[zem]

it would work better if the event was something like "PLAY, played=7, drawn=K, trashed=K, hand=[1,2,5]" with the client perhaps validating that applying the play does lead to the hand [1,2,5] as an error correction mechanism.

you need to make sure not to leak information about one player's hidden moves to another player, of course, but in general i would say have your events be as rich as possible so that clients can interpret them for animations, screen reading etc.

edit: for reference, this is the format scrabble programs have standardised on for their event log: https://www.poslfit.com/scrabble/gcg/