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Sweep 23 Oct 2026 · 21:48Z Build v2.1.310 529 read Stable v2.1.308 Latest v2.1.310 Next v2.1.310 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.310 ·

Some tool instructions gain an alternate wording that is off by default

A remote switch can now swap in alternate instruction text for some tools, and the existing text is used unless it is switched on remotely

Nothing to try yet In Development
JSON All of v2.1.310
Nothing to try yetTier: how much it should matter to you
1Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
System PromptArea: what it touches
In DevelopmentKind: in v2.1.310,
In DevelopmentSection of the release

Unclear Which tools are affected and what the alternate text says is not shown.

What

Each tool Claude Code can use comes with written instructions telling the model how to use it. A new remote switch now picks between two versions of that text in at least three places, one of them in a tool's own instructions.

The switch is off unless it is switched on remotely. With no setting from Anthropic's servers, the existing text is used.

Why

This lets Anthropic try alternate tool instructions for some accounts, so the model may be told to use those tools differently where it is switched on.

Read from
Feature flag
tengu_rustling_lantern 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 v2.1.310: 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 v2.1.310. 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 doubtWhich tools are affected and what the alternate text says is not shown.
The name it cites is new in this buildNew in this build: tengu_rustling_lantern

See this entry in the whole of v2.1.310 →

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