[BUG] Cowork downloads Linux ELF binary on Intel macOS — exit code 132 (SIGILL)

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?

Environment:

Mac Pro, Intel Xeon (x86_64)
macOS Sonoma
Claude Desktop (latest)
Claude Code VM: 2.1.165

Binary downloaded:
ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked,
interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0,
BuildID[sha1]=2eabd56b93310e766961206f003fc2e163ec5f86, not stripped
Expected: Mach-O 64-bit executable x86_64
Result: Cowork crashes immediately with exit code 132 (SIGILL) on every prompt.

Please note: use issue #48827 as reference.

What Should Happen?

Claude Cowork should work without any issues.

Error Messages/Logs

Steps to Reproduce

The error triggers on any Intel-based Mac after upgrading Claude to the latest version.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.165

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="643" height="214" alt="Image" src="https://github.com/user-attachments/assets/5b4c0070-8279-4b25-8fb5-d8720759b8d2" />