It's Postel's Law, on steroids. Be liberal in what you accept (with LLMs, that means 'literally anything'), but strict in what you return (which in an LLM is still 'literally anything' but you can constrain that).
Beyond that, I can't help but think of the old thin vs. thick client debate, and I would argue that "software should just talk via APIs" is why, in the web space, everybody is blowing time and energy on building client/server architectures and SPAs instead of basic-ass full-stacks.
Beyond that, I can't help but think of the old thin vs. thick client debate, and I would argue that "software should just talk via APIs" is why, in the web space, everybody is blowing time and energy on building client/server architectures and SPAs instead of basic-ass full-stacks.