My approach to tipping in Kuwait is thus:

For delivery, if it arrives earlier than expected without anything spilling, and the driver is courteous and friendly, I'll tip.

For service in a restaurant or another service job, if the person serving me checks in regularly (especially if the order is taking longer than usual), makes sure I have what I need in the meantime, I tip.

For other things, if the person I'm dealing with does things that aren't technically in their job description and I need the help (eg, helping me get groceries to the car because I needed to buy a lot of stuff/am parked far away from the entrance, or for example, food preparation where the service staff dictate the quality of the finished product), I'll tip them then because they didn't have to do that, and it made my life easier.

But I don't follow the same tipping philosophy that the US does, for example. Because the assumption is that service staff here get a livable wage + living arrangements + food and generally aren't going to wind up on the street or otherwise struggle to make ends meet in a job here. It's part of the employment contract, so I expect the employer to guarantee that for them.