Miarmy agent can interactive with Maya field not only from logic input channels, but also directly in dynamic simulation. When the agent dynamics enable, the agents can directly affect by Maya field. But please notice the field can only affect the bone which marked "fieldFeel". You need setup the "fieldFeel" flag on the bone shape of original agent. For reviewing the original agent and agent type, please refer Part 3 Agent Infrastructure
Mark "fieldFeel" on bones of original agent
Maya vortex field affecting dynamical agents
For fine tuning the dynamical result, you need just change the attributes in Maya field node itself.