Meta built Forum, a standalone Facebook Groups app, using an AI agent integrated into the engineering process. The company says a small team developed the app from scratch, measuring success by verified, production-ready outcomes rather than code volume. Meta describes a "human-on-the-loop" model where agents plan, implement, test, and correct while engineers supervise and approve results. Supporting capabilities include automated verification, simulated user testing with navigation agents, and agentic production operations after launch.
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