Choice

Use Choice to route an input to one of 1–26 options. Add an other or unclear option when your list may not cover the input.

{
  "team": {
    "type": "choice",
    "instructions": "Which team owns the ticket?",
    "criteria": {
      "billing": "Payment issues",
      "shipping": "Delivery issues",
      "other": "No matching team"
    }
  }
}

An illustrative answer:

{
  "type": "choice",
  "choice": "billing",
  "confidence": 0.7,
  "probabilities": {"billing": 0.8, "shipping": 0.1, "other": 0.1}
}

Confidence is (top_probability - 1/n) / (1 - 1/n). It compares the winner with a uniform distribution — it is not the measured probability that the answer is correct.

Criteria values can be descriptions, structured JSON, or null when a key is clear on its own. Test descriptions on your own cases. A single option returns probability 1 without inference, so it cannot test model quality.