The phrase "to query an agent" means to send a formal letter or email to an agent, usually in the context of publishing or representation, to ask if they are interested in working with you. Full definition
What did surprise me was the astounding number of queries agents receive. (marketyourfiction.com)
They get the exact same kind of queries agents do and perform the same basic function of filtering out poorly written or badly edited books. (kindlenationdaily.com)
In the website itself you will be given conveniences of shopping online car insurance and for further queries agents will help. (blog.agentinsure.com)