For a professional lawyer, drafting a contract that meets requirements is a basic skill.
Of course, this task does not need a lawyer to sit in front of a computer and type it out character by character. What era are we in now? It would be too exhausting to make contracts in the traditional way. Contract templates exist for a reason, and seasoned lawyers should learn to draw on the wisdom of their predecessors and then make precise modifications according to the specific circumstances.
In the Continent where Transylvania is located, the summoning contracts of the Star Realm also have a standard template.
As Triss said, any summoner in their right mind would choose those peaceful and friendly demigods for their summoning. Although summoners are divided into various factions, Stellar Summoners and Alien Summoners are notoriously dangerous. Hence, the contract templates used by these two professions naturally need to be thicker.