The `AiProviderInterface` has method ```php /** * Returns the supported capabilities for this provider. * * @return array * List of supported capabilities. */ public function getSupportedCapabilities(): array; ``` This method exposes the capabilities of the provider. The base class implements this method, but obviously it returns empty array as each instance of the plugin has its own values. In this issue https://git.drupalcode.org/project/ai/-/work_items/3586425 the check of capabilities will be added. As Gemini provider at the moment doesn't state that it is capable of streamed responses, users that have Gemini will have a fallback to normal output in CKEditor.