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Agent Lightning v1.0: A 3,500-Line Lightweight Agentic RL Framework for Training Agents with Real Harnesses

Agent Lightning is a lightweight framework that plugs existing agents into reinforcement learning pipelines. The 3,500‑line library lets developers train agents with real-world harnesses without rebuilding core logic, streamlining experimentation and deployment. It targets AI developers seeking faster RL integration and reduced boilerplate.

Microsoft Research·Oct 7, 2026

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