CreateAdditionalAssignmentsForHIT - Amazon Mechanical Turk



The CreateAdditionalAssignmentsForHIT operation increases the maximum number of assignments of an existing HIT.

To extend the maximum number of assignments, specify the number of additional assignments.

  • HITs created with fewer than 10 assignments cannot be extended to have 10 or more assignments. Attempting to add assignments in a way that brings the total number of assignments for a HIT from fewer than 10 assignments to 10 or more assignments will result in an AWS.MechanicalTurk.InvalidMaximumAssignmentsIncrease exception.

  • HITs that were created before July 22, 2015 cannot be extended. Attempting to extend HITs that were created before July 22, 2015 will result in an AWS.MechanicalTurk.HITTooOldForExtension exception.

Request Syntax

{ "HITId": String, "NumberOfAdditionalAssignments": Integer, "UniqueRequestToken": String }

Request Parameters

The request accepts the following data in JSON format:

Name Description Required


The ID of the HIT to for which to request more assignments.

Type: String



The number of additional assignments to request for this HIT.

Type: Integer



A unique identifier for this request, which allows you to retry the call on error without extending the HIT multiple times. This is useful in cases such as network timeouts where it is unclear whether or not the call succeeded on the server. If the extend HIT already exists in the system from a previous call using the same UniqueRequestToken, subsequent calls will return an error with a message containing the request ID.

Type: String

Constraints: must not be longer than 64 characters in length.


Response Elements

A successful request for the CreateAdditionalAssignmentsForHIT operation returns with no errors and an empty body.


The following example shows how to use the CreateAdditionalAssignmentsForHIT operation:

Sample Request

The following example adds 2 more assignments to a HIT.

POST / HTTP/1.1 Host: Content-Length: <PayloadSizeBytes> X-Amz-Date: <Date> { HITId:"123RVAZW00EXAMPLE2SL3LSK", HITNumberOfAdditionalAssignments:2 }

Sample Response

The following is an example response:

HTTP/1.1 200 OK x-amzn-RequestId: <RequestId> Content-Type: application/x-amz-json-1.1 Content-Length: <PayloadSizeBytes> Date: <Date>