{
  "type": "object",
  "required": [
    "taskToken",
    "activityId",
    "startedEventId",
    "workflowExecution",
    "activityType"
  ],
  "properties": {
    "taskToken": {
      "allOf": [
        {
          "$ref": "#/components/schemas/TaskToken"
        },
        {
          "description": "The opaque string used as a handle on the task. This token is used by workers to communicate progress and response information back to the system about the task."
        }
      ]
    },
    "activityId": {
      "allOf": [
        {
          "$ref": "#/components/schemas/ActivityId"
        },
        {
          "description": "The unique ID of the task."
        }
      ]
    },
    "startedEventId": {
      "allOf": [
        {
          "$ref": "#/components/schemas/EventId"
        },
        {
          "description": "The ID of the <code>ActivityTaskStarted</code> event recorded in the history."
        }
      ]
    },
    "workflowExecution": {
      "allOf": [
        {
          "$ref": "#/components/schemas/WorkflowExecution"
        },
        {
          "description": "The workflow execution that started this activity task."
        }
      ]
    },
    "activityType": {
      "allOf": [
        {
          "$ref": "#/components/schemas/ActivityType"
        },
        {
          "description": "The type of this activity task."
        }
      ]
    },
    "input": {
      "allOf": [
        {
          "$ref": "#/components/schemas/Data"
        },
        {
          "description": "The inputs provided when the activity task was scheduled. The form of the input is user defined and should be meaningful to the activity implementation."
        }
      ]
    }
  },
  "description": "Unit of work sent to an activity worker.",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "ActivityTask"
}