[BUG] BUG] Cowork still fails on macOS with "Sandbox dependencies not available" — bubblewrap check not fixed (re: #19996)

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?

CLI output was not valid JSON. This may indicate an error during startup. Output: Error: Sandbox dependencies are not available on this system. Required: ripgrep (rg), bubblewrap (bwrap), and socat.

What Should Happen?

Cowork should start normally on macOS using Seatbelt for sandboxing (as it does for Claude Code), instead of checking for Linux-only dependencies (bubblewrap, socat). The sandbox dependency check should detect the operating system and use the appropriate sandboxing tool for that platform.

Error Messages/Logs

CLI output was not valid JSON. This may indicate an error during startup. Output: Error: Sandbox dependencies are not available on this system. Required: ripgrep (rg), bubblewrap (bwrap), and socat.

Steps to Reproduce

Open Claude Desktop app on macOS (latest version)
Click the "Cowork" tab at the top of the app
Send any message or start any task
Error appears: "CLI output was not valid JSON. This may indicate an error during startup. Output: Error: Sandbox dependencies are not available on this system. Required: ripgrep (rg), bubblewrap (bwrap), and socat."

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.1.3189 (1b7b58) 2026-02-14T00:09:46.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_