tengu_expressive_whistle_config

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.248, including the newest one read.

Releases whose published page names tengu_expressive_whistle_config.

1. v2.1.248 27 Aug 2026
   Stale-data refetch throttle becomes server-tunable, still off by default

   Refetch throttling after stale-data signals is now server-tunable but stays off without a server value.

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

No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.

The earliest release whose published evidence quoted tengu_expressive_whistle_config was v2.1.248, 27 Aug 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.