An AI agent is a machine identity that chooses its own next action. These pages cover the access that makes that possible, how to scope it and how to find the agents nobody registered.
The basics, in two answers.
AI agent security is the practice of controlling what AI agents can access and do: which identities and credentials they use, what data they can reach and which actions they may take on their own. Almost all of it is access control rather than model behaviour.
Non-human identity security covers every machine identity. AI agent security is the part where the identity also decides its own actions, which means unused permissions become used ones and the input steering it can come from outside the organisation.
The same picture from a different starting point.
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