I mean primarily in-house productions like Fate/Tsukihime as opposed to adaptations like the HF movies and licensed works like the Prototype prequel and FGO. Not to say that it has to be exclusively full-time employees, just that there's a big difference between Tsukihime 2 using an outside artist and a spin-off novel written by a random freelancer under the supervision of Nasu for an outside publishing house.
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In other words, it has to be a Type-Moon company production and not just a licensed product made by other people/companies with input from Nasu and an "original designs by" credit for Takeuchi.