{"repo":"fabio-rovai/open-ontologies","free":true,"listed":false,"github":"https://github.com/fabio-rovai/open-ontologies","clone":"git clone https://github.com/fabio-rovai/open-ontologies.git","description":"AI-native ontology engine: a Rust MCP server with tools for building, validating, querying, and reasoning over RDF/OWL ontologies. In-memory Oxigraph triple store, native OWL2-DL tableaux reasoner, SHACL validation, SPARQL, versioning. Single binary, no JVM.","language":"Rust","stars":421,"topics":["ai-native","claude","description-logics","knowledge-graph","linked-data","mcp","mcp-server","ontology","owl","owl2"],"license":"MIT","category":"mcp-servers","readme_excerpt":"Open Ontologies A Terraforming MCP for Knowledge Graphs Validate, classify, and govern AI-generated ontologies. Written in Rust. Ships as a single binary. English · 简体中文 Quick Start · Studio · Benchmarks · IES · Tools · Extending · Architecture · Docs --- Open Ontologies is a Rust MCP server and desktop Studio for AI-native ontology engineering. It exposes 70+ tools that let Claude build, validate, query, diff, lint, version, reason over, align, plan, certify, and govern RDF/OWL ontologies using an in-memory Oxigraph triple store — with a full three-layer Dynamics → Causal → Planner architecture, a marketplace of 33 standard ontologies, clinical crosswalks, semantic embeddings, and a full lineage audit trail. The Studio wraps the engine in a visual desktop environment: virtualized ontology tree with hierarchy lines, breadcrumb navigation, and connection explorer; AI chat panel with /build (IES-level deep) and /sketch (quick prototype) commands; Protégé-style property inspector; and lineage viewer. No JVM. No Protégé. --- What's New (three-layer architecture + 13 new primitives) The full Dynamics → Causal → Planner stack plus 13 new primitives. Every piece holds the MCP-native convention: the server provides validation and scaffolding, the connected LLM (Claude over MCP) does the intelligence. No internal LLM clients, no API keys, no provider abstractions. Three-layer architecture Layer What it ships --- --- Dynamics ActionSchema + 4 MCP tools: onto action register / applicabl","default_branch":null,"files":null,"tree":[],"storefront":"/r/fabio-rovai","claimed":false,"request_supported":{"post":"https://gitbuyer.com/r/fabio-rovai/open-ontologies/request-supported","requests":0},"note":"indexed from public GitHub; nothing is for sale on this page. Clone it from GitHub. Paid listings live at /search."}