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Showing content from https://docs.aws.amazon.com/step-functions/latest/apireference/API_TagResource.html below:

TagResource

Add a tag to a Step Functions resource.

An array of key-value pairs. For more information, see Using Cost Allocation Tags in the AWS Billing and Cost Management User Guide, and Controlling Access Using IAM Tags.

Tags may only contain Unicode letters, digits, white space, or these symbols: _ . : / = + - @.

Request Syntax

{
   "resourceArn": "string",
   "tags": [ 
      { 
         "key": "string",
         "value": "string"
      }
   ]
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

The Amazon Resource Name (ARN) for the Step Functions state machine or activity.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 256.

Required: Yes

The list of tags to add to a resource.

Tags may only contain Unicode letters, digits, white space, or these symbols: _ . : / = + - @.

Type: Array of Tag objects

Required: Yes

Response Elements

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

Errors

For information about the errors that are common to all actions, see Common Errors.

InvalidArn

The provided Amazon Resource Name (ARN) is not valid.

HTTP Status Code: 400

ResourceNotFound

Could not find the referenced resource.

HTTP Status Code: 400

TooManyTags

You've exceeded the number of tags allowed for a resource. See the Limits Topic in the AWS Step Functions Developer Guide.

HTTP Status Code: 400