# tags.update

Change a project tag with id, expectedRevision and idempotencyKey: rename, recolor, describe, set other names, move to a group or out of one (parentId null), set or clear the event window and budget, or archive and restore it (archived true or false). Archiving a group archives the tags inside it; restoring the group restores them.

`POST /api/v1/accounting/tags.update`

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

MCP tool: `accounting_tags_update`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `id` | string (ID) | Yes | The record's ID. |
| `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. at most 9007199254740991; greater than 0. |
| `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. |
| `name` | string |  | A display name. 1–80 characters. |
| `description` | string |  | A short description. at most 500 characters. |
| `color` | enum |  | One of: `gray`, `red`, `orange`, `amber`, `green`, `teal`, `blue`, `purple`, `pink`. |
| `aliases` | array of strings |  | at most 10 items; each 2–60 characters. |
| `parentId` | string (ID) or null |  |  |
| `startsOn` | string or null |  |  |
| `endsOn` | string or null |  |  |
| `budgetMinor` | string or null |  | An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50. |
| `budgetCurrency` | string or null |  |  |
| `archived` | boolean |  | Whether the record is archived. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/tags.update \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
  "expectedRevision": 3
}'
```

Reference page: https://app.getoatmilk.com/docs/api/tags.update