Right now, it only sends a status message to Laconi.ca when the post is first published. At that time, it adds a value to the post’s metadata so if you save the published post, it sees it already sent it and does not do so again.
I could certainly enhance it in the future to send status messages to notify a published post has changed. I could see making that configurable, too. It seems a bit complex, though, both in the configuration and the use. Most similar tools seem to follow the same behavior, send on first publish, then ignore any subsequent changes so that seemed like the most consistent and predictable behavior for Laconica Tools.