LEGO-RL: Harness-Native Reinforcement Learning for Coding Agents: Reinforcement learning for coding agents increasingly relies on...

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LEGO-RL: Harness-Native Reinforcement Learning for Coding Agents: Reinforcement learning for coding agents increasingly relies on long-running agent harnesses to manage tool integration, repository contexts, and execution feedback. However, the native execution environments of these harnesses are inherently misaligned with policy-gradient training: environmental crashes and reward hacking corrupt outcome signals, while...