If the gardener or pool man shows up to your house to do work on Shabbat, do you need to tell him to go home, or is it ok as long as you didn’t tell him to come on Shabbat אדעתא דנפשיה עביד?
The gardener is a problem. You need to tell him to come back. If he doesn’t listen that’s not your problem anymore.
Regarding the pool, do they do any Melachot?
Most probably
If they do, same. If they don’t and they’re being paid for the season, no problem.