Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Session ThreadingArea: what it touches
In DevelopmentKind: in v2.1.280,
In DevelopmentSection of the release
What
Claude Code adds a large new set of internal functions that track, per conversation thread, whether "thinking" content (Claude's visible reasoning) was newly created versus carried over from earlier in the conversation. When the server reports a prefix_mismatch that invalidates thinking content Claude Code had already sent, this new logic either recreates the thread on its next request, or, if the drop happened very early after a thread was just recreated, falls back to sending the rest of the conversation without a thread id at all.
Why
This is meant to keep a conversation working smoothly when the server can no longer accept previously sent thinking content, by automatically recovering instead of leaving the conversation in a broken state.
Read from
Feature flag
tengu_wondrous_acornNot 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 v2.1.280: not a boolean we can read
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.
Flag reading movedThe flag server now returns {"enabled":true,"min_continues":3} for tengu_wondrous_acorn, 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.
Flag reading movedThe flag server now returns {"enabled":false} for tengu_wondrous_acorn, 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.
Flag reading movedThe flag server now returns {"enabled":true,"min_continues":3} for tengu_wondrous_acorn, 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.
