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# AWS::BedrockAgentCore::Evaluator LlmAsAJudgeEvaluatorConfig
<a name="aws-properties-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig"></a>

 The LLM-as-a-Judge configuration that uses a language model to evaluate agent performance based on custom instructions and rating scales. 

## Syntax
<a name="aws-properties-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-syntax.json"></a>

```
{
  "[Instructions](#cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-instructions)" : String,
  "[ModelConfig](#cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-modelconfig)" : EvaluatorModelConfig,
  "[RatingScale](#cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-ratingscale)" : RatingScale
}
```

### YAML
<a name="aws-properties-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-syntax.yaml"></a>

```
  [Instructions](#cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-instructions): String
  [ModelConfig](#cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-modelconfig): 
    EvaluatorModelConfig
  [RatingScale](#cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-ratingscale): 
    RatingScale
```

## Properties
<a name="aws-properties-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-properties"></a>

`Instructions`  <a name="cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-instructions"></a>
 The evaluation instructions that guide the language model in assessing agent performance, including criteria and evaluation guidelines.   
*Required*: Yes  
*Type*: String  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ModelConfig`  <a name="cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-modelconfig"></a>
 The model configuration that specifies which foundation model to use and how to configure it for evaluation.   
*Required*: Yes  
*Type*: [EvaluatorModelConfig](aws-properties-bedrockagentcore-evaluator-evaluatormodelconfig.md)  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`RatingScale`  <a name="cfn-bedrockagentcore-evaluator-llmasajudgeevaluatorconfig-ratingscale"></a>
 The rating scale that defines how the evaluator should score agent performance, either numerical or categorical.   
*Required*: Yes  
*Type*: [RatingScale](aws-properties-bedrockagentcore-evaluator-ratingscale.md)  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)