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"Write a protocol and GraphQL", god damn it escalates quickly.

Fortunately, there are intermediate steps.

Any suggestions for a good RPC library?

I have had a really good experience with https://connectrpc.com/ so far. Buf is doing some interesting things in this space https://buf.build/docs/ecosystem/

I've used twitchtv/twirp with success. I like it because it's simple and doesn't reinvent itself over and over again.