# `POST /modelconversation`

Protected. Requires a valid session cookie (`credentials: 'include'`).

Create conversation

Creates a new conversation in state `idle`.

## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `provider` | yes | string |  |
| `model` | yes | string |  |

```json
{
  "provider": "…",
  "model": "…"
}
```

## Signals

On success, emits SSE signal: `modelconversation` (see [`GET /events`](../events.md)).

## Response `201`

Created conversation

```json
{
  "conversation": {
    "id": 1,
    "companyuser_id": 1,
    "provider": "…",
    "model": "…",
    "created_at": "…",
    "updated_at": "…",
    "state": "idle",
    "started_by": 1,
    "first_message": "…"
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Invalid input or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |

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