How do you make your Agents to match interface in first try?

Hey, Problem: Interface between front and back never match at first try ! Setup: 4 agents in parallel: front, back, infra and debug Process: Vibespec the initial need and let's the agents work on their domain. I asked to created the interface document before starting but even though I does not worked as expected.. I am spending around 30 minutes to make it match ! How you guys are solving this issue ?