Auto Ontology MCP

Quick start · Demo · Knowledge base · Tools · How it works · Safety

Auto Ontology MCP (auto-ontology-mcp) brings NVIDIA Auto Ontology's semantic layer to any MCP client, for two jobs:

• Ask your databases. Point it at a database, and the model you already use (Claude Code, Codex, OpenClaw, Hermes Agent, Cursor, VS Code, or the Claude and ChatGPT apps) builds business Terms, reviews joins and answers questions with SQL that the server checks against the ontology and the data.
• Keep a personal knowledge base. Share receipts, statements, papers, book notes or screenshots with your assistant; it reads them and stores the facts as records, the ideas as linked concepts, the passages worth finding again in a full-text index, and where each came from. The full originals stay in your Obsidian vault. Later questions get exact numbers, searchable quotes and links back to the original.

[!TIP] Use it in place of an LLM Wiki. In Karpathy's LLM Wiki pattern the model compiles your sources into markdown pages that you read in Obsidian. Auto Ontology MCP runs the same loop (ingest, query, lint, with an index and a log) on an ontology instead of loose pages: facts go into typed tables you can sum, filter and compare with SQL, ideas become concept pages with typed links, every record, page and link keeps its source and the quote behind it, and export_wiki writes it all out as an Obsidian vault with aliases, [[links]] and the graph view. How the two map

Auto Ontology runs its own LLMs (NVIDIA NIM) behind a Next.js, FastAPI and Postgres stack. This project hands every language step (reading, extracting, naming, judging, writing SQL) to the model in your MCP client, so there is no model endpoint to host and no API key to configure. The server keeps the deterministic work: schema extraction, profiling, key inference, validation, storage and read-only execution, in local SQLite files.

Why

Text-to-SQL fails quietly. The query runs, a number comes back, and nothing says it is wrong.

... View full README on GitHub