tl;dr: NVIDIA has open-sourced Auto-Ontology, a service that sits next to enterprise databases and compiles their metadata into a semantic ontology—mapping business terms to columns, reviewed SQL measures, and table relationships—so agents can generate more accurate SQL instead of guessing from raw schemas stuffed into context windows. It exposes this context via MCP, REST, and agent skills, includes an answerability check to reduce confident-but-wrong responses, and ships with an eval harness benchmarking against BIRD, BEAVER, and others. It runs via Docker Compose, supports 10 database engines, and defaults to NVIDIA NIM models but works with any OpenAI-compatible endpoint.