AI apps work in demos, then production hits with drift, hallucinations, ignored instructions, and insane token costs. Willow is a runtime governance layer that sits between your app and LLM. By enforcing constraints at inference, Willow automatically steers conversations in real-time, so you don’t have to babysit outputs. Swap one line of code and get 82% fewer tokens, 75% faster multi-turn responses, and zero drift. Works with any model. No backend adjustments or added memory. Patent pending.