Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
System PromptArea: what it touches
ImprovementsKind: in v2.1.251,
What probably matters to youSection of the release
What
Two mechanisms can inject extra instruction text chosen by matching the model name, one for batching behaviour and one as a secondary reminder, each sourced from CLAUDE_CODE_TOASTY_THIMBLE or CLAUDE_CODE_GENTLE_PARASOL or from a server-supplied map. Each applies once per conversation per model. Both existed before this release; the wiring around them has moved.
Details
Telemetry records when each is applied.
With neither the environment variable nor a server-supplied value set, nothing is injected.
Evidence
CLAUDE_CODE_TOASTY_THIMBLE
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
