Agnosticism is just a qualifier that can be stuck on any theological belief that expresses uncertainty regarding our capacity to have knowledge about god(s). In a pantheistic context, I would generally interpret it in one of a few ways and ask the person to clarify:
1) The person is agnostic with respect to non-pantheistic concepts of god(s), particularly the culturally dominating classical monotheism.
2) The person is agnostic with respect to the human ability to know and understand reality/god(s)/universe/nature.
3) The person is not attached to using the word god(s) to describe reality/universe/nature.
I mean, I'm fundamentally agnostic on all questions of knowledge with respect to #2, whether I'm talking a theological view like pantheism or a science like chemistry. Humans have limits, and I don't make claims of Truth because of that.
1) The person is agnostic with respect to non-pantheistic concepts of god(s), particularly the culturally dominating classical monotheism.
2) The person is agnostic with respect to the human ability to know and understand reality/god(s)/universe/nature.
3) The person is not attached to using the word god(s) to describe reality/universe/nature.
I mean, I'm fundamentally agnostic on all questions of knowledge with respect to #2, whether I'm talking a theological view like pantheism or a science like chemistry. Humans have limits, and I don't make claims of Truth because of that.