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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.271 ·

New gated cleanup for stale waterfall-style transcript entries: tengu_silly_waterfall

A gated fix can now remove stale leftover transcript entries when resuming a headless session

TierNothing to try yethow much it should matter to you
Useful2my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaHeadless Modewhat it touches
KindIn Developmentin v2.1.271,
Nothing to try yet

A gated fix can now remove stale leftover transcript entries when resuming a headless session

What

When resuming a print or headless (non-interactive) session, Claude Code now checks whether the message right after a resumed user message is itself followed only by system messages, using a new check. If so, that entry gets removed from the transcript, and the count of forwarded messages is adjusted to match.

This cleanup only happens when a setting called tengu_silly_waterfall is turned on for the account.

Why

This is meant to prevent stale or orphaned transcript entries from lingering after a session resumes, keeping the conversation history clean.

Read from
Feature flag
tengu_silly_waterfall 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 v2.1.271: off

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 v2.1.271. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns on for tengu_silly_waterfall, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

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 doubtNothing has been read yet about whether `tengu_silly_waterfall` is on for any account.
The name it cites is new in this buildNew in this build: tengu_silly_waterfall

See this entry in the whole of v2.1.271 →

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