There may be a valid reason to sign such an agreement without actually meaning it - to trick the opponent into believing you are not going to take any action so they fail to prepare and to mitigate your attack. In some cases this is the only chance.
Hmmm, I thought that if you sign an agreement... it does not matter whether you "mean it" or not. You signed it, so it has to have some meaning.
Or, can you back out of a signed agreement by saying "Oh, I did not mean it"?
Not an expert, but seems dubious/shady.
Your honour you see I signed it so I could trick them! It was super sneaky - anyway so since I signed it left handed I don't have to honour it right?