RespondDecisionTaskCompleted - Amazon Simple Workflow Service


Used by deciders to tell the service that the DecisionTask identified by the taskToken has successfully completed. The decisions argument specifies the list of decisions made while processing the task.

A DecisionTaskCompleted event is added to the workflow history. The executionContext specified is attached to the event in the workflow execution history.

Access Control

If an IAM policy grants permission to use RespondDecisionTaskCompleted, it can express permissions for the list of decisions in the decisions parameter. Each of the decisions has one or more parameters, much like a regular API call. To allow for policies to be as readable as possible, you can express permissions on decisions as if they were actual API calls, including applying conditions to some parameters. For more information, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.

Request Syntax

{ "decisions": [ { "cancelTimerDecisionAttributes": { "timerId": "string" }, "cancelWorkflowExecutionDecisionAttributes": { "details": "string" }, "completeWorkflowExecutionDecisionAttributes": { "result": "string" }, "continueAsNewWorkflowExecutionDecisionAttributes": { "childPolicy": "string", "executionStartToCloseTimeout": "string", "input": "string", "lambdaRole": "string", "tagList": [ "string" ], "taskList": { "name": "string" }, "taskPriority": "string", "taskStartToCloseTimeout": "string", "workflowTypeVersion": "string" }, "decisionType": "string", "failWorkflowExecutionDecisionAttributes": { "details": "string", "reason": "string" }, "recordMarkerDecisionAttributes": { "details": "string", "markerName": "string" }, "requestCancelActivityTaskDecisionAttributes": { "activityId": "string" }, "requestCancelExternalWorkflowExecutionDecisionAttributes": { "control": "string", "runId": "string", "workflowId": "string" }, "scheduleActivityTaskDecisionAttributes": { "activityId": "string", "activityType": { "name": "string", "version": "string" }, "control": "string", "heartbeatTimeout": "string", "input": "string", "scheduleToCloseTimeout": "string", "scheduleToStartTimeout": "string", "startToCloseTimeout": "string", "taskList": { "name": "string" }, "taskPriority": "string" }, "scheduleLambdaFunctionDecisionAttributes": { "control": "string", "id": "string", "input": "string", "name": "string", "startToCloseTimeout": "string" }, "signalExternalWorkflowExecutionDecisionAttributes": { "control": "string", "input": "string", "runId": "string", "signalName": "string", "workflowId": "string" }, "startChildWorkflowExecutionDecisionAttributes": { "childPolicy": "string", "control": "string", "executionStartToCloseTimeout": "string", "input": "string", "lambdaRole": "string", "tagList": [ "string" ], "taskList": { "name": "string" }, "taskPriority": "string", "taskStartToCloseTimeout": "string", "workflowId": "string", "workflowType": { "name": "string", "version": "string" } }, "startTimerDecisionAttributes": { "control": "string", "startToFireTimeout": "string", "timerId": "string" } } ], "executionContext": "string", "taskList": { "name": "string" }, "taskListScheduleToStartTimeout": "string", "taskToken": "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 list of decisions (possibly empty) made by the decider while processing this decision task. See the docs for the Decision structure for details.

Type: Array of Decision objects

Required: No


User defined context to add to workflow execution.

Type: String

Length Constraints: Maximum length of 32768.

Required: No


The task list to use for the future decision tasks of this workflow execution. This list overrides the original task list you specified while starting the workflow execution.

Type: TaskList object

Required: No


Specifies a timeout (in seconds) for the task list override. When this parameter is missing, the task list override is permanent. This parameter makes it possible to temporarily override the task list. If a decision task scheduled on the override task list is not started within the timeout, the decision task will time out. Amazon SWF will revert the override and schedule a new decision task to the original task list.

If a decision task scheduled on the override task list is started within the timeout, but not completed within the start-to-close timeout, Amazon SWF will also revert the override and schedule a new decision task to the original task list.

Type: String

Length Constraints: Maximum length of 8.

Required: No


The taskToken from the DecisionTask.


taskToken is generated by the service and should be treated as an opaque value. If the task is passed to another process, its taskToken must also be passed. This enables it to provide its progress and respond with results.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Required: Yes

Response Elements

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


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


Returned when the caller doesn't have sufficient permissions to invoke the action.

HTTP Status Code: 400


Returned when the named resource cannot be found with in the scope of this operation (region or domain). This could happen if the named resource was never created or is no longer available for this operation.

HTTP Status Code: 400


RespondDecisionTaskCompleted Example

This example illustrates one usage of RespondDecisionTaskCompleted.

Sample Request

POST / HTTP/1.1 Host: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20111212 Firefox/3.6.25 ( .NET CLR 3.5.30729; .NET4.0E) Accept: application/json, text/javascript, */* Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Content-Type: application/x-amz-json-1.0 X-Requested-With: XMLHttpRequest X-Amz-Date: Sun, 15 Jan 2012 23:31:06 GMT X-Amz-Target: SimpleWorkflowService.RespondDecisionTaskCompleted Content-Encoding: amz-1.0 X-Amzn-Authorization: AWS3 AWSAccessKeyId=AKIAIOSFODNN7EXAMPLE,Algorithm=HmacSHA256,SignedHeaders=Host;X-Amz-Date;X-Amz-Target;Content-Encoding,Signature=FL4ouCb8n6j5egcKOXoa+5Vctc8WmA91B2ekKnks2J8= Referer: Content-Length: 1184 Pragma: no-cache Cache-Control: no-cache { "executionContext": "Black Friday", "decisions": [ { "scheduleActivityTaskDecisionAttributes": { "control": "digital music", "taskList": { "name": "specialTaskList" }, "scheduleToCloseTimeout": "900", "activityType": { "version": "1.0", "name": "activityVerify" }, "heartbeatTimeout": "120", "activityId": "verification-27", "scheduleToStartTimeout": "300", "startToCloseTimeout": "600", "taskPriority": "100", "input": "5634-0056-4367-0923,12/12,437" }, "decisionType": "ScheduleActivityTask" } ], "taskToken": "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" }

Sample Response

HTTP/1.1 200 OK Content-Length: 0 Content-Type: application/json x-amzn-RequestId: feef79b5-3fd0-11e1-9a27-0760db01a4a8

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: