A new experimental setting precomputeCompactionEnabled allows Claude to precompute the compaction summary in the background before it's actually needed, making context-window compaction faster when it triggers.
Setting infrastructure exists and is wired to the settings UI, but the setting toggle is only shown when the server flag tengu_sepia_moth is enabled. The actual precompute behavior also requires this flag. The setting description reads: "@internal Precompute the compaction summary in the background before it is needed. Only applies when auto-compact is on."
- Appears in the Experimental section of
/settingswhen enabled - Default value is
truewhen the flag is active - Emits a
tengu_precompute_compaction_setting_changedtelemetry event on change
Setting description (search for "Precompute the compaction summary in the background") and setting key (search for "precomputeCompactionEnabled")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_sepia_moth Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.179: 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 v2.1.179. It isn't a statement about your account. What a flag value here can and cannot tell you
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.
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.