gistfile1.pl

use strict;
use warnings;

package Minimum;

use Validation::Class;

directive 'my_directive' => sub { die };

mixin 'my_mixin' => {
    my_directive => 1,
};

field 'my_field' => {
    mixin => 'my_mixin',
};

__PACKAGE__->new( my_field => 1 )->validate;

Hey Timo,

Custom directives can only be used as field directives, not as mixin directives, this is by-design but may need to be rethought. field my_field => { my_directive => 1 }; will work as expected.