# ai.subscriptions.chat.update

Choose your own subscription connection for Ask AI or return to the existing online model preferences. Never selects another person's connection or bypasses a local-only rule. Human sign-in required.

`POST /api/v1/accounting/ai.subscriptions.chat.update`

Permissions: `accounting:read`, `accounting:write` · Roles: admin, finance, contributor · Idempotency key required · Send `expectedRevision`

Not available over MCP: Choosing and sharing a personal subscription is the signed-in person's explicit choice in Settings or the CLI, never an agent's delegation.

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `choice` | object | Yes |  |
| `choice.source` | "gateway" | Yes | Where the record came from. |
| `choice.modelId` | string or null | Yes |  |
| `choice.effort` | enum or null | Yes | One of: `none`, `low`, `medium`, `high`, `xhigh`, `max`, `ultra`. |
| `choice.source` | "subscription" | Yes | Where the record came from. |
| `choice.connectionId` | string (ID) | Yes | The ID of the related record. |
| `choice.modelId` | string | Yes | 1–160 characters; Matches ^[a-zA-Z0-9][a-zA-Z0-9_./:@+-]*$. |
| `choice.effort` | enum or null | Yes | One of: `none`, `low`, `medium`, `high`, `xhigh`, `max`, `ultra`. |
| `expectedRevision` | integer | Yes | The record's current revision, from the last time you read it. If someone changed the record since, the request is refused with a conflict so you can reload and check before trying again. 0 to 9007199254740991. |
| `idempotencyKey` | string | Yes | Any unique text you generate once per intended change, so a retried request only happens once. Send it as the Idempotency-Key header instead if you prefer; if you send both they must match. 8–200 characters. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/ai.subscriptions.chat.update \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "choice": {
    "source": "gateway",
    "modelId": "model_id",
    "effort": "none"
  },
  "expectedRevision": 3
}'
```

Reference page: https://app.getoatmilk.com/docs/api/ai.subscriptions.chat.update