point out.
Source: note.com · Nov 4, 2026. Summarised in our own words; read the original for the full account.
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