Choose a sandbox environment changedsandbox-environments
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106106mkdir -p ~/.claude && { [ -f ~/.claude.json ] || echo '{}' > ~/.claude.json; }
107107```
108108
109Once the settings file is in place, launch Claude Code with `npx` and pass `claude` as the command to wrap:
109Install the runtime globally, under a prefix outside every path you allow writes to:
110110
111111```bash theme={null}
112npx @anthropic-ai/sandbox-runtime claude
112npm install -g @anthropic-ai/sandbox-runtime
113113```
114114
115Claude Code starts inside the sandbox with the filesystem and network boundaries you configured. The same command works for sandboxing standalone MCP servers or other helper processes.
115Once the settings file is in place, launch Claude Code through the runtime from your project directory:
116
117```bash theme={null}
118srt claude
119```
120
121Claude Code starts inside the sandbox with the filesystem and network boundaries you configured. The same `srt` command works for sandboxing standalone MCP servers or other helper processes.
116122
117123### What the runtime blocks on its own
118124
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