When an AI agent leaks data, it may not look like a breach at first. It may look like a normal tool call, a helpful API request, or a browser fetch that quietly sends the wrong payload to the wrong place. That is the uncomfortable part for builders: prompt safety can warn you about intent, but only the network boundary can stop bytes from leaving. If your product lets agents call APIs, browse pages, use MCP tools, fetch files, or run long workflows, you need a simple rule: agents should no...