ontology_query
hybrid vector + BM25 + graph query.
How to use it
ontology_query is exposed by the OpenCrab MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the ontology_query tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
Install OpenCrab
$
claude mcp add opencrab -- opencrab serveOther tools in OpenCrab (7)
harness_promotion_apply
apply a CrabHarness promotion package.
ontology_add_edge
add a grammar-validated edge.
ontology_add_node
add or update a grammar-validated node.
ontology_impact
I1-I7 impact analysis.
ontology_ingest
ingest text into the local ontology stores.
ontology_manifest
return the full grammar.
ontology_rebac_check
relationship-based access check.