Prompt Injection Is Not a Bad Prompt. It Is a Boundary Failure.
Distinguish prompt injection from ordinary user input errors and explain why the difference changes the defense.
The teach Prompt injection is not “the model was gullible.” It is “the system let hostile text compete with trusted instructions.” A bad prompt creates confusion. Prompt injection creates authority confusion. The model stops treating a document, email, web page, or ticket as material to process and starts treating it as a new boss. That is why the fix is not just “prompt better.” The fix is to redesign the boundary between instructions, data, and actions. OWASP frames this as an application-security problem. Untrusted inputs need isolation, tool use needs constraints, and sensitive actions need approvals or policy checks. If…
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