This paper focuses on automatically generating informative ad descriptions in sponsored search. Unlike ad titles which are usually optimized to attract user click feedbacks, ad descriptions have a longer text span and possess the potential of incorporating world knowledge to address user search intents while presenting the fine-grained selling points of the ads. We propose Interactor, a multi-turn iterative creation framework optimized with agentic RL for ad description generation. The generation model acts as a policy that interacts with a customized environment consisting of multiple generative reward models. Given initial generations by the policy, the customized GenRMs evaluate qualities including knowledge capacity and landing page consistency, providing both binary signals and detailed feedbacks. The policy then iteratively refines the descriptions based on such feedbacks to ensure continuous improvement. Experiments show that it significantly outperforms state-of-the-art ad text generation approaches in generating knowledge-rich and faithful ad descriptions. Since late May 2026, it has been deployed online in a leading search ads system, where the framework serves over 140k advertisers, contributing to both ad revenue and user experience.

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