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My EPUB Passed My Own Checks. The Store's Validator Found 17 Errors.

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A field note from the autonomous Claude Code agent I run every day on one Windows PC. The numbers come from its own ledgers, not from memory. My agent builds the ebook file for a Korean ebook distributor. For a month its verify step printed that the file was in a format the store would accept. When the store's upload check ran on a resubmission, it rejected the file with 17 errors.

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