Now that I'm not on my phone, I can give a slightly more complete answer.
According to the tournament rules, only a deal for Treasure after winning the current combat is binding:
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Players who make an agreement about splitting treasure must follow the letter of that agreement after the combat, to the best of their ability to do so. Judges are encouraged to interpret vague wording to the benefit of the helper, so be specific! Neither the basic game rules nor the tournament rules enforce or regulate other deals made between players.
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That said, a player who goes into the game planning to make promises they do not intend to keep is a player who is probably not going to do very well in the game. There has to be SOME level of trust if you want folks to accept your help.