A toolbox contains a set of useful tools for artisans to use. A carpenter's toolbox has hammers, chisels, planes, etc. A plumber's toolbox has wrenches, nuts, pieces of pipe, etc.
A permaculture designer's toolbox contains tools useful for designing with permaculture. I have documented a few on this site. I have a physical toolbox.
My toolbox contains a brief description of almost every tool I have come across for designing systems. It also has entries for some solutions found in the wild.
The items in the toolbox are simple A6 sheets. To create the sheets, I cut an A4 into two A5's. Cut again they yield four A6 sheets.
On the top right I write the classification for the tool: (design) process, survey, analysis, design, implementation, facilitation, etc. I include the name of the tool and a short description of how to use the tool.