Read the documents and sign them only if they describe the situation. If you have reason to believe that the invention is not novel, for example, then you shouldn't sign. If you don't believe that you took part in the invention, then don't sign. Etc.
Remember that it's not up to you to decide ultimate patentability. The application will start the process whereby a patent examiner tries to shoot down the claims by presenting prior art and/or by making arguments that the invention is obvious. It's an imperfect process, but at least it's (mostly) a level playing field.
Read the documents and sign them only if they describe the situation. If you have reason to believe that the invention is not novel, for example, then you shouldn't sign. If you don't believe that you took part in the invention, then don't sign. Etc. Remember that it's not up to you to decide ultimate patentability. The application will start the process whereby a patent examiner tries to shoot down the claims by presenting prior art and/or by making arguments that the invention is obvious. It's an imperfect process, but at least it's (mostly) a level playing field.