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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

Claude Code v2.1.221 ·

Clear error when the Windows sandbox runs from a mapped network drive

On Windows, launching from a mapped network drive now tells you that's the problem and names the drive.

You'll notice Bug Fixes
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
WindowsArea: what it touches
Bug FixesKind: in v2.1.221,
Bug FixesSection of the release
What

A sandbox failure caused by launching from a mapped network drive now explains itself and names the drive, instead of surfacing as a generic sandbox failure.

Details
  • triggered by sandbox exit code 16 together with a structured mapped_drive_cwd error from the sandbox runtime
  • fires a sandbox_exec telemetry event at the point windows_mapped_drive_cwd
  • Windows sandbox execution path only
Evidence

mapped drives don't exist for the sandbox account. Use a workspace on a local drive.

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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