# tiktok_create_lookalike_audience

> Create a TikTok lookalike audience from a source audience of this advertiser: at least 100 people and not itself a lookalike.

[Documentation](https://www.getmcpads.com/docs) / [Sources](https://www.getmcpads.com/docs/sources) / [TikTok Ads](https://www.getmcpads.com/docs/sources/tiktok-ads)

Create a TikTok lookalike audience from a source audience of this advertiser: at least 100 people and not itself a lookalike. TikTok builds it within 48 hours. Include it with audience_ids or exclude it with excluded_audience_ids on an ad group. Local preview by default. No automatic retry; advertiser ownership is checked before applying.

> **Warning** This tool changes the account. It is absent from the tool list on the Free plan, and it previews by default: without `confirm: true` it describes the change and applies nothing.

|  |  |
| --- | --- |
| Source | [TikTok Ads](https://www.getmcpads.com/docs/sources/tiktok-ads) |
| Kind | Write |
| Discovery | Reachable through `search_tools` and `run_tool` |
| Account parameter | `advertiserId` |
| Endpoint | https://mcp.getmcpads.com/tiktok-ads/mcp |

## Parameters

| Name | Type | Required | Notes |
| --- | --- | --- | --- |
| `advertiserId` | string | Required | Exact TikTok numeric ID as a string, never a rounded JavaScript number. |
| `name` | string | Required | Exact audience name, 128 characters at most. |
| `sourceAudienceId` | string | Required | Source audience ID in this advertiser (customer file or rule audience). |
| `includeSource` | boolean | Required | Whether the lookalike also contains the source audience. |
| `mobileOs` | string | Required | Devices of the lookalike. One of: `ALL`, `ANDROID`, `IOS`. |
| `placements` | array | Required | Native placements, for example ["TikTok"]; TikTok also documents Pangle. |
| `locationIds` | array | Required | Lookalike country codes, for example ["FR"]. |
| `audienceSize` | string | Required | Similarity against reach. One of: `NARROW`, `BALANCED`, `BROAD`. |
| `confirm` | boolean | Optional | Apply only when true. Default is a local preview without any TikTok call. Never retry an uncertain POST automatically. |

## Calling it

Through run_tool, since it is not announced

```json
{
  "name": "run_tool",
  "arguments": {
    "name": "tiktok_create_lookalike_audience",
    "args": {
      "advertiserId": "<string>",
      "name": "<string>",
      "sourceAudienceId": "<string>",
      "includeSource": "<boolean>",
      "mobileOs": "ALL",
      "placements": "<array>",
      "locationIds": "<array>",
      "audienceSize": "NARROW"
    }
  }
}
```

- [TikTok Ads metrics](https://www.getmcpads.com/docs/sources/tiktok-ads/metrics): What you can ask for.
- [TikTok Ads dimensions](https://www.getmcpads.com/docs/sources/tiktok-ads/dimensions): How you can break it down.

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