I've been exploring this pattern recently too. Giving current coding agents an existing conformance or test suite and telling them to keep writing code unto the

I've been exploring this pattern recently too. Giving current coding agents an existing conformance or test suite and telling them to keep writing code unto the tests pass is astonishingly effective. I've now got a JavaScript interpreter and a WebAssembly runtime written in Python, built by Claude Code for web run from my phone.