rlm-harness

Prime Agent is an open-source harness that uses recursive subagents and persistent computation to extend language models' long-horizon capabilities across coding and reasoning tasks, significantly improving performance on benchmarks like ARC-AGI-3.

Discusses the concept of agent harnesses as compositional generalizers for scaling generalization in models, referencing the RLM harness.

fast-rlm is an open-source Python tool that allows LLMs to operate within an RLM harness for recursive subagent calls, with features like spend limits and live log streaming.