@DTS Engineer It works using the Shortcuts app as I mentioned in my post. In iOS 18.2 beta 2 & 3 I see new behaviour - it seems like the system is trying to load my intent when I use Siri (i.e. I see a loading animation on my text prompt “Search for in ”, previously it would simply open web search results) but it shows that loading animation for a few seconds and then simply fails and says ”Something went wrong”. In the debug logs in Xcode, I see: No ConnectionContext found for 12933943520 Identifier rank 4 should have been less than 4. If I remove this intent from my shortcuts provider, Siri reverts back to showing me web search results. I am not sure whether this intent needs to be in the shortcuts provider or not?

It's now available in beta 2. If you're looking to use it on an earlier version, I backported @Invalidating for older platforms and it effectively has the exact syntax, types, naming and functionality as the Apple's. You can find it here - https://github.com/theblixguy/Invalidating