That's covered in the DMG. You don't ask for a check for ordering a drink or to walk across the floor. Of course you don't normally ask for a check for mundane tasks. Unless it's my Halloween episode in which case I'm using a wide variety of things to make my players paranoid.
I'm aware of what's in the DMG.
I was asking about what you do, since you said you "require an appropriate check" which seemed to be in contrast to your summary of
@Charlaquin's gameplay in which “In some cases you determine their actions will have no chance of failure”. The implication seemed to have been that you never determine actions to have no chance of failure and always test them with an “appropriate” check. I had assumed that by
appropriate you had meant something like “using an ability and/or proficiency that corresponds to the fiction in some way”, but perhaps the concept of appropriateness being used also extends to checks only being suitable when nontrivial actions are declared, in which case my example would be a poor one. Notice, however, that in @Charlaquin’s method, a distinction between trivial and nontrivial actions is not needed. The DM simply decides whether the declared action could fail and if that failure would have meaningful consequences. Actions that might be deemed trivial probably wouldn’t meet those criteria, so no check would be called for.
To go back to
@Charlaquin's example, an action was attempted "to try to disarm this trap by wedging something (I no longer remember what, maybe it was a dagger or something) through the seam to hold the lever in place while they opened the door, which I determined would succeed without need of a roll." Presumably, this was a nontrivial action insofar as disarming the alarm system was important for the party's plan to open the door without setting off the bell and as the prospect of inserting an object through the door-gap with sufficient force and positioning as to immobilize the lever doesn't sound (to me) like something that could be relied on to succeed on the first try. Multiple attempts may have had to have been made, and yet, the mechanism having already been noticed, and the possible existence of other factors such as an absence of time pressure (so no negative repercussions for repeated attempts), the DM decided to describe the success of this (nontrivial) action.
Now, you as DM might have called for a check in this situation, having a particular DC in mind for the disarming of the door alarm, but my question is do the players in your games ever have their characters attempt a nontrivial, non-mundane action in the fiction for which you don't feel a check is an appropriate way to resolve?