Building Better Environments for Autonomous Cyber Defence
It provides a consolidated resource of tradecraft and domain knowledge for researchers and practitioners building RL environments for autonomous cyber defence, addressing a gap in the literature.
The paper presents a framework for decomposing the interface between RL cyber environments and real systems, along with best-practice guidelines for developing and evaluating RL-based autonomous cyber defence environments, derived from a workshop with experts from academia, industry, and government.
In November 2025, the authors ran a workshop on the topic of what makes a good reinforcement learning (RL) environment for autonomous cyber defence (ACD). This paper details the knowledge shared by participants both during the workshop and shortly afterwards by contributing herein. The workshop participants come from academia, industry, and government, and have extensive hands-on experience designing and working with RL and cyber environments. While there is now a sizeable body of literature describing work in RL for ACD, there is nevertheless a great deal of tradecraft, domain knowledge, and common hazards which are not detailed comprehensively in a single resource. With a specific focus on building better environments to train and evaluate autonomous RL agents in network defence scenarios, including government and critical infrastructure networks, the contributions of this work are twofold: (1) a framework for decomposing the interface between RL cyber environments and real systems, and (2) guidelines on current best practice for RL-based ACD environment development and agent evaluation, based on the key findings from our workshop.