Google's Managed Agents API promises one-call deployment at the cost of execution layer control

At Google I/O, the company unveiled Managed Agents in its Gemini API — a service that promises to collapse weeks of agent deployment work into a single API call. It's also a sign that Google believes its ecosystem, including the newly launched Antigravity CLI, is ready to own the execution layer end-to-end. Before a single agent is written, teams are already spending days on the unglamorous work: standing up execution environments, managing sandboxes, wiring tool call infrastructure. Model providers like Anthropic have launched platforms to handle much of that work — but Google's approach is different. Google said in a blog post that Managed Agents in the Gemini API abstracts “away the complexity so that you can focus on your product experience and agent behavior.” The service is available in preview via new custom templates in Google AI Studio. The growth has introduced a real architectural question: should agent management live at the execution layer — embedded in the model or its ha