> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v24** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/Campaign.MessagingRestriction).

Freeform instructions that will be used to guide text asset generation using LLM inference.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v24/resources/campaign.proto)

| Fields ||
|---|---|
| ## `restriction_text` | `string` Freeform instructions to guide text asset generation using LLM inference. Valid instructions may contain a maximum of 300 characters. |
| ## `restriction_type` | `MessagingRestrictionType` Determines how the guideline is applied. Only `RESTRICTION_BASED_EXCLUSION` is currently supported. |