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Block the dangerouslyDisableSandbox escape under bypass-permissions #50

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Block the dangerouslyDisableSandbox escape under bypass-permissions #50

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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -197,6 +197,8 @@ Claude Code has a native sandbox that provides filesystem and network isolation

Without `/sandbox`, deny rules only block Claude's built-in tools -- Bash commands bypass them. With `/sandbox` enabled, the same rules are enforced at the OS level (Seatbelt/bubblewrap), so Bash commands are also blocked. Use both.

**Hardening the escape hatch:** Under bypass-permissions mode, a Bash call blocked by the sandbox can be retried by the agent with `dangerouslyDisableSandbox: true`, and the harness honors that retry with no user prompt. The `sandbox.allowUnsandboxedCommands: false` setting (included in this `settings.json`) makes the harness refuse those retries -- the rejection surfaces back to the agent as "disabled by policy in this environment". The setting is dormant unless the sandbox is enabled (via `/sandbox` or `"enabled": true`), so it imposes no friction on devcontainer and droplet workflows that never run `/sandbox`.

For the design rationale behind sandboxing, see Anthropic's [engineering blog post](https://www.anthropic.com/engineering/claude-code-sandboxing). For the full configuration reference, see the [sandboxing docs](https://code.claude.com/docs/en/sandboxing).

#### Devcontainer
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3 changes: 3 additions & 0 deletions settings.json
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Expand Up @@ -46,6 +46,9 @@
"Read(~/Library/Application Support/**/solflare*/**)"
]
},
"sandbox": {
"allowUnsandboxedCommands": false
},
"hooks": {
"PreToolUse": [
{
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