Claude Code now only re-sends changed CLAUDE.md/instruction files instead of the whole block each turn, saving tokens.
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).
tengu_carved_slate 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 v2.1.252: not a boolean we can read
Read once, for one account on one subscription tier, against v2.1.252. 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.