## Description The Bash tool fails on every invocation with an EINVAL error when trying to open its temp output file on Windows. ## Error ``` EINVAL: invalid argument, open 'C:\Users\janar\AppData\Local\Temp\claude\C--Users-janar-Claude-tmp\tasks\ .output' ``` ## Environment - Claude Code version: 2.1.53 - OS: Windows 11 Home 10.0.26200 - Shell: bash - Binary location: C:\Users\janar\.local\bin\claude.exe - Binary last modified: 2026-02-24 (today, likely auto-updated) ## Steps to Reprod

Bash tool fails with EINVAL on Windows (v2.1.53)

Status Fixed / completed

Reported on v2.1.53

Maintainer reply None cached

Workaround ✓ Mentioned in thread ↓

Activity 4 comments · opened Feb 25, 2026 · closed Feb 25, 2026

Description

The Bash tool fails on every invocation with an EINVAL error when trying to open its temp output file on Windows.

Error

EINVAL: invalid argument, open 'C:\Users\janar\AppData\Local\Temp\claude\C--Users-janar-Claude-tmp\tasks\<id>.output'

Environment

Claude Code version: 2.1.53
OS: Windows 11 Home 10.0.26200
Shell: bash
Binary location: C:\Users\janar\.local\bin\claude.exe
Binary last modified: 2026-02-24 (today, likely auto-updated)

Steps to Reproduce

Open Claude Code on Windows
Run any Bash command (e.g., echo hello)
Every command fails with the EINVAL error above

Attempted Fixes

Manually creating the temp directory - did not help
Restarting Claude Code - did not help

Notes

This started after the binary was updated today (2026-02-24). All other tools (Read, Write, Edit, Grep, Glob) work fine - only Bash is affected.

View original on GitHub ↗

4 Comments

github-actions[bot] · 6 months ago

Found 3 possible duplicate issues:

This issue will be automatically closed as a duplicate in 3 days.

If your issue is a duplicate, please close it and 👍 the existing issue instead
To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

rubrical-worker · 6 months ago

Work around:
Use /config then set Auto-update channel to stable

You may need to install an earlier version.

shawnm-anthropic · 6 months ago

Hi, thanks for reporting. We just released v2.1.55 which should fix this.

github-actions[bot] · 5 months ago

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.