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

Specifies an evaluator for Amazon Bedrock AgentCore. An evaluator assesses agent quality using LLM-as-a-Judge configurations to measure and improve agent performance.

For more information, see [Evaluate agent quality with Amazon Bedrock AgentCore](https://docs.aws.amazon.com/bedrock-agentcore/latest/devguide/evaluators.html).

See the **Properties** section below for descriptions of both the required and optional properties.

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

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

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

```
{
  "Type" : "AWS::BedrockAgentCore::Evaluator",
  "Properties" : {
      "[Description](#cfn-bedrockagentcore-evaluator-description)" : String,
      "[EvaluatorConfig](#cfn-bedrockagentcore-evaluator-evaluatorconfig)" : EvaluatorConfig,
      "[EvaluatorName](#cfn-bedrockagentcore-evaluator-evaluatorname)" : String,
      "[Level](#cfn-bedrockagentcore-evaluator-level)" : String,
      "[Tags](#cfn-bedrockagentcore-evaluator-tags)" : [ Tag, ... ]
    }
}
```

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

```
Type: AWS::BedrockAgentCore::Evaluator
Properties:
  [Description](#cfn-bedrockagentcore-evaluator-description): String
  [EvaluatorConfig](#cfn-bedrockagentcore-evaluator-evaluatorconfig): 
    EvaluatorConfig
  [EvaluatorName](#cfn-bedrockagentcore-evaluator-evaluatorname): String
  [Level](#cfn-bedrockagentcore-evaluator-level): String
  [Tags](#cfn-bedrockagentcore-evaluator-tags): 
    - Tag
```

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

`Description`  <a name="cfn-bedrockagentcore-evaluator-description"></a>
 The description of the evaluator.   
*Required*: No  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `200`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`EvaluatorConfig`  <a name="cfn-bedrockagentcore-evaluator-evaluatorconfig"></a>
 The configuration of the evaluator, including LLM-as-a-Judge settings for custom evaluators.   
*Required*: Yes  
*Type*: [EvaluatorConfig](aws-properties-bedrockagentcore-evaluator-evaluatorconfig.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`EvaluatorName`  <a name="cfn-bedrockagentcore-evaluator-evaluatorname"></a>
 The name of the evaluator.   
*Required*: Yes  
*Type*: String  
*Pattern*: `^[a-zA-Z][a-zA-Z0-9_]{0,47}$`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`Level`  <a name="cfn-bedrockagentcore-evaluator-level"></a>
 The evaluation level (`TOOL_CALL`, `TRACE`, or `SESSION`) that determines the scope of evaluation.   
*Required*: Yes  
*Type*: String  
*Allowed values*: `TOOL_CALL | TRACE | SESSION`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Tags`  <a name="cfn-bedrockagentcore-evaluator-tags"></a>
The tags for the evaluator.  
*Required*: No  
*Type*: Array of [Tag](aws-properties-bedrockagentcore-evaluator-tag.md)  
*Maximum*: `50`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

## Return values
<a name="aws-resource-bedrockagentcore-evaluator-return-values"></a>

### Ref
<a name="aws-resource-bedrockagentcore-evaluator-return-values-ref"></a>

When you pass the logical ID of this resource to the intrinsic `Ref` function, `Ref` returns the ARN of the evaluator. For example:

 `arn:aws:bedrock-agentcore:us-east-1:123456789012:evaluator/EXAMPLE12345` 

For more information about using the `Ref` function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html).

### Fn::GetAtt
<a name="aws-resource-bedrockagentcore-evaluator-return-values-fn--getatt"></a>

The `Fn::GetAtt` intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the `Fn::GetAtt` intrinsic function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html).

#### 
<a name="aws-resource-bedrockagentcore-evaluator-return-values-fn--getatt-fn--getatt"></a>

`CreatedAt`  <a name="CreatedAt-fn::getatt"></a>
The timestamp when the evaluator was created.

`EvaluatorArn`  <a name="EvaluatorArn-fn::getatt"></a>
The Amazon Resource Name (ARN) of the evaluator.

`EvaluatorId`  <a name="EvaluatorId-fn::getatt"></a>
The unique identifier of the evaluator.

`Status`  <a name="Status-fn::getatt"></a>
The current status of the evaluator.

`UpdatedAt`  <a name="UpdatedAt-fn::getatt"></a>
The timestamp when the evaluator was last updated.