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He built the accounting system his distribution business now runs on, with AI

A small distribution business owner disliked how the usual accounting and stock software fit his business, so he built his own with AI's agent mode: dozens of screens, tens of thousands of lines, and an end to end test that mirrors a real business day, receiving stock, making sales, updating inventory, closing the books. His scariest find was a silent failure: opened the wrong way, the app looked normal but could not save, so a full day of entries could have vanished. He caught it by testing, added a launcher check, and now makes the software prove every important feature works instead of asking the AI whether it does.

How it works

  1. Start with a one file tool on the shop PC
  2. Grow it with AI agent mode into a full desktop app
  3. Give business rules first and make the AI explain them back
  4. Test in the real Windows setup
  5. Catch a silent save failure and add a guard
  6. Regression test for every bug found

Why it’s worth knowing

The rule he landed on is the record: never ask the agent if a feature works, make the software prove it.

Where it’s from

Summarized from a public post on reddit.com. See the original ↗

Upgraded prompt

A ready-to-use prompt for this idea, built from research on what makes AI agents do the job right: who the AI should be, the exact steps, and a check to make sure it was done the way you wanted.

1Who the AI should be
2The prompt, with the steps
3The check when it’s done
Upgraded prompts are coming soon.

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Every idea is a real post from someone who tried it, summarized in our words, with a link to the original. App names are swapped for plain words.