tengu_violin_mute
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.257 and was gone by v2.1.321.
Scaffolding to mute and unmute served tools has landed, with state labels and a periodic timer, but nothing calls it.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.257.
In the changelogs
8Releases whose published page names tengu_violin_mute.
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v2.1.281
Settings panel receives remote-tool-serving status
The /config settings panel is now told whether remote tool serving is on
gate cited by this entry
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v2.1.267
Plan-mode permission mode gated behind a classifier flag
Selecting plan mode now runs through a new classifier check
gate cited by this entry
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v2.1.265
Directory/file sync engine gains a distinct 'muted' state
Directory/file sync now has a distinct 'muted' state, separate from shutdown or another-writer conflicts
gate cited by this entry
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v2.1.265
'Emergency switch' wiring added to cloud file-sync push
Cloud file sync gains a live mute/recheck control tied to the tengu_violin_mute setting
gate cited by this entry, found in this entry's text
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v2.1.265
Directory/file sync can be remotely muted via an 'emergency switch'
Cloud session file sync can now be remotely paused by Anthropic via an 'emergency switch'
gate cited by this entry
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v2.1.259
Cloud plugin admission gated by new session-mute state
Cloud plugin admission checks a muted session state and stays disconnected while muted, reconnecting and flushing on unmute.
gate cited by this entry
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v2.1.259
Served-tools mute flag added (tengu_violin_mute)
An internal flag controls whether the local tool server runs in a muted state, toggling serving mute on the sender.
found in this entry's text, named in this entry, gate cited by this entry
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v2.1.257
A 'served tools' mute mechanism exists with no in-bundle caller
Scaffolding to mute and unmute served tools has landed, with state labels and a periodic timer, but nothing calls it.
found in this entry's text, gate cited by this entry
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.281 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.
Flag server, over time
4| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| anonymous | off | 2026-10-17T05:30:04Z | 2026-11-12T05:55:04Z | v2.1.302 to v2.1.322 |
| this account | off | 2026-09-30T19:15:05Z | 2026-11-12T05:55:04Z | v2.1.286 to v2.1.322 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | off | 2026-09-30T18:45:07Z | 2026-10-17T05:10:04Z | v2.1.285 to v2.1.302 |
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
1The earliest release whose published evidence quoted tengu_violin_mute was v2.1.259, 2 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.
Presence across releases
6Build by build
59One 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.