Although to be honest, I've never played with something like that and I tend to think of such tools as unnecessary, provided that there is good communication between playes (including the GM).
Still to be honest, I never do, but that's mainly because I have a tightly knit group of players and I know what they want.
Although in the past I have one a few occasions, maximised "bleed", for the purpose of emotionally engaging my players. I believe this is probably a no-no nowadays.
This is an issue that can crop up often in games. For future reference you might want to check out safety tools like the X card:
https://docs.google.com/document/d/1SB0jsx34bWHZWbnNIVVuMjhD...
Although to be honest, I've never played with something like that and I tend to think of such tools as unnecessary, provided that there is good communication between playes (including the GM).