Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Per-operation flags for artifact comments, subscriptions and types

Not switched on
Useful2 Signal4
Artifacts

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

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

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

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.

See this entry in the whole of v2.1.251 →