When Should Cofounders Reopen the Agreement?

Two cofounders can still care about the same venture while wanting different levels of involvement, risk, or time commitment. The difficult part is deciding what can change independently and what affects a promise they made together.

What helps cofounders renegotiate a commitment without turning the conversation into a test of loyalty? Is it enough to name what has changed and what each person can still offer, or do you also need to revisit who owns which decisions?