What
Compaction is when Claude Code summarizes the earlier part of a long conversation to free up room. Idle compaction does this while your session sits unused. It now has its own setting, idleCompaction:
- It appears as "Idle compaction" in /config, near Auto-compact, defaults to true, and is shown only when certain checks pass. The panel also reads where the value was set to decide whether you set it yourself.
- It is listed with
precomputeCompactionEnabledamong the settings that are synced and shown as toggles. - After an idle compaction, Claude Code now says "Compacted while idle, before the prompt cache expired", or a one-hour version, followed by "turn off with "idleCompaction": false in settings.json".
- The feature still depends on the
tengu_sunny_locketflag andCLAUDE_CODE_IDLE_COMPACT_MIN_TOKENS, and a helper now reports whether the mode iscompactorcompact_on_return. Nothing has been read abouttengu_sunny_locketfor this release. - Nearby, new helpers hide synced skills whose plugin is turned off and point to the plugin or to /plugin.
Why
If you would rather Claude Code not summarize your conversation while you are away, you can now switch it off in /config or by setting "idleCompaction": false in settings.json.
tengu_sunny_locket Not enough to sayNothing 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 v2.1.302: 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.
Read once, for one account on one subscription tier, against v2.1.302. 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.
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.
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.
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.
Added an Idle compaction row to /config for turning idle compaction off or back on; the notices shown after an idle compaction now say how…