The API of GlyphsToolOther?

Scripting
1

I want to use

GlyphsToolOther.cutPathsInLayer_forPoint_endPoint_(self, Point1, Point2)

in OC.,I declared my interface

@interface GlyphsToolOther : GlyphsPathPlugin
-(void)cutPathsInLayer:(GSLayer *)layer forPoint:(NSPoint)p1 endPoint:(NSPoint)p2;
@end

, and I obtained the throught ergodic doc.windowController.toolInstances that GlyphsPathPlugin.className=‘GlyphsToolOther’
but when I do

 [otherTool cutPathsInLayer:layer forPoint:node0.position endPoint:node1.position];

it tell me -[GlyphsToolOther cutPathsInLayer:forPoint:endPoint:]: unrecognized selector sent to instance .
it run in python

GlyphsToolOther = NSClassFromString("GlyphsToolOther")
GlyphsToolOther.cutPathsInLayer_forPoint_endPoint_(Layer, node0.position,node1.position)

Which link did I have a problem？

2 
@interface GlyphsToolOther : GlyphsPathPlugin
+ (void)cutPathsInLayer:(GSLayer *)layer forPoint:(NSPoint)p1 endPoint:(NSPoint)p2;
@end

Class otherToolClass = NSClassFromString(GlyphsToolOther);
[otherToolClass cutPathsInLayer:layer forPoint:node0.position endPoint:node1.position];
3

Thank you very much. I got a knowledge from you again.