Are you saying you've never had them fail at a task?

I wanted to refactor a bunch of tests in a TypeScript project the other day into a format similar to table driven tests that are common in Golang, but seemingly not so much in TypeScript. Vitest has specific syntax affordances for it, though

It utterly failed at the task. Tried many times with increasing specificity in my prompt, did one myself and used it as an example. I ended up giving up and just doing it manually