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Mine is forced to always start with writing tests (unit, e2e, smoke), then the script (with eager/early fail modes). I have yet to see this approach to fail.

That's obviously a part of the broader picture Claude always runs inside bwrap sandbox, any work involving python/nodejs must happen in the dedicated devcontainer, standard operations are reused via Makefile, Ai can use dedicated account in the developed $thing for testing in live, hooks governing tool calling are brutal, but it works.

For me at least.