This page contains common information about the property system of the API.
Some of the properties are built-in. It means that they are defined by the skymp server itself, not by scripts. You are able to use
mp.set with built-in properties just like with properties added by your code.
These properties can be modified by a script with
These properties can NOT be modified by a script with
neighbors ([0xff000000, 0xff000001, ...])