D&D 5th Edition: Training

I was reading a thread on RPG.Net about DnD 5th Edition House Rules and I noticed that one I've been using for awhile wasn't listed. So, I've decided to share it here. I don't assume it's groundbreaking, but it's one I like.

My House Rule is thus:
I will allow a character Trained in a Skill or Tool to automatically succeed on a Skill check. This mostly depends on the situation the character is in, usually there is no direct threat or there is an important clue I want the player to find. 

As an optional rule, if two characters are trained in a Skill that would help in their current situation, even if there is a looming threat (but not in combat), if they work together, they will automatically succeed, as well.