tengu_cobalt_plinth_mallow

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.282, including the newest one read.

Releases whose published page names tengu_cobalt_plinth_mallow.

1. v2.1.282 24 Sep 2026
   Artifacts written by other people get new warning wording, off by default

   Claude Code can now wrap artifacts it reads as a non-owner in their own warnings, behind two remote switches that default to off

   gate cited by this entry, found in this entry's text

2. v2.1.282 24 Sep 2026
   Full reads of shared artifacts beyond your own channel are built but switched off

   Claude Code can now let the model read other people's shared artifacts in full, but only when a server switch that is off by default is on

   gate cited by this entry

3. v2.1.282 24 Sep 2026
   Artifact reads now summarise files from other organizations and hold back unsafe text

   Files from another organization's artifacts now come back only as summaries, and files with terminal control bytes are saved to disk instead

   gate cited by this entry, found in this entry's text

4. v2.1.251 28 Aug 2026
   Per-operation flags for artifact comments, subscriptions and types

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

   gate cited by this entry, found in this entry's text

Release	Resolved	This account	Anonymous	Compiled default
v2.1.282 read on another version	Off in both readings	off	off	off
v2.1.251	Off in both readings	off	off	not a boolean we can read

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

Read as	Reading	From	Until	Version installed
this account	off	2026-09-10T21:47:12Z	2026-09-28T08:05:05Z	v2.1.268 to v2.1.283
anonymous	off	2026-08-28T02:30:05Z	2026-09-28T08:05:05Z	v2.1.246 to v2.1.283
this account	no longer carried	2026-09-10T21:46:45Z	2026-09-10T21:46:45Z	v2.1.268
this account	off	2026-09-08T20:36:15Z	2026-09-10T17:40:05Z	v2.1.263 to v2.1.267
this account	no longer carried	2026-09-08T20:34:58Z	2026-09-08T20:34:58Z	v2.1.265
this account	off	2026-09-06T02:40:05Z	2026-09-08T18:45:05Z	v2.1.261 to v2.1.263
this account	no longer carried	2026-09-06T02:36:19Z	2026-09-06T02:36:19Z	v2.1.263
this account	off	2026-08-28T02:55:04Z	2026-09-06T01:55:04Z	v2.1.246 to v2.1.261

One row per unbroken stretch of one reading, newest first, from snapshots taken every twenty-five minutes or so. No longer carried is not off: it means the flag server stopped returning the gate at all, which is what a retired experiment looks like. The version column is what was installed when the reading was taken, not what caused it.

The earliest release whose published evidence quoted tengu_cobalt_plinth_mallow was v2.1.282, 24 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.