Evidence of the ideas behind generative AI is not challenging to build, but the barrier between experimentation and production presents another group of concerns: repeatability, workflow predictability, safety, tracking, and scalability. The quality of the model is often not the bottleneck, and many teams find it challenging to apply GenAI into real systems and have enterprise-grade level guarantees. The Vertex AI Agent Builder offered by Google Cloud fills the gap with a managed infrastructure of deploying intelligent agents run on Gemini models, generation based on retrieval-augmented genera