What they did
Youn runs an autonomous Claude Code agent every day on one Windows PC, with a CLAUDE.md, memory files and a separate auditor agent. The Korean edition of Youn's book sells on a Korean e-book platform that forwards books to partner bookstores once they have an ISBN. The agent's evening summary carried a reminder to request bookstore distribution when the ISBN arrived. On 12 October, before pressing anything, the agent opened the seller screens and read them without changing state.
How it went
The sales screen showed eight bookstores, all requested on 31 August: two on sale, one sent, five pending. The reminder had been checking a ledger field no code ever filled. The evening run now reads that screen daily, stores each store's status and first day on sale, and only flags rejections or stops. A second change reads the monthly bookstore sales table for every year from 2026 on, leaving out the platform's own column to avoid double counting. The two fixes came with 10 and 13 tests, and the auditor sent the first pass back.
Worth knowing
Resubmitting a book on this platform sends it back to waiting for approval, so acting on a stale reminder had a real cost. Bookstore sales only land in the table on the 10th of the month, and Youn did not yet know whether the figures are prices or payouts. Youn sells a book about this setup.