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Targets

The enum \TYPO3\CMS\Core\Action\Target defines the channels of an action:

Target Channel Authentication
Target::backend The backend user interface, see Calling the API from backend JavaScript The session of the logged-in backend user
Target::http The HTTP API for external applications and the OpenAPI document The access tokens of apps
Target::ai Tools for language models —

Most actions have all targets. Restrict an action to the backend if only the backend user interface uses it, for example because its result fits one component. Such an action is not in the OpenAPI document. A request with the access token of an app gets the status 404:

php 
use TYPO3\CMS\Core\Action\Target;

#[AsAction(
    route: 'my-extension/tree/configuration',
    targets: [Target::backend],
)]
public function configuration(): array
{
    // …
}

TYPO3 does not accept an empty list of targets when it compiles the dependency injection container.