tengu_gb_eval_authed_enable
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.212 and was gone by v2.1.227.
Feature-flag requests can now attach auth asynchronously, but that path stays off in this build.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.223.
In the changelogs
3Releases whose published page names tengu_gb_eval_authed_enable.
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v2.1.227
Feature-flag machinery rebuilt as a class with a real dispose path
Feature-flag handling now cleans up properly, restoring the original fetch when disposed.
gate cited by this entry, found in this entry's text
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v2.1.223
GrowthBook auth header resolution is now async and gated
Feature-flag requests can now attach auth asynchronously, but that path stays off in this build.
gate cited by this entry, found in this entry's text
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v2.1.212
GrowthBook Authenticated Feature Flag Fetch [Gradual Rollout]
gate cited by this entry, found in this entry's text
Gate readings
3| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.227 read on another version | Not enough to say | no value returned | no value returned | not a boolean we can read |
| v2.1.223 read on another version | Not enough to say | no value returned | no value returned | off |
| v2.1.212 read on another version | Not enough to say | no value returned | no value returned | 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.
First cited
1The earliest release whose published evidence quoted tengu_gb_eval_authed_enable was v2.1.227, 10 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
2Build by build
85One 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.