Most Helpful Guy
Personally, when I tell a girl she's "cool", it means her personality is positive on the surface and her interests are that of someone who is moderately driven and interesting. Could you consider that "friend zoning"? Maybe. That's not the worst place to be, because she can still convince me that she's a really special girl as we get familiar with one another. On the other hand, she can also prove to be intolerable beneath the surface.
It's a fine middle ground that isn't the end all, be all judgment. You're interesting, and I would like to get to know you more. That's pretty much what it means.1