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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 v2.1.257 ·

AskUserQuestion-style tool prompt gains a leanPrompt parameter

The AskUserQuestion prompt now receives a lean-prompt flag that can suppress a guidance snippet.

TierUnder the hoodhow much it should matter to you
Useful2my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaToolswhat it touches
KindInternal Changesin v2.1.257,
Under the hood No documentation found

The AskUserQuestion prompt now receives a lean-prompt flag that can suppress a guidance snippet.

The AskUserQuestion-style tool's prompt() now also receives a leanPrompt parameter alongside model. The condition for injecting the tengu_cinder_plover guidance snippet now checks both together, so a lean-prompt mode can suppress or alter that text independent of which model is selected.

Read from
Names in the bundleleanPrompt
Feature flag
tengu_cinder_plover 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 v2.1.257: no gate table built for this version

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 v2.1.257. It isn't a statement about your account. What a flag value here can and cannot tell you

See this entry in the whole of v2.1.257 →

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