It looks like Apple's plan is to enable something similar to Android's intent URIs: "To work with Siri, the third-party apps will need some kind of search-quer

It looks like Apple's plan is to enable something similar to Android's intent URIs: "To work with Siri, the third-party apps will need some kind of search-query box that Siri could fill with the user’s verbal request once the app is accessed. It’s unclear what would happen if an iPhone or Apple Watch owner had multiple apps that did the same thing, like Uber and Lyft, and then asked Siri to “book me a ride home.” (Don’t bother asking Siri to book an Uber ride today; the results are typically terrible.)"