Somewhere along the way I added some support into the IDE for recognizing / launching "tel://" URLs, which if you're on modern macOS will launch in FaceTime ready to dial the URL's number (actually it comes up in notifications where you can confirm to dial).
Apparently sms:// are a thing, and they're supported by the Messages app on macOS.
SMS URL's look like this:
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sms://123-456-7890&body="HelloWorld"