file.saveAs and document.save wrote a PDF-compatible .ai, but
document.export (and with it the CLI's run --export x.ai and convert
in.svg out.ai, and MCP's export) refused it as a format that can only be
opened, and --help didn't list it as writable.
The .ai encoder is now shared: save.rs's ai_params and encode_ai (a PDF
of every artboard with the PDF options, carrying the native document,
blank pages with pdfCompatible: false) serve Save As and the exports
alike. The .ai format is writable, so document.formats, --help and the
MCP export tool list it; an export leaves the document's own path alone.
Export As and Export for Screens keep leaving .ai to Save As.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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