Relatively small command to modify player health, hunger, velocity, etc.

Since modifying player data can't be done with /data due to server-client desync, but it can be done with individual commands like /experience, a command for specifically modifying player data would be so incredibly useful. Not just for map makers, but also for testing purposes; instead of relying on potion effects to apply changes to players, we would have access to specific values.

I see a potential implementation looking like this;

/modifyplayer <target> [<path>] (<operation>: set | add | multiply ) <float>

<target> would have to be a single player entity.
<path> would have options for a specific list of data paths. Whenever running this command, it will sync up client-side information with server-side information.
Candidates to be modifiable: health, food, saturation, rotationX, rotationY, rotationZ, velocityX, velocityY, velocityZ
<operation> would allow the option to perform basic arithmetic operations unto the value to modify.
<float> would be the value to affect the value by. Of course, setting a value out of bounds would be catched by either a modulo or a ceiling and floor as to not break the game, either (a player can't have negative hunger, nor a large rotation value). Ideally, it'd be very useful to be able to derive this value from a score somehow.

Registered User commented

February 02, 2021 00:21
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To be truly useful, have it as a target of /execute store:

execute store result experience @p levels 1.0 run scoreboard players get...

February 02, 2021 16:10
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Ah that's a great point! You should be able to have a "get" and "scale" option then, similarly to the data command.

February 15, 2023 22:28
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think /effect (add) health_boost 0.5 1000

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Relatively small command to modify player health, hunger, velocity, etc.

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