AGDD2Geo.Builders takes a vector of strings, so use muonAGDDTool.name() to add to this list instead of adding the tool itself which caused errors. Should the c++ code in https://acode-browser1.usatlas.bnl.gov/lxr/source/athena/DetectorDescription/AGDD/AGDD2GeoSvc/src/AGDD2GeoSvc.cxx be changed to make m_builders a tool handle array?