Ten lessons from three years building agents for real production work

garrytan · x · 2026-09-11

Garry Tan shares an article, "Ten Lessons Learned From Three Years of Building Agents," from a five-person team that has built agents for real production work since November 2023.

The team's architecture changed substantially over three years; some changes worked, others produced expensive and painful lessons. The article walks through those mistakes—an engineering retrospective from front-line production agent builders with direct value for anyone designing agent architectures.

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