Bedrock Agentcore > Structures > Evaluator Evaluator¶ Structure Class¶ Evaluator dataclass ¶ An evaluator to run against sessions during batch evaluation. Attributes¶ evaluator_id instance-attribute ¶ evaluator_id: str The unique identifier of the evaluator. Can reference built-in evaluators (e.g., Builtin.Helpfulness) or custom evaluators.