tengu_cobalt_plinth_sedge
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.216, including the newest one read.
Reading an artifact as a public non-member reader still refuses; the switch stays off in this build.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.225.
In the changelogs
6Releases whose published page names tengu_cobalt_plinth_sedge.
-
v2.1.275
New cross-organization warning label on Artifacts
Artifacts from another organization now get an explicit untrusted-content warning shown to the model
gate cited by this entry
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v2.1.274
Public (non-member) artifact reads now conditionally admitted
Public, non-member reads of artifact content are now gated and flagged separately from relay reads
named in this entry, gate cited by this entry
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v2.1.274
Artifacts tool result text now distinguishes fully-public artifacts from org-internal ones
Artifacts tool now warns more strongly when a fully public artifact was made outside your organization
named in this entry, gate cited by this entry
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v2.1.274
Public, outside-org artifact reads now explicitly gated and denied by default
Reading a public artifact from outside your organization is now blocked unless a person approved it
gate cited by this entry
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v2.1.274
Public artifacts from another org are now hard-blocked
Public artifacts belonging to a different organization are now completely blocked from being read or written
gate cited by this entry
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v2.1.225
Public-reader artifact gate moved to a wrapper and now keys on the asset token alone
Reading an artifact as a public non-member reader still refuses; the switch stays off in this build.
gate cited by this entry, found in this entry's text
Gate readings
3| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.275 read on another version | Off by default, switched on for this account | on | on | off |
| v2.1.274 read on another version | Off by default, switched on for this account | on | on | off |
| v2.1.225 read on another version | Off by default, switched on for this account | on | on | 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
12| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| anonymous | on | 2026-10-17T05:30:04Z | 2026-10-22T06:25:04Z | v2.1.302 to v2.1.308 |
| this account | on | 2026-10-07T18:00:12Z | 2026-10-22T06:25:04Z | v2.1.292 to v2.1.308 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | on | 2026-09-17T00:25:04Z | 2026-10-17T05:10:04Z | v2.1.274 to v2.1.302 |
| this account | off | 2026-10-07T17:59:34Z | 2026-10-07T17:59:34Z | v2.1.293 |
| this account | on | 2026-09-17T00:25:04Z | 2026-10-07T17:10:05Z | v2.1.274 to v2.1.292 |
| anonymous | off | 2026-09-16T23:35:05Z | 2026-09-17T00:15:04Z | v2.1.273 |
| this account | off | 2026-09-16T23:35:05Z | 2026-09-17T00:15:04Z | v2.1.273 |
| anonymous | on | 2026-09-16T23:32:48Z | 2026-09-16T23:32:48Z | v2.1.274 |
| this account | on | 2026-09-16T23:32:48Z | 2026-09-16T23:32:48Z | v2.1.274 |
| this account | off | 2026-09-16T17:45:04Z | 2026-09-16T22:45:04Z | v2.1.273 |
| anonymous | off | 2026-09-16T17:40:05Z | 2026-09-16T22:45:04Z | v2.1.273 |
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_sedge was v2.1.225, 7 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
1Build by build
81One 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.