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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 ·

Auto mode bash-first prompt variant

Auto mode can be told to do file reads, searches and edits through Bash, but it's off by default.

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
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
Auto ModeArea: what it touches
In DevelopmentKind: in v2.1.221,
What probably matters to youSection of the release

A bash-first auto mode variant sits behind CLAUDE_CODE_THRIFTY_SONIC, defaulting off.

What

Auto mode can be told to route file reads, searches and edits through Bash instead of the dedicated tools, but the gate defaults to off.

Details
  • the auto-mode attachment carries bashFirst and steerOnly flags
  • bashFirst changes the injected reminder to prefer the Bash tool, and the exit reminder adds a line telling the model to resume using the dedicated tools
  • steerOnly produces a shortened exit message
  • gated on CLAUDE_CODE_THRIFTY_SONIC, otherwise the gate "tengu_thrifty_sonic" with fallback false, and requires the Bash and edit/search tools to be present
Evidence

Resume using the dedicated tools for file reads, searches, and edits.

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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