tengu_violin_soundpost

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.277 and was gone by v2.1.282.

Releases whose published page names tengu_violin_soundpost.

1. v2.1.284 28 Sep 2026
   Directory sync no longer waits on a remote switch before offering to sync a cloud session

   When a cloud session attaches, Claude Code now offers directory sync without first checking a remotely controlled switch that could hold it back

   gate cited by this entry

2. v2.1.284 28 Sep 2026
   Cloud folder sync now signs uploads from your device and can be switched off by Anthropic

   Folder sync for cloud sessions now signs uploads as the bound device, and stops with a message if this computer can't or Anthropic switches it off

   gate cited by this entry, found in this entry's text

3. v2.1.283 25 Sep 2026
   Directory sync keeps the .gitattributes files it relies on and explains git settings it can't follow

   Directory sync now keeps the committed .gitattributes files it read, and refuses with a fix-it message when a git setting changes attribute rules

   gate cited by this entry

4. v2.1.282 24 Sep 2026
   Attaching a local git folder to a cloud session with file sync is built but off

   Code to attach a local git checkout to a running cloud session and keep files in sync is built, behind a switch that is off by default

   gate cited by this entry, found in this entry's text

5. v2.1.282 24 Sep 2026
   Attaching to a cloud session can set up its connection sooner

   When attaching to a cloud session in serve mode, Claude Code can now prepare the connection while it reads the stream position, not afterwards

   gate cited by this entry

6. v2.1.277 18 Sep 2026
   New attach-sync safety check for directory sync (git worker), gated by tengu_violin_soundpost

   Directory sync gains a pre-attach safety check to verify a checkout can attach cleanly, behind a new gate

   found in this entry's text, named in this entry

7. v2.1.277 18 Sep 2026
   New "sync at attach" flow for cloud/dir-sync sessions, gated behind two flags plus a peer capability

   A new 'sync at attach' step can pull a peer's files in before directory sync starts, gated behind flags and a peer capability

   found in this entry's text, named in this entry

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.

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.

The earliest release whose published evidence quoted tengu_violin_soundpost was v2.1.277, 18 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.

One 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.