Claude Desktop co-work task fails: sandbox-helper exec format error for missing srt binary

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?

sandbox-helper: failed to start command: fork/exec
/usr/local/lib/node_modules_global/bin/srt: exec format error

This task didn't load properly
CLI output was not valid JSON. This may indicate an error during startup. Output: sandbox-helper: failed to start command: fork/exec /usr/local/lib/node_modules_global/bin/srt: exec format error a claude co-word

What Should Happen?

This task didn't load properly
CLI output was not valid JSON. This may indicate an error during startup. Output: sandbox-helper: failed to start command: fork/exec /usr/local/lib/node_modules_global/bin/srt: exec format error a claude co-word

Error Messages/Logs

This task didn't load properly
CLI output was not valid JSON. This may indicate an error during startup. Output: sandbox-helper: failed to start command: fork/exec /usr/local/lib/node_modules_global/bin/srt: exec format error a claude co-word

Steps to Reproduce

This task didn't load properly
CLI output was not valid JSON. This may indicate an error during startup. Output: sandbox-helper: failed to start command: fork/exec /usr/local/lib/node_modules_global/bin/srt: exec format error a claude co-word

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.1.3363 (ee4247) 2026-02-17T15:55:21.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_