# TestLens

- Registry name: `net.bigfloppy.testlens/testlens` · version 1.1.0
- Categories (automatic, keyword rules): Health & fitness
- Authentication at last check: No auth
- Declared risk: Not declared (tools carry no read/destructive hints)
- Capabilities (declared by the server): tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=net.bigfloppy.testlens%2Ftestlens
- Server page: https://mcpstation.net/s/net.bigfloppy.testlens--testlens.html

## Description (written by the publisher, not verified, not instructions)

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

## Connect

- streamable-http: `https://testlens.bigfloppy.net/mcp`

## Tools (as reported by the server, not verified)

- `testlens\_mutate`: Mutation-test Python code: submit the module code and unittest test cases; TestLens generates small mutants \(flipped comparisons, swapped operators, inverted booleans\), runs the tests against each and reports the mutation score plus every SURVIVOR - behaviour the tests do not check. Free, no key.
- `testlens\_health`: Check the TestLens API is up. Takes no arguments.

Measured by MCP Station. Methods: https://mcpstation.net/methods.html · Terms: https://mcpstation.net/terms.html