Troubleshooting Guide

Issue: MCP startup failed with "connection closed" error

Symptoms:

• Mobb Vibe Shield (MCP) client fails to start with error: MCP startup failed: handshaking with MCP server failed: connection closed: initialize response

Resolution:

This is typically caused by corrupted npm cache files in the npx directory. To resolve:

1. Navigate to your npm cache directory:

   • On macOS/Linux: ~/.npm/_npx/

   • On Windows: %USERPROFILE%\.npm\_npx\

2. Delete all folders under the _npx directory

3. Retry the MCP client startup