generated: '2026-07-19'
method: searched
status: published
source: https://github.com/ExtensityAI/ontoloom
server:
  name: ontoloom
  description: MCP server that lets AI agents build and explore OWL 2 EL ontologies stored in SQLite databases.
  transport: stdio
  maturity: alpha
  language: python
  python: '3.12'
  repository: https://github.com/ExtensityAI/ontoloom
  run: uv run --project packages/mcp python -m ontoloom_mcp.server
  install:
  - method: claude-code-plugin
    command: /plugins add /path/to/ontoloom/plugins/claude-plugin
  - method: mcp-config
    note: Add to .mcp.json with stdio transport running the ontoloom_mcp.server module.
tools:
- name: create_ontology
  category: setup
- name: set_prefix
  category: setup
- name: remove_prefix
  category: setup
- name: add_axioms
  category: build
- name: remove_axioms
  category: build
- name: annotate_axiom
  category: build
- name: replace_axiom
  category: build
- name: rename_iri
  category: build
- name: describe_ontology
  category: query
- name: get_entity
  category: query
- name: find_entities
  category: query
- name: find_axioms
  category: query
- name: find_duplicate_entities
  category: query
- name: match_axioms
  category: query
- name: create_selection
  category: selections
- name: read_selection
  category: selections
- name: list_selections
  category: selections
- name: remove_selections
  category: selections
- name: export_jsonl
  category: export
deployment:
  mode: local-stdio
  verified: searched
  tools: 19
  checked: '2026-08-12'
  source: catalog MCP census