TestLens for Claude Code

net.bigfloppy.testlens/testlens

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

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

Install TestLens in Claude Code

run in your project directory

claude mcp add --transport http testlens https://testlens.bigfloppy.net/mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs