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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.221 ·

Leaner Bash tool description behind the thrifty-sonic gate

A much shorter Bash tool description exists, but only when the thrifty-sonic gate is switched on.

Nothing to try yet Notable No documentation found In Development
JSON All of v2.1.221
Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Tool UseArea: what it touches
In DevelopmentKind: in v2.1.221,
What probably matters to youSection of the release

A leaner Bash tool description sits behind CLAUDE_CODE_THRIFTY_SONIC and auto mode, off by default.

What

A shortened Bash tool description replaces the long avoidance guidance when the thrifty-sonic gate is on.

Details
  • the "IMPORTANT: Avoid using this tool to run ... commands" block and the dedicated-tool table collapse to a single bullet
  • requires auto mode active plus the gate, which reads tengu_thrifty_sonic or CLAUDE_CODE_THRIFTY_SONIC
  • the gate falls back to false absent a remote value, so most builds still emit the long text
Evidence

Communication: Output text directly (NOT echo/printf)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Names in the bundleCLAUDE_CODE_THRIFTY_SONIC
Feature flag
tengu_thrifty_sonic Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

This account: on · anonymous baseline: on · compiled default in v2.1.221: 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 v2.1.221. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns on for tengu_thrifty_sonic, 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 moved The flag server now returns nothing at all, having stopped carrying it for tengu_thrifty_sonic, 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.

See this across every release →

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: CLAUDE_CODE_THRIFTY_SONIC

See this entry in the whole of v2.1.221 →

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