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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.234

Resume reads the pre-compaction sidecar ahead of time

Not switched on
Useful2 Signal2
Sessions not in their notes

Resume can fetch pre-compaction state early to cut a wait, but the flag is off.

Early sidecar fetch on resume is gated behind tengu_hover_rest, off by default.

Feature flag
tengu_hover_rest Off in both readings

The 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 v2.1.234: on

Read once, for one account on one subscription tier, against v2.1.234. It isn't a statement about your account. What a flag value here can and cannot tell you

tengu_hover_rest
What

When resuming a session, the file holding pre-compaction state can now be fetched while the session is being resolved rather than when it is needed, removing a wait during rehydration. Gated off by default behind tengu_hover_rest.

Details
  • Reads precompact.json from the storage backend, falling back to disk, with an 8 MB size cap; results are held in a cache of at most 8 sessions.
  • Rehydration uses the pre-read copy when present instead of reading again.
  • Forked sessions skip the read-ahead.
Evidence

precompact.json

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.234 →