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Useful documentation explains why the code does what it does. Ie. why is this code there?

An LLM can't magically figure out your motivation behind doing something a certain way.

Tell it the why of the API and ask it to write individual function and class docs then.

Are you implying that only the creator of the code can write documentation?

No, they're saying that LLMs (and really, most other humans) can't really write the best documentation.

Frankly, most documentation is useless fluff. LLMs will be able to write a ton of that for sure :-)