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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

Cache invalidation bookkeeping now limited to Cowork and desktop

You'll notice
Useful2 Signal3
Caching not in their notes

Two cache bookkeeping steps no longer run in the terminal CLI at all.

CLAUDE_CODE_IS_COWORK
What

Two internal cache-state updates, one on cache reads and one on deletions, now return immediately unless CLAUDE_CODE_IS_COWORK is set or the entrypoint is claude-desktop. In the terminal CLI this work no longer runs at all.

Evidence

if (!xC()) return;

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 →