[BUG] /sandbox shows Linux dependencies (bubblewrap/socat/seccomp) on macOS instead of Seatbelt

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Running /sandbox in Claude Code CLI on macOS shows the Dependencies tab with Linux-specific packages (bubblewrap, socat, seccomp filter) marked as "installed" — even though none of them are actually installed. There is no way to enable or configure sandbox from this menu.

On macOS, sandbox should use the built-in Seatbelt framework (sandbox-exec) per the docs:

"macOS: Uses Seatbelt for sandbox enforcement" "On macOS, sandboxing works out of the box using the built-in Seatbelt framework."

What Should Happen?

/sandbox should detect macOS and show Seatbelt-based sandbox configuration with an option to enable/disable it — not Linux dependency checks.

Steps to Reproduce

1. Open Claude Code CLI on macOS
2. Run /sandbox
3. See "Dependencies" tab showing bubblewrap, socat, seccomp filter as "installed"
4. No Enable/Settings tab available

Error Messages/Logs

No error — the UI simply shows incorrect platform dependencies with no way to proceed.

Environment

• macOS: 26.3 (Darwin 25.3.0, arm64)
• Chip: Apple M3 Pro
• Terminal: Ghostty
• Claude Code: 2.1.71 (native install at ~/.local/bin/claude)
• Node.js: v22.22.0 (mise)
• Claude Desktop: v1.1.5368 (installed, not related to CLI)

Diagnostics

$ sandbox-exec -n no-network /usr/bin/true   → works
$ which bwrap                                 → not found
$ which socat                                 → not found
$ node -e 'console.log(process.platform)'     → darwin
$ uname -s                                    → Darwin

Is this a regression?

Yes — sandbox worked on v2.1.63 (Feb 28). Broke after updating to v2.1.70+ (Mar 6–8).

Last Working Version

2.1.63

Claude Code Version

2.1.71

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Ghostty / zsh