spawn ENAMETOOLONG in Cowork on all chats (new, existing, empty) - Windows 10 Build 26100

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?

Every Cowork session fails immediately with spawn ENAMETOOLONG — affects new chats, existing chats, and brand-new empty chats. Error fires before any message content is sent.

Environment:

• Claude Desktop: 1.15962.1.0
• Claude Code CLI: 2.1.176 (C:\Users\CSCHORR\.local\bin\claude.exe)
• Windows 10 Build 26100
• PATH length: 1,771 characters

Steps to reproduce:

1. Open Claude Desktop on Windows 10 Build 26100
2. Open Cowork tab
3. Start any chat (new or existing, even empty)
4. Error fires immediately: spawn ENAMETOOLONG

Notes:
PATH length of 1,771 characters is above average and may be contributing to pushing the spawned command past Windows' ~8,191 character CreateProcess limit when combined with Cowork's system prompt and model string. This matches the pattern reported in #60669 where the issue was account-specific rather than machine-specific.

Related issue: #60669

What Should Happen?

just work

Error Messages/Logs

Try sending your message again. If it keeps happening, share feedback so we can investigate.

spawn ENAMETOOLONG
You can restart the conversation from an earlier message.

Steps to Reproduce

every cowork attempt

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.176 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_