[BUG] Bash tool returns exit code 1 with no output on Git Bash (Windows) since v2.1.45

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?

Since updating to v2.1.45, the Bash tool fails silently on Git Bash for Windows.
Every command returns exit code 1 with no output. The same commands work fine when running Claude Code from PowerShell.

• Was working before auto-update to 2.1.45
• No changes made to system, Git Bash config, or PATH
• Issue started today (Feb 18, 2026) after auto-update

What Should Happen?

Commands should execute and return output, as they did in previous versions.

Error Messages/Logs

Error: Exit code 1

Steps to Reproduce

1. Open Git Bash on Windows
2. Run claude
3. Ask Claude to run any bash command (e.g., pwd, echo hello)
4. Tool returns exit code 1, no output

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.44

Claude Code Version

2.1.45

Platform

Other

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_