powershell-mcp

powershell-mcp

A Model Context Protocol server that gives AI agents real, non-intrusive access to Windows PowerShell.

Most tools that let an agent run Windows commands spawn a visible console window for every call — which steals focus and interrupts whatever you're typing. powershell-mcp runs everything in a hidden process (windowsHide: true / no CreateWindow), captures structured output, enforces hard timeouts, and exposes purpose-built tools for service and system management. Built for running unattended next to a human at the keyboard.

Why

• No popup windows. Commands run hidden; your foreground app keeps focus.
• Structured + safe. Every call returns { stdout, stderr, exit_code, duration, timed_out }. Hard timeout with tree-kill. Output is capped so a runaway command can't flood the context.
• Real Windows management. First-class tools for services and system info, not just a raw shell — handy for managing Windows servers and backup systems.
• Cross-shell. Prefers pwsh (PowerShell 7+) and falls back to powershell.exe; override with PWSH_MCP_EXE.

Tools

Tool	Description
run_powershell	Run any PowerShell script/command (hidden). { script, cwd?, timeoutMs? }
list_services	List services, optional filter wildcard.
get_service	Detailed status of one service by name.
control_service	start / stop / restart / status a service.
system_info	OS, CPU, memory, and per-drive disk summary.
ssh_exec	Run a command on a remote host over SSH, fully in-process (no ssh.exe, no WSL — works headless). { host, username, command, port?, privateKeyPath?, passphrase?, password?, timeoutMs? }
winrm_exec	Run a command on a remote Windows host via PowerShell Remoting (WinRM / Invoke-Command). No SSH server or agent needed on the target. { computerName, command, username?, password?, useSsl?, authentication?, timeoutMs? }
sftp_upload	Upload a local file to a remote host over SFTP, in-process (ssh2 — no scp.exe/WSL, headless). { localPath, remotePath, host, username, port?, privateKeyPath?, passphrase?, password?, timeoutMs? }
sftp_download	Download a remote file to this host over SFTP, in-process. Same params as sftp_upload.

See it work

Real calls, real output — headless, no console window, structured results:

# ssh_exec — run a command on a Linux box, in-process (no ssh.exe, no WSL)
> ssh_exec  host=192.168.0.5  username=isak  command="uptime; systemctl is-active app"
$ ssh isak@192.168.0.5  (exit=0, 818ms)
 2 days, 23:53,  load average: 0.00, 0.01, 0.04
active

# sftp_upload — deploy a file, in-process (no scp.exe)
> sftp_upload  localPath=C:\deploy\app.py  remotePath=/home/isak/app.py  host=192.168.0.5 ...
sftp upload: C:\deploy\app.py → isak@192.168.0.5:/home/isak/app.py
OK (9129 bytes, 714ms)

Remote operations

powershell-mcp manages more than the local box. Windows' own ssh.exe produces no capturable output when run from a windowless/background process, and shipping WSL to every server doesn't scale — so remote exec is built in:

• ssh_exec uses the pure-JS ssh2 client (no external binary), so it works headless and needs nothing on the target beyond an SSH server. Ideal for Linux hosts.
• winrm_exec uses native PowerShell Remoting, so a Windows fleet needs only WinRM enabled — no per-server install.

Install

npm install
npm run build

Then register it with your MCP host. For Claude Desktop, add to claude_desktop_config.json (see examples/):

{
  "mcpServers": {
    "powershell": { "command": "node", "args": ["C:\\path\\to\\powershell-mcp\\dist\\index.js"] }
  }
}

Develop

npm run dev        # run from source (tsx)
npm test           # unit + (where a shell is present) integration tests
npm run typecheck

CI runs build + tests on both windows-latest and ubuntu-latest.

Security notes

• control_service and many commands require the MCP host process to run with sufficient privileges.
• The server runs whatever script it's given — run it only in environments you trust, behind a host (like Claude) that you control. A future release will add an optional allow/deny policy and confirmation gating.

License

MIT © IMR Research & Development (UK)