SEAL: Synergistic Co-Evolution of Agents and Learning Environments

• URL: http://arxiv.org/abs/2605.24426v1
• Date: Sat, 23 May 2026 06:41:31 GMT
• Title: SEAL: Synergistic Co-Evolution of Agents and Learning Environments
• Abstract summary: Large Language Model (LLM) agents are increasingly improved through interaction.<n>Most self-evolution methods adapt either the policy or the learning environment in isolation.<n>We propose SEAL, a closed-loop co-evolution framework for interactive tool-use agents.
• Score: 11.720414165425256
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Large Language Model (LLM) agents are increasingly improved through interaction, yet most self-evolution methods adapt either the policy or the learning environment in isolation. We identify this structural gap as \emph{Agent-Environment Misalignment}: the agent's capability frontier changes during training, while the environment that provides supervision remains static or only weakly coupled to the agent's revealed failures. We propose SEAL, a closed-loop co-evolution framework for interactive tool-use agents. SEAL collects on-policy trajectories under executable verification, diagnoses failed rollouts into turn-level failure labels, and uses these diagnoses as a shared signal for both environment-side adaptation and model-side policy optimization. The environment evolves its training-time learning interface by exposing clearer tool affordance cues, constraint information, and recovery-oriented feedback, while the policy is updated with diagnosis-guided advantage reweighting. Extensive experiments across in-distribution and out-of-distribution multi-turn tool-use evaluations show that SEAL improves low-resource agent learning: with only 400 training samples, it yields +8.25 to +26.25 average-point gains across three backbones and exhibits positive out-of-distribution transfer. These results demonstrate the value of jointly adapting the learner and its training-time learning substrate for robust self-improving LLM agents.

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