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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

Claude Code v2.1.239 ·

Artifacts can be marked as co-written

Artifacts can now be stamped as co-written with an optional title, with no switch you can flip.

Under the hood Notable Nothing to try yet Internal Changes
JSON All of v2.1.239
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
Internal ChangesKind: in v2.1.239,
What probably matters to youSection of the release

A co-written marker and title field exist in artifact metadata, stamped only by code and exposed nowhere.

What

Stored artifact metadata now carries a co-written marker and an optional title, read back alongside the existing mode, shared-live and probe-failure fields. It is stamped only when the code writing the artifact asks for it, and there is no user-facing switch.

Evidence

cowritten

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.239 →

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