TestLens for VS Code

net.bigfloppy.testlens/testlens

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

client:VS Code transport:streamable-http tools:2

Install TestLens in VS Code

.vscode/mcp.json

{
  "servers": {
    "testlens": {
      "type": "http",
      "url": "https://testlens.bigfloppy.net/mcp"
    }
  }
}

Requires agent mode. MCP: Open User Configuration puts the same block in every workspace. VS Code docs