Ontology Catalogue (OLS)
ols/ontologies-list
Lists the ontologies held by the EMBL-EBI Ontology Lookup Service (about 290): ontology id, title, description, homepage, preferred prefix, number of terms, properties and individuals, version and load status. Paged, 1 to 20 per page, with the total count and page count. Use the ontology id with the other OLS tools. OLS data, EMBL-EBI, served by Eden Engine; not an official OLS product.
Price
$0.0026 per call
You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.
Data source
Ontology Lookup Service (EMBL-EBI)
Data from the Ontology Lookup Service (OLS4), EMBL-EBI (https://www.ebi.ac.uk/ols4). Each ontology keeps the licence its authors chose; see the ontology's own record. Served by Eden Engine; not an official OLS or EMBL-EBI product.
Use it
Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.
Connect once and your AI can find and run this tool, and any other it needs.
// 1. search: find the tool
omnial_search({ query: "what you need" })
// 2. inspect: price and input schema
omnial_inspect({ tool: "ols/ontologies-list" })
// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "ols/ontologies-list" })
// 4. run: price the exact call first, then run it
omnial_execute({ tool: "ols/ontologies-list", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "ols/ontologies-list", input: { /* ... */ } })
// 5. settle: the call is charged when it finishes, nothing to doNot connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.
Pricing
Every charge this tool can incur.
| Charge | Price |
|---|---|
Per call | $0.0026 |
- Updated
- Oct 25, 2026
Input and output schemas
Input schema
{
"type": "object",
"required": [
"size"
],
"properties": {
"page": {
"type": "integer",
"maximum": 300,
"minimum": 0,
"description": "Zero-based page number; leave out for the first page."
},
"size": {
"type": "integer",
"maximum": 20,
"minimum": 1,
"description": "Ontologies per page, 1 to 20."
}
},
"additionalProperties": false
}Output schema
{
"type": "object",
"required": [
"page"
],
"properties": {
"page": {
"type": "object",
"properties": {
"size": {
"type": "integer"
},
"number": {
"type": "integer"
},
"totalPages": {
"type": "integer"
},
"totalElements": {
"type": "integer"
}
},
"description": "Paging block: size, totalElements, totalPages and number.",
"additionalProperties": true
},
"_links": {
"type": "object",
"additionalProperties": true
},
"_embedded": {
"type": "object",
"properties": {
"ontologies": {
"type": "array",
"items": {
"type": "object",
"properties": {
"lang": {
"type": [
"string",
"null"
]
},
"_links": {
"type": [
"object",
"null"
],
"properties": {
"self": {
"type": [
"object",
"null"
],
"additionalProperties": true
},
"terms": {
"type": [
"object",
"null"
],
"additionalProperties": true
},
"properties": {
"type": [
"object",
"null"
],
"additionalProperties": true
},
"individuals": {
"type": [
"object",
"null"
],
"additionalProperties": true
}
},
"additionalProperties": true
},
"config": {
"type": [
"object",
"null"
],
"properties": {
"id": {
"type": [
"string",
"null"
]
},
"logo": {
"type": "null"
},
"title": {
"type": [
"string",
"null"
]
},
"isSkos": {
"type": [
"boolean",
"null"
]
},
"tracker": {
"type": [
"string",
"null"
]
},
"version": {
"type": [
"string",
"null"
]
},
"baseUris": {
"type": [
"array",
"null"
],
"items": {}
},
"creators": {
"type": [
"array",
"null"
],
"items": {}
},
"homepage": {
"type": [
"string",
"null"
]
},
"oboSlims": {
"type": [
"boolean",
"null"
]
},
"namespace": {
"type": [
"string",
"null"
]
},
"versionIri": {
"type": [
"string",
"null"
]
},
"annotations": {
"type": "null"
},
"description": {
"type": [
"string",
"null"
]
},
"mailingList": {
"type": [
"string",
"null"
]
},
"fileLocation": {
"type": [
"string",
"null"
]
},
"allowDownload": {
"type": [
"boolean",
"null"
]
},
"labelProperty": {
"type": [
"string",
"null"
]
},
"preferredPrefix": {
"type": [
"string",
"null"
]
},
"hiddenProperties": {
"type": [
"array",
"null"
],
"items": {}
},
"synonymProperties": {
"type": [
"array",
"null"
],
"items": {}
},
"preferredRootTerms": {
"type": [
"array",
"null"
],
"items": {}
},
"definitionProperties": {
"type": [
"array",
"null"
],
"items": {}
},
"hierarchicalProperties": {
"type": [
"array",
"null"
],
"items": {}
}
},
"additionalProperties": true
},
"loaded": {
"type": [
"string",
"null"
]
},
"status": {
"type": [
"string",
"null"
]
},
"message": {
"type": [
"string",
"null"
]
},
"updated": {
"type": [
"string",
"null"
]
},
"version": {
"type": [
"string",
"null"
]
},
"baseUris": {
"type": [
"array",
"null"
],
"items": {
"type": [
"string",
"null"
]
}
},
"fileHash": {
"type": "null"
},
"languages": {
"type": [
"array",
"null"
],
"items": {
"type": [
"string",
"null"
]
}
},
"ontologyId": {
"type": "string",
"description": "Ontology id used in the other tools, e.g. go."
},
"loadAttempts": {
"type": [
"integer",
"null"
]
},
"numberOfTerms": {
"type": [
"integer",
"null"
],
"description": "Number of terms in the ontology."
},
"numberOfProperties": {
"type": [
"integer",
"null"
]
},
"numberOfIndividuals": {
"type": [
"integer",
"null"
]
}
},
"additionalProperties": true
}
}
},
"additionalProperties": true
}
},
"description": "HAL response: ontologies in `_embedded.ontologies` (absent past the last page), paging in `page`.",
"additionalProperties": true
}