What is your argument against function calling as the standard API interface for AI decisions?

Function calling is a deeply antipattern interface for AI decisions. One very simple ask I always had was that for any function call you should get a calibrated probability for each option. Without that, the only way to control refusal thresholds, routing thresholds, or decision confidence is through begging in a system prompt. That is an insane interface for software engineers. Our three primitives, noul for boolean decisions, choice for structured selection like a switch statement on an enum, and score for sorting or thresholding, map directly to programming primitives. They are not new names for existing types. They are new concepts that give software engineers the ability to actually control and measure AI behavior programmatically.