You make agent A decompile the code and describe the behavior of each function in a spec. Then agent B with no access to the internet or the original code implements it.

This is legally safe because the spec only described interfaces and had no copyrighted code from the original app. APIs are fair use under Google v Oracle and code that accidentally ends up the same falls under merger doctrine.

They can maybe try and get you on patents but that's easy to avoid by doing it in Europe. Trade secrets don't apply because you reverse engineered the code. The only thing left is good old section 1201.

Of course it's different in practice because these companies have huge legal teams and know where the corpo friendly or tech illiterate judges work. But that's a separate question from is it legal or not.

You have an automated pipeline, that includes decompilation. I highly doubt the courts will see the nuance that you apparently do.

The pipeline begins with decompilation. Maybe it doesn't save all that information, but it is part of the pipeline, and so, will be part of the consideration when discovery happens.

I'll take "Shit people on the orange site say" for $400 Alex.