nothing wrong if your dsl stays small and you have deterministic validators/compilers to your actual target.

if dsl gets large, the number of potential interactions your dsl allow will grow exponentially (unless you are building an one dimensional action layer). and there will be semantic issues unless your dsl is "clear and intuitive", also comprehensive enough to accomodate your ongoing changes, else every change is now 2 changes.

so you now you need a comprehensive manual for your agent which needs to be sent in every /completion request.