Hello,
since I currently have English literature on my nightstand, I'll stick to the language this time: another First!
Then I'm confusing something here. I made and signed the construction contract with the developer. With the architect, I have to establish the work(-contract?). No idea, I'm a layman, the planning is connected here.
For a graduate engineer, you come across as very naive; I actually don’t know such imprecise statements from people of your profession.
You have "only" one contract, namely the work contract; you concluded this with the contractor. What you mean, in my opinion, is the work planning – this is necessary prior to the execution planning, so that the architect knows where to draw which connections, sewage pipes, etc., in the work plan. The architect and the contractor have a cooperation; your contracting party is exclusively the contractor ... unless you agreed otherwise.
However exactly it may be – no work planning/execution plans yet and soon the earthworks in preparation for pouring the slab ... I would be horrified.
Or do you just want to test the quality of the forum users?
Rhenish greetings