If they are doing gardening for you then why not use your tools? Unless they have a company van to bring all they need to do the job!
Can't you pop out to the shed, you know when it is not raining, and stick a polite notice to your barrow to say it needs repairs so please do not use!
If you would like them to stop using certain tools, then lock them away somewhere!!
As for cleaners, well I used to be a 'keyhole cleaner' where I'd have keys to customers homes and I'd go to their houses and use their cleaning stuff. If the hoover was full, I'd take the initiative and empty it. If they needed new cloths or more cleaning stuff, I'd leave a note to say so. It wasn't rocket science!
Oh, and I didn't then & nor do I now drive, so carrying around a whole tonne of cleaning supplies and hoover would have been impossible!!!
If you expected the gardeners to come fully equipped you should have told them so, but I expect that would cost you more money!!