It's not that you ask it to write 200 lines of code at once, and blindly trust it. It's more that you start to use the lib, ask it to generate one helper method

It's not that you ask it to write 200 lines of code at once, and blindly trust it. It's more that you start to use the lib, ask it to generate one helper method at the time, for an isolated task. Which leave you time to "review" the code that it wrote properly. Even when a human writes code, it needs to go through peer-review. So the exact same applies with AI. It's the job of the reviewer (in this case, the one who invokes the AI) to make sure that the one who wrote the code does not do mistake, which can include going to read the doc in more detail.