@Override
    public DescribeAgentVersionsResult describeAgentVersions(DescribeAgentVersionsRequest request) {
        request = beforeClientExecution(request);
        return executeDescribeAgentVersions(request);
    }
<p>
Describes the available OpsWorks Stacks agent versions. You must specify a stack ID or a configuration manager.
<code>DescribeAgentVersions</code> returns a list of available agent versions for the specified stack or
configuration manager.
</p>

@param describeAgentVersionsRequest
@return Result of the DescribeAgentVersions operation returned by the service.
@throws ValidationException
        Indicates that a request was not valid.
@throws ResourceNotFoundException
        Indicates that a resource was not found.
@sample AWSOpsWorks.DescribeAgentVersions
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/opsworks-2013-02-18/DescribeAgentVersions" target="_top">AWS
     API Documentation</a>
aws-java-sdk-opsworks/src/main/java/com/amazonaws/services/opsworks/AWSOpsWorksClient.java