Newly agented questions

I have 2 "newbie" questions. (Newbie to having an agent, not newbie to AW.)

First, can I mention my agent on my writing Web site. Right now, I state that if a pub/editor wants to contact me, to do so and I will direct them to my agent. Is that sufficient?

Second, yesterday I was interviewing a person who is an esteemed expert in her field for an article that I'm writing and planning to query about. During our conversation, it came up that she is writing a book, and asked if I'd contribute a personal story to it. From the conversation that we had, it really sounds like a quid pro quo arrangement, but should I let my agent know? Does she need to go through him, even though there is no payment involved? I know writing for free seems absurd, but to be included as a voice in her book would be 1. incredible for my platform, espeically for my other WIP that happens to be tangentally related to her book subject and 2.--well, there is no "2" aside from my own personal hero worship of this person.

TIA for any help anyone can provide!

forgot to subscribe to post.

everything? Even articles and such? What if this project really isn't an anthology?(Sorry if I'm being vague, I don't want to give info out about someone else's WIP, kwim?)

Thanks Orion! Now that you explained the "everything" part, it makes sense to me.
So, agents are okay with what I'm going to call "unassisted publications" like articles, since they help build platform?

Forgive the questions that may just seem dumb--but so much has happened so quickly for me, and I'm still trying to wrap my brain around being newly agented. LOL