There is the mental category śāṭhya in Buddhism, a kind of dishonesty that is always bad.

There is 'allowed lying' within games, like the card game 'Cheat' (or B.S.), or social deduction games. The vow extends to these sorts of 'allowed deception' games - I won't play (or lie within) them.

There are cases like a trusted doctor lying to a patient as a last-resort to save their life, that can be beneficial. The vow extends to these cases - I won't lie even to spare lives. I think it's relatively more beneficial for me to set this extra commitment of honesty, though I don't think it's necessarily beneficial for others to take this sort of vow.

I gave Coyote permission to lie to me whenever he wants, because I trust him like that. This is from a personal view though, that he's an enlightened bodhisattva.