<p>Records a <code>WorkflowExecutionSignaled</code> event in the workflow execution history and creates a decision task for the workflow execution identified by the given domain, workflowId and runId. The event is recorded with the specified user defined signalName and input (if provided).</p> <note> <p>If a runId isn't specified, then the <code>WorkflowExecutionSignaled</code> event is recorded in the history of the current open workflow with the matching workflowId in the domain.</p> </note> <note> <p>If the specified workflow execution isn't open, this method fails with <code>UnknownResource</code>.</p> </note> <p> <b>Access Control</b> </p> <p>You can use IAM policies to control this action's access to Amazon SWF resources as follows:</p> <ul> <li> <p>Use a <code>Resource</code> element with the domain name to limit the action to only specified domains.</p> </li> <li> <p>Use an <code>Action</code> element to allow or deny permission to call this action.</p> </li> <li> <p>You cannot use an IAM policy to constrain this action's parameters.</p> </li> </ul> <p>If the caller doesn't have sufficient permissions to invoke the action, or the parameter values fall outside the specified constraints, the action fails. The associated event attribute's <code>cause</code> parameter is set to <code>OPERATION_NOT_PERMITTED</code>. For details and example IAM policies, see <a href="https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html">Using IAM to Manage Access to Amazon SWF Workflows</a> in the <i>Amazon SWF Developer Guide</i>.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}