tengu_sunset_penguin_opus47
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.196 and was gone by v2.1.221.
What it is
Nobody has written a line about this one. It is not in any of Anthropic's reference tables and no changelog entry here carries a description of it. It is in the build, which is the whole of what this page can claim.
Presence across releases
| Releases | Reading | Declared type | Default |
|---|---|---|---|
| 2.1.245 – 2.1.250 5 releases | never mined | — | — |
| 2.1.221 – 2.1.243 22 releases | not in the build | — | — |
| 2.1.196 – 2.1.220 25 releases | in the build | — | string |
A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.
Gate readings
| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.196 read on another version | Not enough to say | no value returned | no value returned | not a boolean we can read |
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.
Changelog entries naming it
-
v2.1.196Fast Mode Model Scope Narrowed
gate cited by this entry
Documentation pages
None of Anthropic's documentation pages this site has a copy of carries this name.
Names beside it
Every feature flag in the inventory starting tengu_sunset_penguin, up to twelve of them.
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.