Cân eu penodi gan y Prif Weinidog i helpu Gweinidogion ar faterion lle ceir gorgyffwrdd rhwng gwaith y Llywodraeth a gwaith Plaid y Llywodraeth, lle byddai’n amhriodol i weision sifil parhaol ymwneud â gwaith o’r fath. Maent yn adnodd ychwanegol i’r Gweinidog, gan roi cymorth o safbwynt sydd â mwy o ymrwymiad ac ymwybyddiaeth wleidyddol nag y byddai ar gael i Weinidog gan y Gwasanaeth Sifil parhaol.
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. They are an additional resource for the Minister providing assistance from a standpoint that is more politically committed and politically aware than would be available to a Minister from the permanent Civil Service.