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

Streaming deltas can no longer crowd out task lifecycle events

You'll notice
Useful3 Signal2
Streaming

Bursts of streaming output no longer push out task start and status events.

What

The task event queue caps at 1000 entries. When full it now throws away new streaming deltas outright rather than evicting an older event to make room, so task start, notification and status events survive a burst of streaming output. It also drops streaming deltas when the primary sink is off and nothing is listening.

Details
  • Eviction telemetry keys bookend_evicted and nonbookend_evicted are unchanged.
  • Unconditional in the queue; no flag.
Evidence

nonbookend_evicted

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 →