Detect Traps

For the duration, you sense the presence of traps within 30 feet of you. If you sense traps in this way, you can use your action to see a faint red aura around the trigger for that trap if it is in view. I.e. the surface a glyph of warding is cast on, the cover of a pit fall trap, a hidden foot pedal in the floor, etc. This spell merely reveals that a trap is present, and if visible, the trigger mechanism, it does not reveal the location or nature of the trap itself. I.e a footswitch for flamethrowers or a fragile cover intentionally designed to break for a pit fall trap; both would have an aura you could see, but not the flamethrower nozzles in the wall or spikes underneath the fake floor.

A trap, for the purpose of this spell, generally refers to anything constructed/set/enchanted that would inflict a sudden or unexpected effect you consider harmful or undesirable, which was specifically intended as such by its creator. Thus, the spell would detect an area affected by the alarm spell, a glyph of warding, or a mechanical pit trap, but it would not reveal a natural weakness in the floor, an unstable ceiling, or a hidden sinkhole.