Hello, nice to greet you.
According to the official documentation, which you can review through the following
link, a setup of 8 vCPUs, 8 GiB of RAM and 200 GB of storage is recommended for 100 agents.
Keep in mind that what will most impact the volume of agents is storage. For a number of agents greater than 100, a distributed scheme is recommended, in this case, you could have two nodes running with the setup indicated above, that way you could balance the load without problems.
Let me know if the information provided helped you.
Greetings
Nicolás