I used the following wording, as a Notice to Competitors, at two recent World Championships (Jury approved!):
"The course marks being used are autonomous and will promptly, and automatically, go back to its original position if hit or dragged by either yourself or a fellow competitor. Rule 31 continues to apply."

Here is language I used at a National championship last year:
 Marks 1, 1a, 2s, 2p are autonomous; these marks will go back to original position if they are dragged or otherwise moved

off station. Routine movement of autonomous marks will not be grounds for redress. This includes minor readjustments

and marks returning to station after having been pushed or dragged away by a competitor.

I like that wording, but wonder why you didn't add "RRS 31 continues to apply"

I'm confused by the need for this at all.  Marks move around all the time based on wind, waves, current and, especially, after being hit by a competitor.  The amount a mark might move is dependent on things like the amount of scope on the anchor line, how hard it was hit, etc.  Having judged and umpired events using autonomous marks, including as starting marks, I have not found them to be any more or less susceptible to movement than anchored marks.  It is the sailor's responsibility to make sure they leave sufficient room for movement of the mark.  About the most you might need to do is include that the marks are autonomous in the description of the mark.

SAMPLE from 2023 Thistle Class Midwinter East SI:
9. MARKS
9.1. Marks W and O will be an orange tetrahedron and an orange ball, respectively. Marks LS LP (gate marks) will be yellow MarkSetBots, and R will be a large Orange inflatable. The finish pin will be a Green MarkSetBot. If the weather mark changes, the new mark will be a Yellow tetrahedron, and an orange ball for the offset mark.
11. CHANGING THE NEXT LEG OF THE COURSE
11.1. To change the next leg of the course, the race committee will change the position of the next mark as soon as practicable per RRS 33.
11.2. The gate angle may be adjusted without making any signals. This changes RRS RACE SIGNALS.
11.3. The race committee can change a mark by up to 10 degrees or .1 nm without signaling a change. Such change will be announced over VHF 72. This changes RRS 33.

From a recent Viper 640 event in Sarasota (I did not attend)

Regarding whether additional info is necessary... I agree it's not strictly necessary, but at minimum saying they are bots, or letting people know they might move back into position after being dragged is probably helpful for the fleet as we first start to see this type of equipment. I'd argue the value is more than the alternate value of a shorter SI, but that's up for debate.

I agree, saying they are MarkSetBots in the description, like saying they are cones, balls, etc., and the color tells the sailors what they need to look for.  It is a good way of describing them.  To tell the sailors that rule 31 still applies seems unnecessary to me.  FWIW - people are making these for RC sailing:

Just a comment/opinion - I hope that one day RRS will be more sensible and allow boats to touch marks without penalty, like in the 18s on Sydney Harbour. When you consider that a mark is usually only an arbitrary position in the water because it can move metres according to wind or tide. Collisions occur when boats alter course to avoid touching a mark at the last moment.

Perhaps a conversation for another thread.  There are definitely pros and cons.  Should someone be able to force you to hit a mark?  What if the mark is a government buoy?  What if hitting the mark can cause damage to the boat or mark?  Lots to think about.

When I was racing in SF Bay, many of the races used gov marks. Bad plan to hit one. Best not to tinker with a good rule.

Thank you all. Very helpful.