AI RESEARCH
The Mirror Design Pattern: Strict Data Geometry over Model Scale for Prompt Injection Detection
arXiv CS.AI
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ArXi:2603.11875v1 Announce Type: cross Prompt injection defenses are often framed as semantic understanding problems and delegated to increasingly large neural detectors. For the first screening layer, however, the requirements are different: the detector runs on every request and therefore must be fast, deterministic, non-promptable, and auditable. We