Most command-line agents fix mistakes by brute force—MiRL takes a smarter route.
This new RL framework pinpoints the 8 most common errors (covering 52% of failures) in Qwen3.5-4B and retrains the agent specifically at those “misbehavior” hotspots. The payoff: MiRL beats the heavyweight TMax-4B on Terminal-Bench Lite (51.8% vs 47.4%) using only 35% of its rollouts and 56% of the cost. Misbehaviors drop by up to 57% on unseen tasks, and gains are confirmed by two independent LLM judges.
MiRL shows we can cut compute, boost reliability, and actually see what’s being fixed—no more black-box fine-tuning marathons.
Get the full analysis here:
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