fabio-rovai/open-ontologies

Overview

Open-ontologies is a Rust MCP server for building, validating, querying, and reasoning over RDF/OWL ontologies. It uses an in-memory Oxigraph triple store with a native OWL2-DL tableaux reasoner, SHACL validation, and SPARQL support. The single binary runs without a JVM.

Best for

Best for
Rust developers needing a fast, self-contained ontology engine for embedded or server-side use

Use cases

• Embedding ontology reasoning into Rust applications
• Validating RDF data against SHACL shapes
• Running SPARQL queries on in-memory ontologies

How to use

Tools exposed

• onto_action_register
• onto_action_applicable
• onto_action_apply
• onto_action_list
• onto_certify_action
• onto_plan_compile_pddl
• onto_plan_classical
• onto_plan_validate
• onto_owl_shacl_coevolve_check
• onto_owl_shacl_coevolve_incremental
• onto_segment_retrieve
• onto_extract_scaffold
• onto_extract_validate
• onto_cq_run
• onto_verify_cq
• onto_cq_verdicts_list
• onto_classify_el
• onto_eval_alignment
• onto_shape_combinatorics
• onto_shape_induce

Tested with

Claude Code, Claude Desktop, Cursor, Windsurf

Example client config

{\n  "mcpServers": {\n    "open-ontologies": {\n      "command": "/path/to/open-ontologies/target/release/open-ontologies",\n      "args": ["serve"]\n    }\n  }\n}

Notes

Open-ontologies is a Rust MCP server for building, validating, querying, and reasoning over RDF/OWL ontologies. It uses an in-memory Oxigraph triple store with a native OWL2-DL tableaux reasoner, SHACL validation, and SPARQL support. The single binary runs without a JVM.

126 stars on GitHub. Last updated 2026-05-29. Licensed MIT.

Use cases

• Embedding ontology reasoning into Rust applications
• Validating RDF data against SHACL shapes
• Running SPARQL queries on in-memory ontologies

Pros

• Lightweight single binary with no JVM dependency
• Native OWL2-DL reasoning and SHACL validation built-in
• Simple MCP server interface for integration

Cons

• In-memory store limits ontology size to available RAM
• No built-in persistence or distributed query capabilities
• Smaller community and fewer integrations than Java-based alternatives

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.