What does a literary agent actually do?
Represents an author to publishers, negotiates on their behalf, and manages the commercial side of a writing career — and in most of trade publishing, they are the only route in.
Why they exist as gatekeepers. Major publishers receive far more submissions than they can read and rely on agents to filter. Most do not accept unagented submissions at all, which means for a great deal of fiction and general non-fiction, getting an agent is the necessary first step.
What they do:
Editorial work before submission. Many agents work substantially on a manuscript before showing it to anyone — frequently several rounds. This is unpaid at that stage and is one of the more valuable things they provide.
Submission strategy. Knowing which editor at which imprint is looking for what, and pitching accordingly. This is relationship knowledge that is genuinely not available from outside.
Negotiating the deal — advance, royalty rates, escalators and payment schedule.
Managing rights, which is where agents frequently earn their commission several times over. Translation, audio, film and television, serial and territorial rights can be sold separately, and a good agent retains and sells them rather than letting a publisher acquire everything.
Contract scrutiny — reversion clauses, option clauses on your next book, and what happens if a book goes out of print.
Career management across multiple books and publishers, and chasing payments.
How they are paid. Commission, conventionally around 15% of domestic earnings and higher on foreign and film rights where a sub-agent is involved. They are paid only when you are.
The warning sign, stated plainly: a legitimate agent does not charge reading fees, submission fees or editing fees. Any request for money upfront is the clearest indicator of a disreputable operation, and the practice is prohibited by professional association codes.
How to find one: research who represents books like yours, follow submission guidelines exactly, and send a query letter with the material requested. Rejection rates are extremely high and largely impersonal.
You do not always need one — some non-fiction, academic, regional and self-publishing routes work without.