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Sweep 08 Oct 2026 · 18:53Z Build v2.1.295 516 read Stable v2.1.286 Latest v2.1.295 Next v2.1.295 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.290 ·

Prompt notes on token cost and Bash call cost, both off by default

Claude Code can tell the model the user pays per token and what a Bash call costs, but both notes fall back to off

Nothing to try yet In Development
JSON All of v2.1.290
Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
System RemindersArea: what it touches
In DevelopmentKind: in v2.1.290,
What probably matters to youSection of the release

Unclear Whether these notes actually reach the model, and where they are shown, is not settled.

What

Claude Code builds a set of background notes about the session for the model. Two new ones can be added, and they replace an earlier note about model calls:

  • Per-token cost: tells the model "The user pays per token for your turns, and wants the job done for what it needs and no more." It appears only when the remote setting tengu_wobbly_dahl is on.
  • Bash call cost: a longer explanation of what each Bash call costs. Bash is the tool the model uses to run shell commands. It appears only when the Bash tool is available and the remote setting tengu_velvet_moon is on.

Both settings fall back to off when the server sends nothing, so neither note appears unless switched on remotely. The flag server returned tengu_wobbly_dahl as off for this site's account and for an anonymous account, in a reading not taken under this release.

Why

These notes are meant to push the model to group work into fewer Bash calls and spend fewer tokens.

Read from
Feature flag
tengu_wobbly_dahl 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 v2.1.290: 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.

tengu_velvet_moon Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.290: 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 v2.1.290. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhether these notes actually reach the model, and where they are shown, is not settled.
The name it cites is new in this buildNew in this build: tengu_velvet_moon

See this entry in the whole of v2.1.290 →

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