[Xymon] alert script environment variable for URL of test?

Seems to me it'd be nice if an alert script got an environment variable with the URL of the test that failed or recovered. Scenario: recipient(s) has/have smartphone, so they can click on a URL in a text message. Even if their access is sporadic, the text of the URL contains the host and service affected, so they have much of what they'd need right there; the message is short, while still leading to the full web presentation.

I don't see any way to do that with the existing setup, save by assuming the URL has a site-specific format and plugging in the host and test names appropriately.