Definition
Trust boundary
A point in a system architecture where trust assumptions change — where data or control moves from a trusted context to a less trusted one, or vice versa. In agentic AI deployments, key trust boundaries include the boundary between the system prompt and user input, between the agent's local environment and external services reached via MCP, between the agent's declared permissions and the actual permissions granted by the OS, and between content retrieved from the web and instructions the agent should execute.
Related terms
Operator controls
Deterministic controls implemented in code — outside the AI model — that govern what an agent is per…
Least privilege
A security principle requiring that every component in a system — including AI agent skills — operat…
Excessive agency
OWASP's term (LLM06:2025) for the condition where an AI agent is granted more capabilities, permissi…
System prompt
Instructions passed to an AI model before the user's message, typically used to define the model's p…
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