How does solidarity work for detecting that it is currently running on continuous integration?

Do I need to pass a flag? Example npx solidarity --ci

Also the question Should this rule be skipped on a Continuous Integration server? seems to output a "ci": true when selecting to skip the rule, is this intended or does "ci": true allow the rule to run on ci?

Example

{
  "requirements": [
    {
      "rule": "cli",
      "binary": "",
      "platform": [
        "macos",
        "linux"
      ],
      "ci": true
    }
  ]
}