I did a full live build showing how to actually use Claude Code Agent Teams the right way—because if you just throw a vague prompt at a team, you’re going to get a mess. Agent Teams are different from sub-agents: they run in parallel, share a task list, and they can communicate with each other while they work. That coordination is the whole point, and it’s also why this feels like where agentic engineering is headed. In the stream, I take an existing agentic chat app and integrate Chargebee token billing end-to-end. I walk through my brownfield workflow: start with a prime so the agent truly understands the codebase, then force a heavy Q&A phase to reduce assumptions (my #1 goal in planning), then formalize everything into a structured implementation plan. After that, I send the plan into a 3-agent team to implement backend, frontend, and database work in parallel—plus I show a contract-first approach for reliability. Finally, I validate the whole thing with end-to-end browser automation using the Vercel Agent Browser CLI, so the system can self-test purchase flows, token deduction, and edge cases before handing control back to me. Agent Teams are still experimental, token-heavy, and non-deterministic—but you’ll see how to make them usable today with the right structure and validation.