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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.318 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.277 ·

Artifact thumbnail description rewritten as a sentence

The Artifact custom-thumbnail tool description was rewritten as its own sentence, with added path escaping

You'll notice Improvements
JSON All of v2.1.277
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Artifact PublishArea: what it touches
ImprovementsKind: in v2.1.277,
ImprovementsSection of the release
What

The tool description text explaining that sharing an Artifact can also upload a custom thumbnail image changed from a trailing clause tacked onto another sentence ("with a custom thumbnail X") to its own standalone sentence ("Also uploads a custom thumbnail, X."). Path values used with this feature are also now escaped and normalized.

Why

The added escaping and normalization of paths helps ensure thumbnail file paths are handled consistently and safely, regardless of how they were entered.

See this entry in the whole of v2.1.277 →

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