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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.307 ·

Idle compaction can also act on keepalive caches, not only one-hour ones

Idle compaction now covers two cache types, one-hour and keepalive, each with its own setting, and its notice no longer says "after an hour idle"

Nothing to try yet Improvements
JSON All of v2.1.307
Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
CompactionArea: what it touches
ImprovementsKind: in v2.1.307,
ImprovementsSection of the release
What

Idle compaction now handles two kinds of prompt cache, where it used to check only one:

  • the one-hour cache
  • a keepalive cache, which is held open while you are away

Each kind has its own remotely controlled setting, and both are off unless switched on remotely. CLAUDE_CODE_IDLE_COMPACT_MIN_TOKENS still applies.

The notice now reads "Compacted using a summary written while you were away", without "after an hour idle".

Why

Idle compaction can now apply when the cache is held by a keepalive and not only when it lasts one hour, which is why the notice no longer mentions an hour.

Read from
Feature flag
tengu_sunny_locket 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 v2.1.307: 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 v2.1.307. 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 {"mode":"off"} for tengu_sunny_locket, 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 moved The flag server now returns {"mode":"compact"} for tengu_sunny_locket, 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 moved The flag server now returns {"mode":"off"} for tengu_sunny_locket, 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 →

See this entry in the whole of v2.1.307 →

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