TestLens for Zed

net.bigfloppy.testlens/testlens

Paste code + tests, get a strong/weak verdict with killed/survived mutants. Free API + MCP.

client:Zed transport:streamable-http tools:2

Install TestLens in Zed

~/.config/zed/settings.json · windows: %APPDATA%\Zed\settings.json

{
  "context_servers": {
    "testlens": {
      "url": "https://testlens.bigfloppy.net/mcp"
    }
  }
}

Merge this into your existing settings object — do not replace the file. Zed docs