I use Upwork's official MCP server from Claude Code, and doceval, my open-source eval tool, ships an MCP server of its own. This is how MCP works underneath, and four things I learned along the way. Where I tested something, I say how.
Source: [Dev.to](https://dev.to/dave8172/building-and-using-mcp-servers-4-things-i-learned-4agj)