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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
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Claude Code v2.1.300 ·

New --unsandboxed flag and a sandbox-VM-by-default decision at session start

Session start can now place a session in a sandbox VM by default, and a new --unsandboxed flag opts out of that and of cloud-by-default

Group of 2 Use it now Notable New Features
JSON All of v2.1.300
Use it nowTier: how much it should matter to you
5Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
SandboxArea: what it touches
New FeaturesKind: in v2.1.300,
What probably matters to youSection of the release

Unclear It is unclear whether --unsandboxed is a flag users can pass or only an internal entry, and what it does.

What

When a session starts, Claude Code now makes a second decision alongside the existing one about running in the cloud by default. The new decision is about a sandbox VM, an isolated virtual computer the session runs in, kept separate from your own machine. The decision ends as none, declined or applied. It applies when:

  • the sandboxVmByDefault option is set,
  • the session is eligible, and
  • you did not pass unsandboxed.

Related changes:

  • --unsandboxed is a new command-line flag Claude Code recognises. It is added to a list of flag names that also holds --remote-control, --rc and --local. What that list is used for was not traced.
  • The cloud-sessions-by-default decision now also counts unsandboxed as declining it, the same as --local. Before, only local declined it.

Why

Where these defaults are switched on, a session may start in a sandbox VM or in the cloud without you asking. Passing --unsandboxed is the way to stay out of both.

What the documentation says
--remote-control Choose a permission mode modified, low confidence * Before v2.1.202, sessions connected with `/remote-control` or `claude --remote-control` didn't report their permission mode at all, so claude.ai and the mobile app could show a permission mode the session wasn't in. The mismatch affected… see the edit
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 doubtIt is unclear whether `--unsandboxed` is a flag users can pass or only an internal entry, and what it does.

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