[BUG] Windows - Write tool call incorrectly calls mkdir on Windows drive
Status Open
Reported on v2.1.170
Maintainer reply None cached
Activity 1 comment · opened Jul 25, 2026
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?
Write hello.txt prompt fails on Windows
What Should Happen?
mkdir should not be called on Windows drive directly.
Error Messages/Logs
● Write(hello.txt)
⎿ Error: EPERM: operation not permitted, mkdir 'I:\'
⎿ Loaded 2 skills from .claude\skillsSteps to Reproduce
- Mount a folder to drive I: in Windows 11.
- Open Powershell and go to drive root I:
- Open Claude Code v2.1.170 with 'CLAUDE_CODE_PERFORCE_MODE' to '1'
- Ensure environment is
Primary working directory: I:\
Platform: Windows 11 Enterprise (10.0.26200)
Shell: Bash (Unix shell syntax)
Git repository: No
Model: Claude Haiku 4.5 (us.anthropic-claude-haiku-4-5-20251001-v1:0)
Knowledge cutoff: February 2025- Enter prompt: Write hello.txt
Claude Model
Other
Is this a regression?
No, this never worked
Last Working Version
_No response_
Claude Code Version
2.1.170
Platform
Anthropic API
Operating System
Windows
Terminal/Shell
Windows Terminal
Additional Information
_No response_
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