Conversation compaction results are now pre-computed and persisted to a .precompact.json sidecar file, enabling instant compact rehydration when a session restarts.
- Feature-gated by
tengu_amber_packet; not universally enabled yet - Pre-compact file is written to the session directory alongside the transcript
- At session start, if a valid
.precompact.jsonis found and passes age/model/token-drift checks, the compaction result is reused without re-running the LLM summary - Invalidation conditions: model changed, too old, transcript grew or shrank too much, boundary UUID missing
- Log messages:
"precomputed compact: rehydrated","precomputed compact: persisted","precomputed compact: rehydrate rejected (<reason>)"
File constant (search for ".precompact.json") and feature flag (search for tengu_amber_packet)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_amber_packet 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 v2.1.198: 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 v2.1.198. 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.
New in this build: tengu_amber_packet