Tier 3 is an upcoming mod for Portal and Portal 2, it will take place in the year or so before Portal. Kat, the main character, is an elite test subject raised for the sole purpose of being the perfect test subject. Over her many years of testing, she has exhibited the kind of behavior GLaDOS hoped for. However, the Aperture Science Handheld Portal Device is nearly finished and Kat yearns to see the outside. After all, GLaDOS won't need her after she can finish the ASHPD, right?
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...but you have the GLaDoS potato, yet this is supposedly before or after Portal 2. I take it that it has to be an accident?
Yes, it is an accident. Couldn't get rid of it for some reason.
Open a instance of starting (I don't remember how it is called) and delete in 1 entity checkbox - potatoegun
Just remodel the Potato to look like a camera that watches you very carefully. Once GLaDOS gets suspicious of you, she should take your Portal Gun and attach a camera to it.