Like Salt, Ansible is another configuration management system. However, Ansible does not have a custom agent: it always works with SSH. Unlike the way Salt works with SSH, where it spins up an ad hoc minion and sends it commands, Ansible calculates the commands on the server and sends simple commands and files through the SSH connection.
By default, Ansible will try to use the local SSH command as the control machine. If the local command is unsuitable for any reason, Ansible will fall back to using the Paramiko library.