📖 TL;DR An MCP eval is a realistic task a model must complete using only your server's tools — not an assertion about one call. A test asks "did the call work? ".
Source: [Dev.to](https://dev.to/rupa_tiwari_dd308948d710f/what-is-an-mcp-eval-why-your-server-passes-every-test-and-still-fails-41gf)