When Agents Test Other AgentsAugust 16, 2026 · 12 min readLi JinDora SSR developerI recently ran an experiment that sounds unnecessarily circular. Codex acted as a user: it proposed games, sent multi-turn requests, inspected the results, and asked for changes. Dora Agent acted as the developer. Across dozens of games, the work became more than a gallery. Codex summarized repeated failures and used them to improve Dora Agent itself. The games changed, and so did the software making them.