Claude Code

This example installs a pinned Claude Code release inside a Node.js microVM and opens it in a project mounted from your host. Claude Code can edit the checkout directly, while its installation, authentication, settings, and sessions stay on the sandbox’s root disk.

Run Claude Code

Start Claude Code

Replace ./my-project with the project directory you want Claude Code to work on:

msb run -t --name claude-code-demo --replace \
  --cpus 2 --memory 4G --root-disk 4G \
  --mount-dir ./my-project:/workspace:rw \
  --workdir /workspace \
  node:24-bookworm-slim -- sh -lc '
    apt-get update &&
    apt-get install -y --no-install-recommends ca-certificates git &&
    npm install -g @anthropic-ai/claude-code@2.1.235 &&
    exec claude
  '

msb run -t --name claude-code-demo --replace `
  --cpus 2 --memory 4G --root-disk 4G `
  --mount-dir ./my-project:/workspace:rw `
  --workdir /workspace `
  node:24-bookworm-slim -- sh -lc '
    apt-get update &&
    apt-get install -y --no-install-recommends ca-certificates git &&
    npm install -g @anthropic-ai/claude-code@2.1.235 &&
    exec claude
  '

Choose a terminal theme, then follow the sign-in prompts. If Claude Code cannot open a browser from the microVM, copy the displayed login URL and open it in a browser on your host.Anthropic recommends its standalone installer for normal host installations. This example uses the pinned npm package for a reproducible sandbox setup; the package installs the same platform-native Claude Code binary.

For an isolated workspace, or when using microsandbox cloud, replace --mount-dir ./my-project:/workspace:rw with --copy-dir ./my-project:/workspace.

Start another session

After leaving Claude Code, return to the same sandbox and workspace with:

msb exec -t claude-code-demo -- claude

The sandbox root disk retains Claude Code’s authentication, configuration, and conversation state between sessions.

Verify the installation

Exit the TUI and run:

msb exec claude-code-demo -- claude --version

The pinned example prints 2.1.235 (Claude Code).

Review or export changes

With the default writable mount, changes are already in the host checkout. Review them inside the sandbox:

msb exec claude-code-demo -- sh -lc 'cd /workspace && git status --short && git diff --stat && git diff'

If you chose the isolated --copy-dir alternative, create a patch inside the sandbox:

msb exec claude-code-demo -- sh -lc 'cd /workspace && git add -N . && git diff --binary > /tmp/claude-code.patch'

Copy the patch to the host:

msb cp claude-code-demo:/tmp/claude-code.patch ./claude-code.patch

Check that it applies cleanly before applying it:

git apply --check ./claude-code.patch

Clean up

Remove the sandbox:

msb rm -f claude-code-demo

Removing the sandbox also removes its Claude Code credentials, settings, and sessions. Changes made through the default workspace mount remain in the host checkout.

Agents

CI/CD

Docker

Sandbox Workflows

Automation & Tooling

Data & Observability

Run Claude Code

Reference

​Run Claude Code

​Reference

Run Claude Code

Reference