So, simple question to clear up my doubt.
Feral Mutagent gives 1x bite and 2x claws.
So a single attack could be bite(1d8) or claw/claw(1d6/1d6).
A full round attack would be bite/claw/claw(1d8/1d6/1d6).
The way it is in the APG I am unsure if the claws deliver 1d6 or 1d6/1d6 as an animal would. I assume the latter option.