Most teams start building agents the same way they build any other web feature: wrap the model in a route handler, parse the request, and wait for the response. This is fine for a demo. It's also the first thing to break in production. Agents are long-running, stateful, and non-deterministic. They call tools, wait for external APIs, branch into subtasks, hit rate limits, and crash halfway through multi-step sequences. If your agent is tied to a single HTTP request, you've coupled your applicatio...