tengu_ccr_stream_flush_on_first_delta

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.285, including the newest one read.

Releases whose published page names tengu_ccr_stream_flush_on_first_delta.

1. v2.1.285 29 Sep 2026
   Two new delivery options for remote sessions, flushing and read receipts

   Remote sessions gain server-controlled options to send streamed output on its first piece and to acknowledge messages only once read

   gate cited by this entry

Release	Resolved	This account	Anonymous	Compiled default
v2.1.285 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.

The earliest release whose published evidence quoted tengu_ccr_stream_flush_on_first_delta was v2.1.285, 29 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.