How secure is the peace deal between the US and Iran?

The United Nations has welcomed the peace deal between the U-S and Iran, acknowledging that the agreement represents a critical step towards the peaceful settlement of the conflict. But Israeli Prime Minister Benjamin Netanyahu has distanced his government from the peace deal, saying he respects the decision but will continue to protect his own country's interests by taking action against Hezbollah in Lebanon. The peace deal depends on a ceasefire on all fronts of the war - which includes Lebanon. So how secure is the deal?