From the Instapaper blog:
Improved Siri, Search, and Shortcuts Integrations
We’ve launched a number of “intents” that improve Instapaper’s integration with Siri, Search, and Shortcuts.
For instance, you can open your most recent article by saying “Hey Siri, Open Last Article in Instapaper”. You can open a folder by saying “Her Siri, Open Folder in Instapaper”, and then saying the folder name when prompted.
For a full list of actions available, open the Shortcuts app, go to the App Shortcuts section, and tap Instapaper.
Instapaper is one of the first apps I’ve seen to implement their App Intents setup the way I figured Apple intended – make both App Shortcuts and corresponding actions, not one or the other.
Some improvements though – generate the options for “Open Folder” based on what’s in the user’s library, including a Folder option in Add Link, add more clarity around the use case for Open Article, and update the older Get Bookmarks action to work with App Intents & use the predicate filtering capabilities.