What
A new note called claude_app_notice can be attached to what the model sees. It applies when your latest message came from the Claude iOS app, Android app, desktop app or website. Its text is "The user's latest message came from the Claude" followed by the app's name. It is added ahead of the workflow keyword notes and sits behind a feature check.
A related flag, tengu_rosy_llama, returned off from the flag server for this site's account and for the anonymous baseline. Those readings were not taken under this release.
Why
This gives the model a new piece of context, so it can know which Claude client you are typing on.
tengu_rosy_llama Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.319: off
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
Read once, for one account on one subscription tier, against v2.1.319. It isn't a statement about your account. What a flag value here can and cannot tell you
New in this build: tengu_rosy_llama