DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
Thumbnail images count against the same total size budget as your published files.
What's wrong with this entry?
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thumbnailthumbnailDark
What
A publish can now include thumbnail and thumbnailDark images. Their sizes are subtracted from the same total size budget as the rest of the published files, so a large thumbnail leaves less room for everything else.
Details
Applied whenever the thumbnail or dark thumbnail is supplied; no flag involved.
Both images count against the one shared publish size cap.
Evidence
Xr(s.thumbnail) + Xr(s.thumbnailDark)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.