Near Livermore here are two recommendations:
Blossom Bee in Dublin. It is near the intersection of 580 and 680. Fabulous gluten free crepes! Loved the chicken pesto and one with beef. Great honey mustard dressing on the salad that comes with it. They prepare the gluten free crepes in a separate pan so no cross contamination issues. Love them!
Eddie Papa's in Pleasanton.
Their gluten free reviews were great and the food I had there was fabulous. Oddly enough I had to push a bit for the lady who seemed like a maitre'd to ask for something other than sandwiches to make a gluten free dish. Their chef, however, knew what he was doing and I had a fabulous Fog City Tetrazzini Pasta. On another visit I had the Castro Artichoke Soup. Also fabulous. The first lady I delt with, I didn't understand why she was so odd, maybe confused or unknowledgable but tried to tell me they couldn't make cream sause without flour. I just gave her a look and she went to ask which of course the chef said no problem. The reviews all indicated there should be no such problem with this restaurant which is why I pushed. Usually I would just leave with that amount of pushback but was very glad I stayed. They give you a big cup of cotton candy with your check for free. Very unusual and kind of fun.