tengu_cobalt_plinth_larch
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.236, including the newest one read.
You could start a private artifact from a published template, but two server switches keep it shut here.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.236.
In the changelogs
5Releases whose published page names tengu_cobalt_plinth_larch.
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v2.1.267
Artifact feature: env var and gate renamed (artifact DB -> artifact type catalog)
The artifact type catalog's override variable and internal flag were renamed
gate cited by this entry, found in this entry's text
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v2.1.267
Artifact hot-update flag renamed / decoupled from artifact-types flag
Artifact hot-reload now has its own dedicated env var and gate, separate from the artifact-types feature
gate cited by this entry, found in this entry's text
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v2.1.265
Artifact reads gain awareness of cross-organization sharing and a type-contract paging parameter
Artifact reads now flag cross-organization sharing and add a paging parameter for type info
gate cited by this entry
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v2.1.242
Starting an Artifact from a type in a cloud session, behind a second gate that is off
Creating an artifact from a type inside a cloud session sits behind a second switch, off.
gate cited by this entry, found in this entry's text
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v2.1.236
Artifact types (templates and starters), built end to end and off by default
You could start a private artifact from a published template, but two server switches keep it shut here.
gate cited by this entry, found in this entry's text
Gate readings
4| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.267 | Off in both readings | off | off | not a boolean we can read |
| v2.1.265 | Not enough to say | no value returned | off | off |
| v2.1.242 | Off in both readings | off | off | not a boolean we can read |
| v2.1.236 | Off in both readings | off | off | off |
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.
Flag server, over time
15| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| this account | on | 2026-10-22T00:10:04Z | 2026-10-22T06:25:04Z | v2.1.307 to v2.1.308 |
| anonymous | off | 2026-10-17T05:30:04Z | 2026-10-22T06:25:04Z | v2.1.302 to v2.1.308 |
| this account | off | 2026-10-21T21:10:07Z | 2026-10-21T23:05:05Z | v2.1.306 to v2.1.307 |
| this account | on | 2026-10-21T21:09:42Z | 2026-10-21T21:09:42Z | v2.1.307 |
| this account | off | 2026-09-10T21:47:12Z | 2026-10-21T20:45:05Z | v2.1.268 to v2.1.306 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | off | 2026-08-19T04:25:04Z | 2026-10-17T05:10:04Z | v2.1.233 to v2.1.302 |
| 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 | 2026-08-18T07:25:04Z | 2026-09-06T01:55:04Z | v2.1.233 to v2.1.261 |
| anonymous | no longer carried | 2026-08-19T04:20:14Z | 2026-08-19T04:20:14Z | v2.1.233 |
| anonymous | off | 2026-08-18T04:50:04Z | 2026-08-19T03:45:04Z | v2.1.233 |
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.
First cited
1The earliest release whose published evidence quoted tengu_cobalt_plinth_larch was v2.1.236, 19 Aug 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.
Presence across releases
3Build by build
62One 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.