How to Set Up an MCP Server in Claude Code on Windows Add HTTP, SSE, and stdio MCP servers to Claude Code on Windows. The cmd /c npx wrapper, the three scopes, and the errors you hit if you skip the wrapper. TL;DR: Use claude mcp add for remote HTTP servers without modification. Wrap any stdio server running through npx with cmd /c . Without the wrapper, npx fails to spawn and the server appears in claude mcp list but never connects. Prerequisites Claude Code installed. Run claude --version . Node.js 18 or newer on PATH if you plan to run stdio servers via npx. A working terminal. Windows PowerShell, Windows Terminal, or Git Bash. WSL is not required.…