tengu_violin_amati
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.239, including the newest one read.
Settings pushed from the control channel are checked before they can change plugin forwarding, and refusals are logged.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.239.
In the changelogs
7Releases whose published page names tengu_violin_amati.
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v2.1.302
Device hooks can now be shelved from the server even when account flags are on
Device hooks setup gains an extra check that can stop registration even when both account flags are on
gate cited by this entry, found in this entry's text
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v2.1.293
Device hooks setup now treats a switched-off account flag as normal
Registering device hooks now uses a different account check and stops quietly when a flag is off, instead of failing
gate cited by this entry
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v2.1.248
Forwarding plugins and hooks to remote sessions is gated, and now says why it is off
Forwarding your plugins and hooks into remote sessions stays off unless the server enables it.
gate cited by this entry, found in this entry's text
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v2.1.242
Cloud-supplied hook templates run as vetted python3 scripts
Cloud-supplied hook scripts run through a vetted python3 wrapper that rechecks their checksum.
gate cited by this entry, found in this entry's text
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v2.1.239
Settings pushed over the control channel are screened before touching plugin forwarding
Settings pushed from the control channel are checked before they can change plugin forwarding, and refusals are logged.
gate cited by this entry, found in this entry's text
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v2.1.239
Cloud sessions can be handed forwarded plugin settings
Cloud sessions can accept a pushed plugin configuration, but it stays off without server values.
gate cited by this entry, found in this entry's text
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v2.1.239
Device hook forwarding worker added, off behind two flags and a kill switch
Cloud sessions could register hooks that run on your device, blocked by two off flags.
gate cited by this entry, found in this entry's text
Gate readings
5| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.302 read on another version | Off by default, switched on for this account | on | on | off |
| v2.1.293 read on another version | Off by default, switched on for this account | on | on | off |
| v2.1.248 | Off in both readings | off | off | off |
| v2.1.242 | Off in both readings | off | off | not a boolean we can read |
| v2.1.239 | Off in both readings | off | off | 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.
Flag server, over time
12| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| anonymous | on | 2026-10-17T05:30:04Z | 2026-10-23T02:05:04Z | v2.1.302 to v2.1.309 |
| this account | on | 2026-09-22T17:25:08Z | 2026-10-23T02:05:04Z | v2.1.280 to v2.1.309 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | on | 2026-09-22T17:20:06Z | 2026-10-17T05:10:04Z | v2.1.280 to v2.1.302 |
| this account | off | 2026-09-10T21:47:12Z | 2026-09-22T17:20:06Z | v2.1.268 to v2.1.280 |
| anonymous | off | 2026-08-19T19:15:05Z | 2026-09-22T17:15:06Z | v2.1.233 to v2.1.280 |
| this account | no longer carried | 2026-09-10T21:46:45Z | 2026-09-10T21:46:45Z | v2.1.268 |
| this account | off | 2026-09-08T20:36:15Z | 2026-09-10T17:40:05Z | v2.1.263 to v2.1.267 |
| this account | no longer carried | 2026-09-08T20:34:58Z | 2026-09-08T20:34:58Z | v2.1.265 |
| this account | off | 2026-09-06T02:40:05Z | 2026-09-08T18:45:05Z | v2.1.261 to v2.1.263 |
| this account | no longer carried | 2026-09-06T02:36:19Z | 2026-09-06T02:36:19Z | v2.1.263 |
| this account | off | 2026-08-19T19:25:05Z | 2026-09-06T01:55:04Z | v2.1.233 to v2.1.261 |
One row per unbroken stretch of one reading, newest first, from snapshots taken every twenty-five minutes or so. No longer carried is not off: it means the flag server stopped returning the gate at all, which is what a retired experiment looks like. The version column is what was installed when the reading was taken, not what caused it.
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
1Build by build
60One 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.