[outofpaper]

A harness is a collection of stubs and drivers configured to assist with automation or testing. It's a standard term often used in QA as they've been automating things for ages before Gen Ai came on to the scene.

[arcanemachiner]

Yes, it is also a device used to control the movement of work animals, which farmers have been using for ages before QA came on to the scene.

[squeefers]

its technically an IDE, but harness makes it sound new and fancy.