> which is the standard for all of Google's public APIs
Far from that, unfortunately. A lot of Google public APIs predate AIPs and it's practically impossible to fix them and make them compliant. Possibly the worst offender is the Compute Engine API [1], which, to the best of my knowledge, is REST only (no gRPC), uses its own conventions related to page size / next page token, and, in general, is special in many ways. One of the ways it's special is its size: its definition in Google's own Discovery format [2] is a 6MB JSON.
It's an extremely difficult problem to standardize multiple APIs produced by multiple teams, and then keep the new changes compliant. Google did a great job, but it's still very far from the perfect state.
I worked on this for a couple years (have been much less active lately), surprised to see it on the front page of HN but happy to answer questions about it.
More context at [2].
[1]: https://aip.dev [2]: https://aep.dev/blog/history-of-aeps/
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