---
title: "Validator / Guardrail · agent building block · Agent Fieldbook"
url: https://agentfieldbook.org/design/building_blocks/validator/
description: "checks outputs against policy/safety"
section: "Design · Building Blocks · Node"
source: Agent Fieldbook — generated from the published page
---

# Validator / Guardrail

checks outputs against policy/safety

## What it does

## At a glance

| Field | Value |
| --- | --- |
| Kind | Functional node |
| Example agents | enterprise agents |

## Basis

- [owasp.org](https://owasp.org/www-project-top-10-for-large-language-model-applications/)