{
  "description": "Updates an existing service.",
  "input_method": "stdin",
  "parameters": {
    "service": {
      "description": "The service to update",
      "type": "String[1]"
    },
      "image": {
          "description": "The new image to use for the service",
          "type": "String[1]"
      },
      "constraint_add": {
        "description": "Add or update a service constraint (selector==value, selector!=value)",
        "type": "Optional[Array]"
      },
      "constraint_rm": {
        "description": "Remove a service constraint if exists.",
        "type": "Optional[Array]"
      }
  }
}