How to migrate SiriKit intent to App intent?

To migrate SiriKit intents to App Intents, you should consider the following steps:

Evaluate Overlap: Determine if your app's functionality overlaps with existing SiriKit domains. If it does not, App Intents is the right framework for you.
Understand App Intents: App Intents is a framework that allows you to define a set of actions for Siri, Shortcuts, and other system experiences. It is designed to integrate your app with Siri and other Apple system features.
Adopt App Intents: Start by defining your app's core actions and content in a way that the system can understand. This involves creating app intents that represent the most habitual tasks in your app that could be useful outside of it.
Leverage New Capabilities: With the introduction of new large language models and Apple Intelligence, Siri is now more capable and flexible. By adopting App Intents, your app can benefit from these enhancements, including improved conversational capabilities and the ability to invoke items from your app's menus.
Utilize App Intent Domains: Apple has introduced app intent domains, which are collections of app intent-based APIs designed for specific functionalities. These domains include a broad set of new actions that support flexible voice interactions.

For more detailed guidance, you can refer to the session Bring your app to Siri (00:59) and Bring your app’s core features to users with App Intents (05:44) for understanding the framework.