While it is common to list the Registered Agent in your Operating Agreement, the exact requirements vary depending on your state and local jurisdiction, as well as the particular needs of your business.
The Registered Agent is the person or entity designated to receive legal and official documents on behalf of the LLC, such as legal notices or tax forms. When the Registered Agent is someone else other than the members or managers, you will typically want to include the Agent in your Operating Agreement.
Again, the specific requirements for Operating Agreements and other legal documentation can vary based on your jurisdiction. To ensure compliance with local laws and to address the particular needs of your business, Ask a Lawyer.
Rocket Lawyer can act as your Registered Agent or specify your Registered Agent when you register your LLC.