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reference monitor
also agentic reference monitor or AI agent reference monitor or LLM-agent reference monitor
Definition of reference monitor
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: an external security mechanism that intercepts an AI agent's attempts to access data or take actions and enforces authorization rules in a way the agent cannot bypass or modify
- The reference monitor rejected the agent's request to send customer records to an unapproved domain.
- Every tool call passed through an agentic reference monitor before the executor received it.
Two meanings, one word
In everyday English
A monitor observes activity, while a reference point is used to decide whether something meets a rule or standard.
In AI
An external security mechanism that intercepts an AI agent's attempts to access data or take actions and enforces authorization rules in a way the agent cannot bypass or…
Origin & history
The reference-monitor concept was introduced in early computer-security work and formalized in James P. Anderson's 1972 Computer Security Technology Planning Study. Its classic requirements are that every relevant access be mediated, the mechanism resist tampering, and the mechanism remain small enough to analyze. In 2026, researchers increasingly applied the design to tool-using LLM agents by placing deterministic enforcement between a model and its tools.
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Cite this entry
"Reference monitor." AI Dictionary, Dadgogo, https://dadgogo.com/dictionary/reference-monitor/. Accessed 10 Oct. 2026.