Question about custody

I currently have a signed custody agreement through the courts granting me full custody of my child. and i am not divorced yet

my question is if i reconcile with my ex to attempt another try for marriage, and it doesnt work out again and results in a separation again. will the currently signed agreement still be valid or would a new one have to be signed all over again?

THanks

If you reconcile for a long period of time, custody will need to be reevaluated if and when you separate again.