Custom attribute is missing AttributeUsage attribute CS-W1070
Anti-pattern
Minor
The AttributeUsage attribute allows you to specify where your attribute can be used, whether it should be used for a class, struct, or some other entity. If you're defining your own attributes, consider using AttributeUsage.
Bad Practice
class MyCustomAttribute : Attribute
{
}
Recommended
[AttributeUsage(AttributeTargets.Class)] // Should be used ideally only for classes
class MyCustomAttribute : Attribute
{
}