When you define node parameters, these parameters are stored in an extra file in the same directory the job chain is stored. When executing the job remotely with an agent, this file is not available. If you want to use node paramters for a step which is executed remotely, it is neccessary to have at least one lokal executed step with node parameters before. If you have no local step before, please add a dummy node before the remote node and assign one dummy parameter to this step.
You can download a example from here. Please change in the example configuration the process class to fit your environment.