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A guard is a protection module focused on a specific threat category. While a guardrail defines your overall protection policy, guards do the actual work of detecting and handling threats. Guards are the building blocks of Guardrails. Each Guard performs specific checks and/or transformations on the data. For instance, a Guard in an input Guardrail can check for security, while a Guard in an output Guardrail might check for moderation or privacy. A Guard belongs to one of the following categories:
  • Security
  • Moderation
  • Privacy
  • Integrity
  • Generic
Guards consist of a set of Detectors and how they should be executed.

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Next Steps

Detector

The detection engines inside guards

Configure Guardrails

Set up guards for your agent

Available Guards

Reference of all guard types
Last modified on April 14, 2026