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Because that's impossible. Any "robot" that can generate code must be trained on massive amounts of code, most of which is open source.

And how are you supposed to guarantee equivalent functionality by analyzing "README files, API docs, and type definitions"?

The joke is that you don’t.

It's described on the web page but it's by having 2 agents. One has access to the code and one doesn't.

Are they the same model?

Not that it matters, I just think the joke is more fun if they are different.

It depends. Although they always have entirely separate contexts.