In a single week, every layer of the AI agent stack advanced simultaneously: Microsoft shipped Agent 365 as an enterprise control plane for governing fleets of AI agents, Google open-sourced ADK for TypeScript so web developers can build multi-agent systems, Meta acquired a social network where agents talk to each other, and Mandiant's founder raised $190M to build autonomous security agents. For product builders, the signal is unmistakable — agents have crossed from prototype to platform, and the race to define how they're built, deployed, managed, and secured is happening right now.