Great question — answering as the UphillTech team:
In almost all of these situations that tip added to the CC slip is later split among employees involved in the service chain, so there is no need to tip the waiter/waitress that brings that food to the table. I would say the only factor that could sway this is the type of establishment and type of service received by the second staff member. If the only service performed is the bringing of the food and drink, that would not warrant additional tipping, however, if they continually fill your drinks and check on you, then it may. I think with these in mind, and the fact that it could vary depending on the location and restaurant type, intuition would be your best bet in determining the proper...
Full answer by justus95: https://travel.stackexchange.com/a/101787 (CC BY-SA 3.0).
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