Developers can now create and test Admin action and block extensions in their dev stores. These new extensions enable you to seamlessly integrate your app's functionality into the Shopify admin by embedding workflows and UX on core admin pages. By giving merchants access to your app's functionality, without the need to navigate away from their current task, these extensions help merchants be more efficient and productive.
Admin actions and blocks can use direct API access, enabling them to use the Admin GraphQL API without having to proxy the calls through their app's backend resulting in faster and more responsive apps.
Learn more about Admin action and block extensions on Shopify.dev.