Policy reviews and runtime guardrails solve different problems. A policy review decides whether an AI system or agent is appropriate for a use case and what conditions apply. Runtime guardrails help enforce those conditions while the system is operating.
Teams need both. A review without runtime controls depends too much on human memory. Guardrails without review may enforce the wrong boundaries.
What policy reviews are good for
Policy reviews examine purpose, user impact, data access, autonomy, legal obligations, security posture, privacy implications, and business risk. They help decide whether a system can launch, which risk tier applies, who must approve it, and what controls are required.
A strong review creates a decision record. It should explain why the system is allowed, what conditions apply, and when the decision should be revisited.
What runtime guardrails are good for
Runtime guardrails operate during use. They can restrict tools, require approvals, block sensitive data exposure, detect prompt injection, validate outputs, enforce user permissions, limit actions, log events, and trigger incidents.
Guardrails are especially important for agents because risk can occur at the moment of action. If a policy says an agent cannot send external emails without review, the runtime workflow should enforce that before the message is sent.
Where teams get it wrong
Some teams rely only on policy review. They approve the use case, train users, and hope the system stays inside its intended path. That breaks when prompts, tools, users, retrieval sources, or model behavior change.
Other teams rely only on technical guardrails. They block certain outputs or actions but never decide whether the use case should exist, what obligations apply, or who owns the residual risk.
Connect the two
The review should define the required controls. The runtime should enforce or observe those controls. The evidence layer should connect runtime events back to the approved system record.
When a guardrail blocks an action, logs an override, or routes human review, that event should strengthen the governance record. The result is a program that does not end at approval and does not treat guardrails as disconnected security plumbing.