`list_ontologies`

Pack: ebi-ols · Connect: https://pipeworx.io/mcp (see Connect below for a single-pack URL)

No MCP client? Call it directly: GET https://gateway.pipeworx.io/v1/tools/list_ontologies for the schema, then POST the same URL with its arguments for the data.

EMBL-EBI Ontology Lookup Service (OLS4) — page through every biomedical ontology loaded into OLS, such as GO, EFO, MONDO, ChEBI, HPO and UBERON. Returns each ontology’s id, title, description, term count, version and status, with size/page controls. Answers which biomedical ontologies are searchable here and what the short id for one is.

Parameters

Name	Type	Required	Description
`size`	number	no	1-500 (default 20).
`page`	number	no	0-based page (default 0).

Example call

Arguments

{
  "size": 20,
  "page": 0
}

curl

curl -X POST https://gateway.pipeworx.io/ebi-ols/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"list_ontologies","arguments":{"size":20,"page":0}}}'

TypeScript (@pipeworx/sdk)

import { Pipeworx } from '@pipeworx/sdk';
const pipeworx = new Pipeworx();

const result = await pipeworx.call('list_ontologies', {
  "size": 20,
  "page": 0
});

More examples

{
  "size": 100,
  "page": 1
}

Response shape

Full JSON Schema

{
  "type": "object",
  "description": "Paginated list of loaded ontologies from EBI OLS4"
}

Connect

Add this to your MCP client config — every tool in the catalog, including this one — or use one-click install buttons:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://pipeworx.io/mcp"
    }
  }
}

Connect to just the ebi-ols pack

{
  "mcpServers": {
    "ebi-ols": {
      "url": "https://gateway.pipeworx.io/ebi-ols/mcp"
    }
  }
}

See Getting Started for client-specific install steps.

list_ontologies