# addContactsToList

Add contacts to one or more LISTS (segments) by list id (searchContactTags `lists` / createContactList): the selection-wide form of updateContact’s addToListIds; removeContactsFromList is the twin. Async bulk job: returns a bulkTaskId to poll with getBulkTask; an immediate read-back will not show the change. A contact already on the list is skipped, not failed, so re-running is harmless. LIST ids only: a free-form tag or custom-field id is refused at the gateway (the underlying worker would silently drop it and complete having changed nothing). POTENTIALLY OUTBOUND: list membership publishes the same tags-changed event tags do, so a CONTACT workflow triggered on this list can start a run and send. Check the org’s workflows or confirm with the user before a large selection.

- Call: `POST https://server.goliathdata.com/api/v1/call` with `{ "operationId": "addContactsToList", "variables": {...} }`
- Scope: `WRITE`
- Type: mutation
- Idempotency: honors `Idempotency-Key` (24 h)
- Rate-limited: no

## Variables

- `contactIds`: `[String!]!` (required)
- `listIds`: `[String!]!` (required)

## Response (data, an example)

```json
{
  "contactMutation": {
    "addContactsToList": {
      "mode": "SYNC",
      "bulkTaskId": "…"
    }
  }
}
```

## Example

```bash
curl https://server.goliathdata.com/api/v1/call \
  -H "Authorization: Bearer $GOLIATH_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "operationId": "addContactsToList",
    "variables": {
      "contactIds": [
        "<String>"
      ],
      "listIds": [
        "<String>"
      ]
    }
  }'
```