In your mods folder ["MyMod"] there is a file called ModDescription.xml. It is this file that triggers the use-mods directory tool to list MyMod as an option. And it goes like this:
< ?xml version="1.0" encoding="UTF-8" standalone="yes"? >
< GC2Mods >
< GenericMods >
< Description >My New Mod< /Description >
< /GenericMods >
< /GC2Mods >
(BTW, the example mod does not have a closing < /GC2Mods > tag)
What is the significance of the 'GenericMods' tag?