ReadOnlyAttribute

Tsvrc.Utils.ReadOnlyAttribute marks a serialized field as read-only in the Unity Inspector.

[ReadOnly]
public int computedAtRuntime;

It's a plain PropertyAttribute with no members and no behavior on its own: the actual effect comes from its paired ReadOnlyDrawer (in the Editor assembly), which disables the GUI control while drawing the field so it renders grayed out. This only stops accidental edits in the Inspector; it doesn't make the field read-only from code, and doesn't affect serialization. Use it to signal "this value is managed elsewhere," most commonly a field the codegen generator itself writes, where hand-editing it in the Inspector would just be overwritten on the next regeneration. WirePoolAttribute uses the same disable-while-drawing technique for the same reason.