TestLens

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

Install

Remote server: your requests and data go to testlens.bigfloppy.net. Claude Code: claude mcp add --transport http testlens https://testlens.bigfloppy.net/mcp · Claude app: Settings → Connectors → Add custom connector.

What it can do

The tools this server listed when we connected to it, in its own words.

• testlens_mutate — Mutation-test Python code: submit the module code and unittest test cases; TestLens generates small mutants (flipped comparisons, swapped op
• testlens_health — Check the TestLens API is up. Takes no arguments.

KitScout test notes

Not tested by KitScout yet. When our harness runs it, pros, cons and the tasks we tried appear here, with the date and evidence.

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