# decide (/mcp/decide)



Makes a decision, as [`POST /v1/decide`](/reference/decide), and returns the same response. No setup needed.

| Input       | Description                                                                                                                                                                               |
| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `data`      | The case's structured data: a JSON object or array (or text)                                                                                                                              |
| `context`   | Free text about the case: notes, messages, documents                                                                                                                                      |
| `questions` | Required. Names to questions, each with `type` (`noul`, `choice`, `multi_choice` or `score`), `instructions`, `criteria` and optional `base_rate`, as in [Decisions](/concepts/decisions) |
| `model`     | Optional. `grayson-1` by default                                                                                                                                                          |
| `api_key`   | `/mcp/keys` only                                                                                                                                                                          |

Send `data`, `context` or both; up to 32,768 tokens with the questions. Put definitions and policy in the instructions and criteria, act on probabilities with thresholds you choose, and add a `base_rate` when the user knows how common an answer is in their cases ([Calibration](/concepts/calibration#base-rates-for-decisions)).

```json title="Arguments"
{
  "context": "Login from a new device in Lagos, then a $4,900 wire to a new payee 6 minutes later. Customer usually logs in from Ohio.",
  "questions": {
    "is_ato": { "type": "noul", "instructions": "Is this account takeover?" },
    "next_step": {
      "type": "choice",
      "instructions": "What should the analyst do next?",
      "criteria": { "block": "Block the wire and call the customer", "review": "Hold for manual review", "allow": "Let it through" }
    }
  }
}
```