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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Per-model instruction snippet driven by remote config

Not switched on
Useful2 Signal4
System Prompt

Extra per-model guidance can be added to your session, but nothing supplies it here.

A model-keyed instruction snippet path exists but stays inert unless a server entry is populated.

What

A new path looks up a text snippet keyed by the model in use and, when one exists, applies it as extra session content, recording an event with its length and effort level. Nothing in this build supplies such a snippet locally, so it stays inert unless a server-side entry is populated.

Details
  • Read from remote config under tengu_brook_heron; a missing entry for the resolved model returns nothing and the session is unchanged.
  • The event tengu_brook_heron_applied fires only when a snippet was found.
Evidence

tengu_brook_heron

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.251 →