In many countries governments have made laws that bar themselves from creating money directly. Instead they have to go via a circuitous route involving the creation of bonds. This means that the government has to go into debt in order to create more money. The reason for this self imposed restriction seems obvious to me - it is a kind of advertising to prospective purchasers of government bonds. It says "don't worry about us devaluing your bonds through excessive money creation because we have written it in stone that we're never going to do that". If it wasn't for this assurance then government bonds would be harder to sell.
Whatever the reasoning - after many years being interested in this question I have never come across any official explanation. Surely somewhere there must be a record of how these restrictions came into existence. Where are these records?