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
1
The earliest release whose published evidence quoted tengu_gleaming_cupcake was v2.1.275, 17 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.
v2.1.275 – v2.1.30124 builds17 Sep 2026 → 15 Oct 2026 ◆in the build
v2.1.302 – v2.1.3032 builds16 Oct 2026 → 18 Oct 2026 ○not in the build
v2.1.304 – v2.1.3096 builds19 Oct 2026 → 22 Oct 2026 ◆in the build
v2.1.3101 build23 Oct 2026 ○not in the build
v2.1.311 – v2.1.3198 builds26 Oct 2026 → 6 Nov 2026 ◆in the build
Build by build
41
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.
v2.1.31126 Oct 2026·addedverdict: added · default unknown
v2.1.31227 Oct 2026·presentverdict: present · default unknown
v2.1.31430 Oct 2026·presentverdict: present · default unknown
v2.1.31530 Oct 2026·presentverdict: present · default unknown
v2.1.31631 Oct 2026·presentverdict: present · default unknown
v2.1.3172 Nov 2026·presentverdict: present · default unknown
v2.1.3183 Nov 2026·presentverdict: present · default unknown
v2.1.3196 Nov 2026·presentverdict: present · default unknown
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.