Microsoft Agent Lightning v1.0: Making the Training Loop Bow to Production, Not the Other Way Around

On August 17, 2026, Microsoft Research released Agent Lightning v1.0, an open source reinforcement learning (RL) framework addressing a long-standing but rarely named pain point in agent development: the environment you train an agent in and the environment you actually deploy it in are often two entirely different things. This gap has a name — train-serve mismatch — and Agent Lightning v1.0's...