There are certain protocols when querying an agent.
1. Agents will not expect that writers query one agent at a time, we will assume that writers are querying multiple agents. Do not send an email bcc:ing multiple agents! (This will do you no favours). When you are querying, do not send a generic letter “Dear Agent”, tailor your letter to an agent, show that you have done your research and that there is a reason you have chosen a particular agent to query.
2. Query only 1 agent within an agency. Agents talk to one another, and if there is a work that seems like a better fit for another agent, they will pass it on. If an agent feels that a work is promising enough for another agent, they will also pass it on. If you would like to query another agent at the agency, you should communicate this with the agent.
3. Follow the agent’s submission process. If the agent asks for a synopsis, send a synopsis; if they only accept email submissions, send in an email submissions. Remember that most agents receive dozens of submissions daily, so do not chase agents. (It’s never a good idea to phone or to pitch over the phone.)
4. If an agent has requested a full manuscript, this is a great sign. It can take time for an agent to read the full manuscript – they may be sharing it with colleagues to get a second opinion or they may just be deciding on your work. If you haven’t heard within 6 weeks of sending in your full manuscript, it would be fair to send a follow-up email.
If you have received an offer of representation from another agent, you should let agents that you are querying know. (This is particularly true if an agent has requested the full manuscript.)
5. If an agent gives you editorial feedback and works with you on your novel, then it’s not good form to query other agents. If you are querying other agents, be open with the agent working with you, if an agent is actively giving you his/her time, then it’s assumed that they will be representing you for the book. There’s no hard and fast rule on this, but it would be considered bad form to work with an agent and go through their editorial comments and then sign with another agent.