Harvester should enforce joi validation provided in the schema, and overriding/extending that validation.

[ssebro]

    var category = harvester
        .resource('categories', {
            name: Joi.string().required().description('a name'),
            links: {
                brand: 'brands'
            }
        });

    var validation = {
        get: {query: {myAwesomeParam: Joi.string().required().description('My awesome parameter')}}
    };
    //Overrides built-in joi validation of query.
    category.get().validate(validation.get).register();

[ssebro]

Note: the passed in validation object should be able to take query, body and header values.