# Holdout scenarios

Checks stored outside the codebase, where the agent cannot see them.

**Is a:** [Guard](/reference/ontology/unattended-agent-failures/guard)

StrongDM moved its checks to scenarios stored outside the codebase, "similar to a 'holdout' set in model training", judged by an LLM ([StrongDM, Software Factories](https://factory.strongdm.ai/)).

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Published 2026-10-29. Web page: https://www.mackenziebowes.com/reference/ontology/unattended-agent-failures/holdout-scenarios