Security boundaries for agentic interfaces

An agent should reason about a request, but the server must remain responsible for permissions and consequential actions.

A conversational interface may feel unified, but its security model should be deliberately separated. The model can interpret intent and prepare a proposed action; it should not decide whether it has permission to execute that action.

Server-side controls must validate inputs, enforce authorization, limit tools, protect secrets, and record the final confirmed operation. Prompt instructions are not a substitute for these controls.

This separation makes the experience safer and easier to test. The model proposes, the interface confirms, and trusted application code decides what is allowed.

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