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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Loop keepalive is on by default

You'll notice
Useful4 Signal3
Loops Notable

Self-paced loops now keep going until the budget is spent instead of stopping early.

Feature flag
tengu_kairos_loop_keepalive Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.248: off

Read once, for one account on one subscription tier, against v2.1.248. It isn't a statement about your account. What a flag value here can and cannot tell you

/loop
What

Loops that let the model set its own pace now keep rescheduling by default. The gate tengu_kairos_loop_keepalive ships with a built-in default of on (it was off), and the per-schedule check that bailed out early has been removed, so a loop runs until the budget is spent rather than stopping at the gate.

Details
  • Rescheduling goes straight to the budget check, which ends the loop with "keepalive budget exhausted (model declined to reschedule twice) — ending loop".
  • CLAUDE_CODE_LOOP_KEEPALIVE overrides both the server value and the built-in default.
  • With no server value set, keepalive is live on this build.
Evidence

tengu_kairos_loop_keepalive

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 v2.1.248 →