Meta says an AI agent helped build its new Forum app to feature parity with Facebook Groups in 8 weeks
Meta_Engineers · x · 2026-11-11
Meta engineers detailed how they built Forum, the company's new standalone Groups app, with an AI agent as a full participant in the dev cycle.
- The team shifted from human-in-the-loop (engineer drives, AI assists) to human-on-the-loop: the agent autonomously runs plan → implement → build → test → correct loops, while engineers set goals, monitor, and own outcomes.
- Success was measured not by code volume but by changes that build, pass tests, and survive review.
- Forum reached core feature parity with Facebook Groups in 8 weeks.
- An autonomous stress-testing loop caught a memory issue during development, roughly halving memory use and page faults.
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