What is the ruling on a Mudarabah contract which stipulates that the capital provider leaves the determination of the profit share to the agent, with mutual consent and the signing of the contract between the two parties?

For the validity of the Mudarabah contract, it is a condition to know the share of profit for both the capital provider and the Mudarib (investing partner), because uncertainty regarding the portion each will receive invalidates the Mudarabah contract.