Treat every prompt as a trust boundary
Identify the trust boundary between developer instructions, user intent, retrieved content, and tool actions.
The move: draw the boundary before the model blends the room. Prompt injection becomes dangerous when untrusted text is allowed to act like trusted instruction. A model can read a customer email, a web page, a resume, or a retrieved knowledge-base article, but that does not mean those sources should steer the application. The security question is not only what the prompt says. It is which parts of the prompt carry authority. Trusted control System and developer instructions define the job, limits, data rules, and tool policy. These should be short, explicit, and hard to confuse with evidence. User intent…
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