I think I need to post a Clippy FAQ. Will the LessWrong wiki be OK?

Once again, the paperclip must be able (counterfactually) to fasten several sheets together, and they must be standard thickness paper, not some newly invented special paper.

I understand that that specification doesn't completely remove ambiguity about minimum paperclip mass, and there are certainly "edge cases", but that should answer your questions about what is clearly not good enough.