Edit:
Also, There is an Action “Read Incident” that takes the system_id as an input and allows you to choose the fields you want to see, e.g. number,state,active,description,short_description,caller,urgency
@hayden_redd as Brandon mentioned, we do have a Read Incident that can be used to lookup an incident by sys_id and return fields as defined in the comma separated list. Below is an example configuration I used in one of our environments to confirm:
In this case, I was only returning short_description; however, if multiple fields are wanted then it would be a comma separated list such as short_description, description, sys_id, assignment_group.
Output of those two actions together then looks like:
If you are already trying the Read Incident action, I would check to make sure the description is actually defined for the incident you are retrieving. When a field is defined that isn’t populated for the incident, the response should show that field as empty like below: