
AI Guardrails: The Four Types, Where They Sit and How to Build Them
TL;DR AI guardrails are runtime checks that decide whether an AI system’s inputs, outputs and actions are allowed before they take effect. The four main kinds are input, output, tool or action, and policy guardrails. Each kind sits at a different point in the request path, from the user’s prompt to the final response. Teams build them with rules, classifiers,



