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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 v2.1.251 ·

Per-operation flags for artifact comments, subscriptions and types

Artifact comment and subscription operations can each be switched on separately from the server.

Nothing to try yet In Development
JSON All of v2.1.251
Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
In DevelopmentKind: in v2.1.251,
What probably matters to youSection of the release

Artifact comment, subscription and type operations are mapped to two remote flags, off unless the server enables them.

What

Artifact operations covering comments, subscriptions, listing types and creating a type are now each mapped to one of two remote flags, tengu_cobalt_plinth_burnet and tengu_cobalt_plinth_mallow, so they can be turned on individually from the server.

Details
  • Beyond the flag, an operation also requires two further capability checks to pass.
  • Neither flag is set locally, so availability is decided server side.
Evidence

tengu_cobalt_plinth_burnet

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

Read from
Feature flag
tengu_cobalt_plinth_burnet 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 v2.1.251: not a boolean we can read

tengu_cobalt_plinth_mallow 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 v2.1.251: not a boolean we can read

Read once, for one account on one subscription tier, against v2.1.251. 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_burnet, 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.
Flag reading moved The flag server now returns off for tengu_cobalt_plinth_burnet, 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.
Flag reading moved The flag server now returns nothing at all, having stopped carrying it for tengu_cobalt_plinth_burnet, 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 →

See this entry in the whole of v2.1.251 →

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