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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.221

Async sandbox dependency checking

You'll notice
Useful3 Signal0
Sandbox

Sandbox startup on Windows no longer blocks while checking dependencies, so it should feel snappier.

What

The sandbox runtime gained an asynchronous dependency probe used by Windows initialization.

Details
  • checkDependenciesAsync sits alongside the existing synchronous checkDependencies.
  • Windows initialization awaits the async provisioning and dependency probes rather than blocking.
  • Dependency cache invalidation now bumps a generation counter.
Evidence

checkDependenciesAsync

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.221 →