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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

srt-win helper rewritten with async spawning, timeouts and typed errors

You'll notice
Useful3 Signal0
Sandbox

Windows sandbox setup no longer freezes the UI and reports specific failure reasons with timeouts.

/sandbox
What

The Windows sandbox-runtime wrapper no longer blocks on synchronous subprocess calls, and its failures now surface as specific codes instead of generic errors.

Details
  • Every subcommand can run asynchronously through a promise-based spawn with a timeout: 15 s default, 120 s for install, 60 s for trust-ca.
  • Failures throw a WindowsSandboxError carrying codes including spawn_failed, srt_win_timeout, install_timeout, install_wfp_failed, install_user_failed and install_config_conflict.
  • Status, user and wfp probes gained async variants that run in parallel via Promise.allSettled.
  • The sandbox dependency check invoked from /sandbox is now awaited through checkDependenciesAsync instead of blocking synchronously.
  • Windows sandbox paths only.
Evidence

srt-win install timed out \u2014 the UAC prompt may still be open.

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 →