Bottom line: The NCSC recommends sandboxing, safeguards and active oversight to limit the cyber risks posed by autonomously acting AI agents.
The UK’s National Cyber Security Centre (NCSC) has published a blog post recommending that organisations secure autonomous AI agents through safeguards, sandboxing and active monitoring. The goal is to unlock the benefits of agentic systems while containing unintended activity.
In its latest blog post, the NCSC addresses how to manage the cyber risks of agentic AI systems – that is, AI agents that can independently perform actions, make decisions and complete tasks without continuous human control. The authority names three key countermeasures: the use of safeguards, the technical isolation of such systems through sandboxing, and active, continuous oversight of their behaviour.
For CISOs, agentic AI shifts the risk surface: unlike classic, deterministically controlled software, autonomous agents can perform actions that developers did not explicitly intend. This particularly concerns access rights, system integrations and the execution of actions with real-world consequences, such as file or data access, API calls or interactions with other services. Without appropriate isolation and monitoring, the risk increases that an agent may trigger harmful or unwanted actions unintentionally or as a result of manipulation (e.g. prompt injection).
Sandboxing technically limits an agent’s scope of action to a controlled environment with restricted permissions, so that potential damage remains contained in the event of a failure. In this context, active oversight means continuously monitoring agent behaviour and decisions in order to detect deviations early and intervene, rather than relying solely on one-off upfront checks. For security leaders in organisations evaluating or already piloting the use of agentic AI, the post thus provides a basis for incorporating governance requirements, permission management and monitoring processes for such systems into risk assessments at an early stage.
Source: www.ncsc.gov.uk · Published 20 August 2026
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