Jedi Mind Trick is a technology that can be researched at the Jedi/Sith Temple in Tech Level 4. It costs 550 Nova, and gives Jedi/Sith Masters and Jedi Starfighters stealth. It is available to the Rebel Alliance, Republic, and Royal Naboo.
This technology lets Jedi Masters sneak past enemy units and Turrets to perform sneak attacks, before vanishing again. Note that they will become visible when they attack, and can always be spotted by detector units and structures.
"Knowing the Mind Trick grants Jedi and Sith the ability to conceal themselves from view, rendering them invisible to all but the most advanced sensor systems."