What it is
A helper that always returned false now checks a remote gate first.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.260.
Presence across releases
1Build by build
18One 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.
First cited
1The earliest release whose published evidence quoted tengu_ochre_bittern was v2.1.260, 3 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 above.
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.260 read on another version | 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
8| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| this account | off | 2026-09-10T21:47:12Z | 2026-09-23T08:55:05Z | v2.1.268 to v2.1.280 |
| anonymous | off | 2026-09-02T16:30:06Z | 2026-09-23T08:55:05Z | v2.1.258 to v2.1.280 |
| 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 | 2026-09-02T16:35:05Z | 2026-09-06T01:55:04Z | v2.1.258 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.
Names beside it
Every feature flag in the inventory starting tengu_ochre, up to twelve of them.
tengu_ochre_finchNo description from anybody. v2.1.138
tengu_ochre_gantryNo description from anybody. v2.1.203
tengu_ochre_hollowArtifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off. v2.1.138
tengu_ochre_kiteClaude Code now recovers gracefully when a safety filter cuts off a response mid-tool-call v2.1.273
tengu_ochre_ploverClaude can auto-draft replies to artifact comments, but it's off by default and declines by default. v2.1.260
tengu_ochre_wrenAn alternate opening line for Claude's system prompt can be switched on with an environment variable. v2.1.239
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.