# Built-in evaluators
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Built-in evaluators in AgentCore AgentCore Evaluations provide pre-configured evaluator for assessing your agents. These evaluators use predefined evaluator models and prompt templates that have been optimized for common evaluation scenarios.

You can use built-in evaluators with both online and on-demand evaluations. To specify a built-in evaluator, use its ID in the following format: `Builtin.EvaluatorName` , such as `Builtin.Helpfulness`.

**Note**  
Built-in evaluator configurations, including their evaluator models and prompt templates, cannot be modified.

**Topics**
+ [Cross region inference](evaluations-cross-region-inference.md)
+ [Prompt templates](prompt-templates-builtin.md)