# ChatChoice

> Tracon documentation. Tracon is a .NET package family that adds a control
> plane on Microsoft Agent Framework, published as NuGet packages that run
> inside your own ASP.NET Core application.
>
> Page: https://tracon.dev/http-api/schemas/chatchoice/
> Summary: OpenAPI request or response schema for ChatChoice, including required fields, defaults, constraints, and linked nested types.

[← All HTTP schemas](/http-api/schemas/)

**Shape:** `object`

| Property | Required | Type | Description | Rules |
|---|---|---|---|---|
| `index` | yes | `integer (int32)` | — | pattern `^-?(?:0\\|[1-9]\d*)$` |
| `message` | yes | [`ChatMessagePayload`](/http-api/schemas/chatmessagepayload/) | — | — |
| `finish_reason` | yes | `string` | — | — |