tengu_fizzy_minsky
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.300 and was gone by v2.1.301.
In the desktop app and on claude.ai, a browser request with no extension connected can get a fixed setup reply instead of a model answer
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.300.
In the changelogs
2Releases whose published page names tengu_fizzy_minsky.
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v2.1.301
Browser setup prompt in the desktop and web apps now uses a new switch
The fixed browser setup reply in the desktop app and on claude.ai is now controlled by a newly named switch, so any earlier rollout starts over
gate cited by this entry
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v2.1.300
Desktop and web apps can reply with a browser setup prompt without calling the model
In the desktop app and on claude.ai, a browser request with no extension connected can get a fixed setup reply instead of a model answer
gate cited by this entry, found in this entry's text
Gate readings
2| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.301 read on another version | Not enough to say | no value returned | no value returned | not a boolean we can read |
| v2.1.300 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_fizzy_minsky was v2.1.300, 14 Oct 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
9One 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.