[Windows_MCP_Bug_Report.Bug Report: Windows-MCP PowerShell Tool — Subprocess Hang
Date: 2026-03-25
Reporter: mkime (TOWERPC)
Claude Desktop Version: Claude 1.1.8629.0
OS: Windows 11, MSI B560M PRO-VDH WIFI (MS-7D18), AMD64
Extension: Windows-MCP (ant.dir.cursortouch.windows-mcp)
SUMMARY:
The Windows-MCP PowerShell tool hangs indefinitely (4+ minute timeout) when executing any command that spawns a child process. Simple built-in commands work fine. This makes the tool nearly unusable for real development work.
COMMANDS THAT WORK (respond instantly):

echo "text"
python --version
arduino-cli version
node --version

COMMANDS THAT HANG (4+ minute timeout, never return):

pip --version
pip list
npm --version
python -m pip --version
python -c "import sys; print(sys.executable)"
Any script block with loops, Write-Host, or multiple commandsmd](https://github.com/user-attachments/files/26243236/Windows_MCP_Bug_Report.md)