It's a negative embedding, so the negative prompt.

In the context of embeddings, if it says "neg" or "negative" anywhere then you're safe to assume it goes into the negative prompt. For instance in the title of this embed model it's "SkinPerfection_Neg" letting you know that it goes in the negative. In the description it says "Use this negative embedding to dial in more skin texture and character.", and "Only uses 5 tokens so as not to flood your negative token space."

Hope that helps.

When i'm not sure if an embed model is a positive or negative I do these steps:

① Double check the model page to see if there is any mention of it in the title, description, trigger word, or the "About this version" dropdown that I missed.

② Look through the images in the gallery of the model to see their generation parameters. Civitai only supports automatically grabbing generation data from specific generation tools, meaning sometimes its blank.

③ Look through the discussion section, both the initial questions AND the replies (the little 💬 button on the discussion) to see if any other user has the info I need.

④ Just try it out in the negative and then in the positive, using the same generation parameters I can compare the results to see which looks better.

Hugging Face has an embedding converter online,