A pre-inference gate is a control layer that validates evidence before a model is allowed to score it. It checks whether inputs are authentic, current, correctly timed, and tied to the right policy version. If a record is unverifiable, stale, duplicated, or created after the event it claims to support, the gate can block it, quarantine it, or send it for manual review.
This matters in cyber security because attackers may try to poison decision pipelines with forged documents, stale context, or misleading metadata so an automated system makes the wrong call. Defenders use pre-inference gates to enforce provenance checks, schema validation, temporal consistency, and allowlists before any prediction happens. That is different from explainability tools, which describe how a model used data after the fact. A pre-inference gate stops bad evidence from entering the model at all, which is often the stronger control.