Most Databricks agent tutorials start with "set up Unity Catalog and Vector Search first."

This one doesn't. I built a fully working conversational agent using only samples.tpch — the dataset that ships in every Databricks workspace by default. No custom tables, no Vector Search index, no catalog setup.

The stack:

OpenAI Agents SDK (with AsyncOpenAI — important, sync breaks it)

Databricks Model Serving (Llama 3.3 70B via OpenAI-compatible endpoint)