2 years ago: Fillet curve at parameter is un-grasshopper-y - #4 by Harri_Lewis
magicteddy code seems better though, more elaborated… haven’t tested.
… mine was a cheap hack over nodeincode without checks and warning messages.
@magicteddy with the icon, is that a plugin with your code? or you pushed the bitmap to the c# script?
I sometime do the second, but it’s tricky and cumbersome…