Researchers built Vibe-GUIDE, a graph view inside a code editor, and tested it with 16 developers in a controlled experiment. The interface shows the agent's coding work as a connected graph of files and decisions. Developers could see what the agent touched, trace why it made each choice, and step in at any point. The study found that the graph view reduced the mental load of tracking what an agent has done across a large body of code. Developers said they felt more in control. They spotted problems earlier and redirected the agent before bad decisions compounded. The graph made the agent's reasoning readable without requiring the developer to read each line of generated code. For teams building developer tools with AI agents, the finding is direct: a visible work graph changes how developers behave. They review more, redirect sooner, and recover from mistakes faster. A flat chat transcript or a log file does not produce the same result. The spatial layout of the graph carries information that text alone cannot.