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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
Home / Reference / Settings keys

thumbnailDark

setting never mined JSON

A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

You can publish an artifact with your own light and dark thumbnail images.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.251.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 149on this box, as of v2.1.308
Written about v2.1.251 first named in a changelog, 28 Aug 2026

In the changelogs

3

Releases whose published page names thumbnailDark.

  1. v2.1.251
    Custom thumbnails when publishing an artifact

    You can publish an artifact with your own light and dark thumbnail images.

    named in this entry, found in this entry's text

  2. v2.1.251
    Published artifacts can carry thumbnail images

    Thumbnail images count against the same total size budget as your published files.

    named in this entry, found in this entry's text

  3. v2.1.251
    Artifact publishing can attach page thumbnails, switched off in this build

    Published pages could carry light and dark thumbnails, but the feature is off.

    found in this entry's text

First cited

1

The earliest release whose published evidence quoted thumbnailDark was v2.1.251, 28 Aug 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.25128 Aug 2026Xr(s.thumbnail) + Xr(s.thumbnailDark)

Presence across releases

0

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.

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