tengu_russet_linnet
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.196 and was gone by v2.1.216.
Default false. When on, the Skill tool's prompt uses the shorter Invoke a skill. text in place of the default Execute a skill within the main conversation text. Setting CLAUDE_CODE_SKILL_DESC_REFRAME to true turns this on regardless of the flag.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.215 bundle, and it can be wrong.
In the changelogs
1Releases whose published page names tengu_russet_linnet.
-
v2.1.196
Skill Tool Description A/B Test
gate cited by this entry, found in this entry's text
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.196 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
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
2Build by build
102One 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.