seandavi/ols-mcp-server

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A model context protocol (MCP) server for the EBI Ontology Lookup Service (OLS)

概要

Large Language Models are notoriously bad at working with ontologies, often hallucinating terms or their identifiers. This server provides a reliable way to access and query ontologies, ensuring accurate and up-to-date information. This repository contains a Model Context Protocol (MCP) server providing access to the Ontology Lookup Service (OLS) API. This server enables AI assistants to search for and retrieve ontological terms, concepts, and hierarchies from various biological and medical ontologies. This server is designed to work seamlessly with AI assistants like Claude Desktop, allowing users to query ontologies using natural language. It supports a wide range of ontologies, including Gene Ontology (GO), Human Phenotype Ontology (HP), and many others.

README

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OLS MCP Server

This repository contains a Model Context Protocol (MCP) server providing access to the Ontology Lookup Service (OLS) API. This server enables AI assistants to search for and retrieve ontological terms, concepts, and hierarchies from various biological and medical ontologies.

This server is designed to work seamlessly with AI assistants like Claude Desktop, allowing users to query ontologies using natural language. It supports a wide range of ontologies, including Gene Ontology (GO), Human Phenotype Ontology (HP), and many others.

Without (top part of image below) and with mcp server engaged (bottom of figure below):

Features

The OLS MCP Server provides the following tools:

🔍 Search Terms: Search for terms across ontologies with flexible filtering
📚 Search Ontologies: Discover available ontologies and their metadata
ℹ️ Get Ontology Information: Retrieve detailed information about specific ontologies
🎯 Get Term Information: Get comprehensive details about specific terms
🌳 Get Term Children: Find direct child terms in ontological hierarchies
👨‍👩‍👧‍👦 Get Term Ancestors: Retrieve parent terms and ancestors
🤖 Find Similar Terms: Discover semantically similar terms using LLM embeddings

Supported Ontologies

The server works with any ontology available through the EBI Ontology Lookup Service, including:

GO (Gene Ontology)
EFO (Experimental Factor Ontology)
HP (Human Phenotype Ontology)
MONDO (Monarch Disease Ontology)
ChEBI (Chemical Entities of Biological Interest)
UBERON (Uber-anatomy ontology)
And many more…

Installation

Prerequisites

Python 3.12 or higher
uv package manager

Install uv (if not already installed)

# macOS/Linux
curl -LsSf https://astral.sh/uv/install.sh | sh

# Windows
powershell -c "irm https://astral.sh/uv/install.ps1 | iex"

Install the OLS MCP Server

# Clone the repository
git clone https://github.com/seandavi/ols-mcp-server.git
cd ols-mcp-server

# Install dependencies
uv sync

# Install as a tool (optional)
uv tool install .

Configuration

Claude Desktop Configuration

To use this server with Claude Desktop, add the following configuration to your Claude Desktop config file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {

GitHub で README 全文を見る

インストール

This server does not publish a one-line install command.

Open the repository installation guide MCP 初心者？mcpskill.org のガイドから始めましょう →

設定

{
  "mcpServers": {
    "ols-mcp-server": {
      "command": "uv",
      "args": [
        "tool",
        "run",
        "ols-mcp-server"
      ],
      "env": {}
    }
  }
}