This is not at probe per se but a wrapper to probes generated using other tools (scripts, collected, munin).
So it don't provides any probes and graphs, it's up to the user to write them.
There is only on parameter for this probe, the path to the rrd file.
So to use it, write a probe description that will use
jrds.probe.RRDToolProbe for the probeClass.
And then use it in your host :
<probe type="YouDesc"> <arg type="File" value="data/file.rrd" /> </probe>