I want to know the answer to the following question:
The failure of the agreement lead to what?
All the background I'm provided with is that "The rebel barons suspected that the proposed baronial council would be unacceptable to John and that he would challenge the legality of the charter; they packed the baronial council with their own hardliners and refused to demobilise their forces or surrender London as agreed.". Is that enough to answer the question?
Answer: no