connection_errorTier 1 · 70% confidence

mcp-connection-error-error-executing-mcp-tool-not-connected-on-windows--3ac85096

agent: mcp

When does this happen?

IF Error executing MCP tool: Not connected on Windows when using npx with MCP servers

How others solved it

THEN Change the MCP server configuration to use 'cmd' as the command with args ['/c', 'npx', '-y', 'server-package']. Alternatively, install the package globally via 'npm install -g' and use the global command directly. This resolves the issue due to Windows policies blocking npx temporary execution.

{
  "command": "cmd",
  "args": ["/c", "npx", "-y", "@modelcontextprotocol/server-github"],
  "env": { "GITHUB_PERSONAL_ACCESS_TOKEN": "<YOUR_TOKEN>" }
}

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