Why Prompt-Only Moderation Failed in My AI Generation App

When I first added moderation to my AI generation app, I treated it as a text problem. That seemed reasonable at the time. A user sends a prompt, I check the prompt, and if it looks unsafe, I block the request before it reaches the model. That approach worked for a very short time. It stopped working the moment I supported image inputs, reference images, and multiple generation flows. At that point, I realized something important: prompt-only moderation is not really moderation. It is just on...