Editing for your agent is a bit different then editing for yourself…sure, all the same principles apply, but there is one major difference; your agent is your lifeline to the publishing world.
This is why I stress finding an agent who has excellent editorial insight. My agent told me (as I’m sure they all do) that I can ignore suggestions as it’s my work. I did ignore a few things, but the truth is, I trust her judgment. She has a lot of experience in the publishing world and knows what makes a solid saleable work. If you and your agent don’t see eye to eye on your manuscript, this could create problems down the road.
I chose a highly editorial agent, who not only makes suggestions, but has an editor on staff. I could have gone with an agent who said my work was ready to submit as it was, but I’m glad I didn’t. Although it may have been polished, my novel wasn’t ready to be seen by publishers. I see that now and hope that at the end of this round of edits it is ready.