Modesty aside, I think I’ve come up with the cutest possible description of remote procedure call interface of the the #Guix & #Nix build daemon:
https://codeberg.org/guix/guix/pulls/4495/commits/055d146e9fcfe712bdc16defee1d7704168ff5ab#L54
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And with that, client and server stub generation is ~20 lines each.
Think of all the external tools and IDLs like rpcgen, MiG, etc.