Fe’u penodir gan y Prif Weinidog i helpu Gweinidogion i ymateb i faterion pan fo gwaith y Llywodraeth a’r blaid sy’n llywodraethu yn gorgyffwrdd a phan na fyddai’n briodol i weision sifil parhaol gymryd rhan.
They are appointed by the First Minister to help Ministers on matters where the work of Government and the work of the Government Party overlap and where it would be inappropriate for permanent civil servants to become involved.