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The skydream command-line tool is separate from the desktop app. It works on local files and does not require a cloud account or a running editor. Public CLI downloads are not yet published; current qualification covers Linux x86-64. After obtaining the CLI for your platform, start with:
Use an explicit document folder when inspecting a local EPUB:
Inspection reports supported structure and unsupported content. Validation checks the supported Skydream profile; it is not a claim to support every EPUB feature. Some CLI write operations support a narrower document profile than the visual editor. A refused operation protects unsupported content. Do not work around that refusal by removing formatting or replacing the original file. The CLI is not a replacement for account setup, cloud recovery or the desktop installer’s bundled background service.