How's this build for a stealth playthrough with guns and traps?
Which gun? This is important. Different gun have different STR requirements and different feats with different requirements. 5 STR for sniper rifles, at least 6 for assault rifles (7 if you want a feat for better bursts, 8 if you want to wear metal armor). Pistols and SMGs don't have a STR requirement at all, so you can dump it all the way to 3. Unless you want better bursts with SMGs or to wear metal armors. But you probably don't want to wear metal armors, since they are pretty bad for sneaking around, with one exception.
ST: 8
Dex: 6
Ag: 8
Con: 3
Per: 9
Will: 3
Int: 3
This is mostly alright. STR is definitely too high if you don't plan to use metal armors. Enough STR to use what you want, 3 WIL, at least 5 INT if you want to craft at a good pace (or 6 or 7, if you want any of the crafting feats). I'm not a fan of being a total glass cannon so I usually go with at least 5 CON, but plenty of people go with 3 and manage. DEX largerly depends on the weapon used - it's pretty much useless for ARs unless you need it for feats, very useful for pistols and SMGs since it reduces their AP cost, technically useless for sniper rifles but you will want a pistol/SMG as a backup. As for AGI, that depends entirely on what feats and if you care about having high dodge and/or evasion.
also, will i get locked out of convos because of low int? So far it doesn't seem like to be the case.
You will miss a few things, but it's mostly flavour.