Source Intelligence

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

Idle-session cache stop policy runs in shadow mode

Not switched on
Useful2 Signal4
Caching

Logic measuring how long you've been idle logs what a cache stop would do without doing it.

Idle cache-stop policy runs in shadow mode behind an off-by-default internal flag.

What

New logic tracks main-loop request timing, when you last typed, and any delegated or background work in order to compute how long a session has been idle, then logs what a cache stop would have done. It does not act on that decision in this build, and the whole thing is behind an internal flag that defaults off.

Details
  • Purely observational: the computed stop is recorded, never applied.
Evidence

tengu_cache_heartbeat_shadow

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 →