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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.257 ·

Artifact tool restructured into action-based dispatch, behind a gated toolset switch

The artifact tool's flat verbs are mapped to a canonical action shape, with a gate deciding which toolset is active.

TierNothing to try yethow much it should matter to you
Useful3my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaArtifactswhat it touches
KindIn Developmentin v2.1.257,
Nothing to try yet No documentation found

The artifact tool's flat verbs are mapped to a canonical action shape, with a gate deciding which toolset is active.

A large rework maps flat artifact-tool actions, read_file, read_asset, describe_type, list_files, list_assets, list_types, upload_asset, delete_asset, and comments/data sub-actions, to and from a new canonical action shape via the xee, uct, ULe, and Kle helpers. A new iw() helper decides whether this new action-based toolset is active, tracked via tengu_cobalt_plinth_damson.

Read from
Feature flag
tengu_cobalt_plinth_damson Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.257: off

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.257. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns on for tengu_cobalt_plinth_damson, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: tengu_cobalt_plinth_damson

See this entry in the whole of v2.1.257 →

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