The abilities are named "AI Tag 01", with leading 0s for the numbers below 10. Case is also very important, for all abilities. There are 20 possible AI Tags to use. Look in Abilities.txt to see all abilities that can be added to ships, components, facilities, planets, etc.
SEnet ModWorks provides a tutorial detailing how the AI chooses which component to add to a ship design or which facility to build (it is the same process):
http://www.spaceempires.net/home/ftopict-448.html
Incidentally, chapter 16 of
SEIV Modding 101 provides a more detailed overview of all abilities, including which files they can be used in.