Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.274 ·

Compaction can now keep a tail-announcement summary of key attachments across a compact boundary

Compaction can now carry forward a short summary of key attachments across the compaction boundary

TierNothing to try yethow much it should matter to you
Useful3my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaCompactionwhat it touches
KindIn Developmentin v2.1.274,
Nothing to try yet No documentation found

Compaction can now carry forward a short summary of key attachments across the compaction boundary

What

When a conversation is compacted (its history condensed to save space), Claude Code can now build a short 'kept tail' summary noting which key attachments, such as instructions, session context, coordinator context, context sections, and date attachments, were carried forward past the compaction point. This emits a compact_kept_tail_announcements telemetry event recording whether it was enabled, where it was placed, and which types were kept. If a related feature flag check fails, it bails out early and records enabled:false.

Why

This makes it possible to track, and eventually improve, how well important context survives compaction instead of silently being dropped or duplicated.

Read from
Names in the bundletengu_calm_noodle
Feature flag
tengu_calm_noodle 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 v2.1.274: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.274. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhether the `tengu_calm_noodle` gate is active for any account hasn't been read, so nothing can be said about whether this behavior runs…
The name it cites is new in this buildNew in this build: tengu_calm_noodle

See this entry in the whole of v2.1.274 →