When Claude re-reads a file that hasn't changed since its last Read, the tool result returns a warning instead of the file content, saving tokens.
Feature-flagged via tengu_noreread_q7m_velvet (default: false)
- Returns: "Wasted call — file unchanged since your last Read. Refer to that earlier tool_result instead."
- Edit/Write results now append: "(file state is current in your context — no need to Read it back)"
- Tool descriptions add: "Do NOT re-read a file you just edited to verify"
Re-read prevention (gated by tengu_noreread_q7m_velvet, search for "Wasted call")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_noreread_q7m_velvet 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 v2.1.91: no gate table built for this version
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 v2.1.91. 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.