ToME: the Tales of Maj'Eyal

Silent Blade claims to be able to hit people without breaking stealth, on a simple, normal attack.

This doesn't seem to be true. I haven't noticed any difference between it and any other knives for the rate of breaking stealth, and on testing, I've seen it repeatedly break Stealth when I attack with only it.

I may be misunderstanding how it works, but I don't think so, the description doesn't sound unclear, and it seems to be breaking stealth about the normal, expected amount for my level of Unseen Actions...

the big issue with it is that if you are wielding another knife (and you always will be) the other knife will hit and break stealth.