# UpdateEvaluator
Updates a custom evaluator's configuration, description, or evaluation level. Built-in evaluators cannot be updated. The evaluator must not be locked for modification.
## Request Syntax
```
PUT /evaluators/evaluatorId HTTP/1.1
Content-type: application/json
{
"clientToken": "string",
"description": "string",
"evaluatorConfig": { ... },
"level": "string"
}
```
## URI Request Parameters
The request uses the following URI parameters.
** [evaluatorId](#API_UpdateEvaluator_RequestSyntax) **
The unique identifier of the evaluator to update.
Pattern: `(Builtin.[a-zA-Z0-9_-]+|[a-zA-Z][a-zA-Z0-9-_]{0,99}-[a-zA-Z0-9]{10})`
Required: Yes
## Request Body
The request accepts the following data in JSON format.
** [clientToken](#API_UpdateEvaluator_RequestSyntax) **
A unique, case-sensitive identifier to ensure that the API request completes no more than one time. If you don't specify this field, a value is randomly generated for you. If this token matches a previous request, the service ignores the request, but doesn't return an error. For more information, see [Ensuring idempotency](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Run_Instance_Idempotency.html).
Type: String
Length Constraints: Minimum length of 33. Maximum length of 256.
Pattern: `[a-zA-Z0-9](-*[a-zA-Z0-9]){0,256}`
Required: No
** [description](#API_UpdateEvaluator_RequestSyntax) **
The updated description of the evaluator.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 200.
Required: No
** [evaluatorConfig](#API_UpdateEvaluator_RequestSyntax) **
The updated configuration for the evaluator. Specify either LLM-as-a-Judge settings with instructions, rating scale, and model configuration, or code-based settings with a customer-managed Lambda function.
Type: [EvaluatorConfig](API_EvaluatorConfig.md) object
**Note: **This object is a Union. Only one member of this object can be specified or returned.
Required: No
** [level](#API_UpdateEvaluator_RequestSyntax) **
The updated evaluation level (`TOOL_CALL`, `TRACE`, or `SESSION`) that determines the scope of evaluation.
Type: String
Valid Values: `TOOL_CALL | TRACE | SESSION`
Required: No
## Response Syntax
```
HTTP/1.1 202
Content-type: application/json
{
"evaluatorArn": "string",
"evaluatorId": "string",
"status": "string",
"updatedAt": number
}
```
## Response Elements
If the action is successful, the service sends back an HTTP 202 response.
The following data is returned in JSON format by the service.
** [evaluatorArn](#API_UpdateEvaluator_ResponseSyntax) **
The Amazon Resource Name (ARN) of the updated evaluator.
Type: String
Pattern: `arn:aws:bedrock-agentcore:[a-z0-9-]+:[0-9]{12}:evaluator\/[a-zA-Z][a-zA-Z0-9-_]{0,99}-[a-zA-Z0-9]{10}$|^arn:aws:bedrock-agentcore:::evaluator/Builtin.[a-zA-Z0-9_-]+`
** [evaluatorId](#API_UpdateEvaluator_ResponseSyntax) **
The unique identifier of the updated evaluator.
Type: String
Pattern: `(Builtin.[a-zA-Z0-9_-]+|[a-zA-Z][a-zA-Z0-9-_]{0,99}-[a-zA-Z0-9]{10})`
** [status](#API_UpdateEvaluator_ResponseSyntax) **
The status of the evaluator update operation.
Type: String
Valid Values: `ACTIVE | CREATING | CREATE_FAILED | UPDATING | UPDATE_FAILED | DELETING`
** [updatedAt](#API_UpdateEvaluator_ResponseSyntax) **
The timestamp when the evaluator was last updated.
Type: Timestamp
## Errors
For information about the errors that are common to all actions, see [Common Errors](CommonErrors.md).
** AccessDeniedException **
This exception is thrown when a request is denied per access permissions
HTTP Status Code: 403
** ConflictException **
This exception is thrown when there is a conflict performing an operation
HTTP Status Code: 409
** InternalServerException **
This exception is thrown if there was an unexpected error during processing of request
HTTP Status Code: 500
** ResourceNotFoundException **
This exception is thrown when a resource referenced by the operation does not exist
HTTP Status Code: 404
** ServiceQuotaExceededException **
This exception is thrown when a request is made beyond the service quota
HTTP Status Code: 402
** ThrottlingException **
This exception is thrown when the number of requests exceeds the limit
HTTP Status Code: 429
** ValidationException **
The input fails to satisfy the constraints specified by the service.
HTTP Status Code: 400
## See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
+ [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)
+ [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/bedrock-agentcore-control-2023-06-05/UpdateEvaluator)