Agreeable Gray is a greige that DOES get a wee bit tipsy towards gray, to the point that in some rooms (particularly north-facing rooms) it can even cast a bit gray-blue. Crazy, but true. However, even when it does pick up that cool vibe, it's very passive.

Why does agreeable gray look blue in my house?

Let's keep in mind that in cooler lighting situations AG is going to look cooler. All grays (warm and cool) have 3 undertones, blue, green, or purple which means there is always a chance that these undertones will show up in the right lighting. I've seen Agreeable Gray look almost blue in some rooms.

Why does my GREY wall look blue?

If your room is North-facing, it will have more gray light with slight blue cast. This means any gray paint you select will look more blue. Simultaneous contrast – the affect of colors against one another. ... In contrast with your your brown wood, it might look even more blue.