ResearchResearch paperLarge Language Models1 source · Oct 20, 2026

MaD-RSI: Model-as-Data for Recursive Self-Improvement of Agent Harnesses

Recursive self-improvement (RSI) of agent harnesses has emerged as an effective approach to enhancing the capabilities of large language model (LLM) agents.

Key points

  • However, such optimization often creates a strong coupling between the learned harness and its target LLM, limiting generalization across models and requiring substantial computational resources to adapt to new LLMs. Moreover, existing RSI methods typically optimize a harness using feedback from a single model and evaluate its generalization to other models only after training.
  • In this paper, we introduce a new perspective that treats models as data and places the harness at the center of optimization.
  • Building on this perspective, we propose MaD-RSI, a framework that directly optimizes a shared harness across multiple heterogeneous LLMs by incorporating their diverse failure trajectories into the training process.
  • Furthermore, we introduce a new evaluation framework with two complementary metrics designed to assess the effectiveness of harness optimization across models.

Sources (1)

  • [1]MaD-RSI: Model-as-Data for Recursive Self-Improvement of Agent Harnesses
    arXiv (AI, ML, NLP, CV, robotics, multi-agent) · Oct 20, 01:41 PM
    Recursive self-improvement (RSI) of agent harnesses has emerged as an effective approach to enhancing the capabilities of large language model (LLM) agents.
    However, such optimization often creates a strong coupling between the learned harness and its target LLM, limiting generalization across models and requiring substantial computational resources to adapt to new LLMs. Moreover, existing RSI methods typically optimize a harness using feedback from a single model and evaluate its generalization to other models only after training.

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Before this

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  2. Oct 20, 2026Cache Engineering for Agents
  3. Oct 19, 2026VibeTraining-Bench: Data-Trainer-Harness Co-Design for Iterative System Improvement
  4. Oct 19, 2026HarnessPro: Recursive Harness Self-Improvement with Pareto Optimization for Performance-Cost Trade-offs
  5. Oct 19, 2026Where is Physical RSI capability from? An Observational Scaling Law of LLM-as-policy
  6. Oct 19, 2026AdaExploreBench: Benchmarking LLM Agents for Proactive Exploration and Test-time Adaptation in Evolving Environments

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