flamethrower49 if you're reading this, get out of here =p.
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"Deity" being in quotes because it says a Deity or agents thereof... I'm confused about exactly what I can learn via the Commune spell, mostly because I'm not sure exactly how much knowledge deities have in Golarion.
The situation is thus. My L15 cleric of Sarenrae recently had a strange Dream/Vision. He wants to know more about it, so is considering casting the Commune spell. Would I be able to find out, for example, who sent the vision, assuming it was not Sarenrae or her agents? I realize it is a yes/no question, but I do have some idea. My question is this, if I ask:
"Agents of Sarenrae, was this vision sent to me by Sorcerer Bob?"
Is that something agents of Sarenrae would be able to answer? Assuming that Sorcerer Bob did in fact send me the vision, would they know that this was the case? It seems like it would be something they'd need to know off hand, not something they have the power to find out. The spell only lasts rounds/level.
What if I ask about the specific contents of my dream? "Agents of Sarenrae, is the Elven woman I saw in my dream still alive?" Do said Agents have any idea what was in my dream, as I presume, it was something sent only to me?
Explain with as much detail as you are able, ty.
You would have more luck casting Divination for the knowing who sent the vision as the reply can be a sentence. In general, multiple castings of divination tends to be better than commune unless you have a bunch of questions that could be answered with a yes/no.
Also keep in mind that all divining spells are heavily subject to DM fiat. It'll work if the DM wants it to, it won't work if he doesn't want it to, or he'll just have it be cryptic as heck.
Deities generally know anything they want to know.
Their agents might now significantly less, however. It's really up to you.
Personally, if they're going to the trouble of casting Commune and wording their questions carefully enough to get the proper answers, I'll give it to them.