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But when I try to get parameters
rospy.get_param('/robot1/spawn/radius')
It raises KeyError: '/robot1/spawn/radius'

They are not shown in the rosparam list either.

that's because arg are not necessarily (ros)param.

args are arguments that get passed to the .launch file you include.

Whether they end up as parameters on the parameter server depends on what the included .launch file does with them.

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