I think the Planar Ally spell comes the summoned being to at least begin negiotations, and keeps them to the agreement and not killing you.Actually, the 9th-level Gate spell resembles Planar Ally. A planar creature shows up to negotiate. A deal may or may not happen.
Gate on the other hand offers you not even that modest protect, its technically more powerful, heck if you catch a deity visiting another plane where it can't block your gate spell, and you know its name, you can compel the deity through the Gate. Of course at that point you die, slaughtered by the angry God.
And Gate isn't limited by type of creature, you could summon a Kraken say, or a Nymph, or a Dragon or a Lich from another plane. But you gain neither control nor safety from what you summon.