You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Context ManagementArea: what it touches
ImprovementsKind: in v2.1.252,
ImprovementsSection of the release
New machinery (RTt, PTt, dEt, pEt, yjt) diffs the currently-announced set of CLAUDE.md/instruction files against what was last sent, emitting a smaller 'instructions' attachment describing only what changed plus a list of removed files, instead of re-sending the full instructions block every turn. Messages include lines like 'Instruction files were re-read ...; these differ from their earlier copies' and 'Instructions no longer present: ...'.
A companion 'prompt_snapshot' attachment type records the exact system prompt and tool descriptions sent, reused via Use()/BUn() so unchanged tool descriptions don't need to be recomputed or re-sent (recordedDescription passed into dA/oie).
Read from
Feature flag
tengu_carved_slateOff 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 v2.1.252: not a boolean we can read
Flag reading movedThe flag server now returns on for tengu_carved_slate, 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 movedThe flag server now returns nothing at all, having stopped carrying it for tengu_carved_slate, 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.
