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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.221 ·

Async sandbox dependency checking

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

You'll notice Internal Changes
JSON All of v2.1.221
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
SandboxArea: what it touches
Internal ChangesKind: in v2.1.221,
Internal ChangesSection of the release
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.

See this entry in the whole of v2.1.221 →

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