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 v2.1.239 Home All releases olderv2.1.238 v2.1.240newer
Claude Code v2.1.239

Three feature gates renamed, three retired

You'll notice
Useful3 Signal3
Artifacts Notable

Artifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off.

Feature flag
tengu_scalable_quiche 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 v2.1.239: not a boolean we can read

tengu_cobalt_plinth_yarrow 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 v2.1.239: on

tengu_ochre_hollow 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 v2.1.239: not a boolean we can read

tengu_russet_plover 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 v2.1.239: on

tengu_cobalt_thistle 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 v2.1.239: not a boolean we can read

tengu_slate_quoin Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.239: on

tengu_artifact_hljs_highlight Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.239: not a boolean we can read

tengu_artifact_mermaid_diagrams Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.239: not a boolean we can read

tengu_cobalt_plinth_quince Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.239: not a boolean we can read

Read once, for one account on one subscription tier, against v2.1.239. It isn't a statement about your account. What a flag value here can and cannot tell you

What

Artifact syntax highlighting and mermaid diagram rendering are now always on, their gates deleted. Three other gates were renamed, and all three still default to false, so what they guard stays off unless the server says otherwise and any remote config keyed to the old names no longer applies.

Details
  • Renamed: tengu_scalable_quiche to tengu_cobalt_plinth_yarrow, tengu_ochre_hollow to tengu_russet_plover, tengu_cobalt_thistle to tengu_slate_quoin.
  • Deleted, all previously defaulting to true: tengu_artifact_hljs_highlight, tengu_artifact_mermaid_diagrams, tengu_cobalt_plinth_quince.
Evidence

tengu_cobalt_plinth_yarrow

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 →