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 v2.1.224 Home All releases olderv2.1.223 v2.1.225newer

Attention budget: state and telemetry land, nothing can trigger it

Not switched on
Useful2 Signal5
Context Management Notable

A per-session attention budget with up and down shortcuts is built but completely unreachable.

Budget levels, telemetry and chat:attentionUp/Down actions exist, but the keybinding and handler maps splice in empty objects.

What

Groundwork for a per-session attention budget, one of "w25", "w50", "w100", "w200" or "unlimited" and defaulting to "unlimited". A cycle handler emits tengu_attention_budget_cycle, a new attachment type carries the budget into and out of the transcript, and two new key actions "chat:attentionUp" and "chat:attentionDown" exist. None of it is reachable: the chat key bindings and handler map both splice in an empty object where those entries would go.

Details
  • The attachment renders nothing and its generator returns an empty list, so the budget never reaches the model.
  • The cycle callback also returns early behind two condition checks that this build does not resolve.
  • A preserveLiveBudget option is passed into session restore and ignored by the function receiving it.
Evidence

tengu_attention_budget_cycle, chat:attentionUp

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 v2.1.224 →