It’s getting easier to run two agent sessions in parallel over the same codebase. Avoiding them from making inconsistent assumptions, not so much.

My observations: parallel sessions acting on adjacent subsystems won't stay aligned without a common constraint set. The session that assumes the auth invariant will not know that another session just changed a constraint it relies on. The clash won’t manifest at commit time; it will occur at integration time, when the false assumption has already been propagated to three other files.

No approach feels entirely satisfactory. What works for you?