Bibliographic Metadata by DOI or ISBN (OpenCitations Meta)
opencitationsmeta/get-metadata
Looks up bibliographic metadata in OpenCitations Meta for one or more works by DOI, ISBN, ISSN or OpenCitations OMID. Returns each work's identifiers (DOI, ISBN, OpenAlex, PubMed and OMID), title, authors and editors with ORCID iDs where known, publication date, venue, volume, issue, page, type and publisher. Several identifiers can be sent at once. An identifier Meta does not hold simply gives no record. OpenCitations data passed through unmodified and served by Eden Engine; not an official OpenCitations 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 $5.
Data source
Bibliographic metadata from OpenCitations Meta (opencitations.net), published under the CC0 public domain waiver. Served by Eden Engine; not an official OpenCitations 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: "opencitationsmeta/get-metadata" })
// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "opencitationsmeta/get-metadata" })
// 4. run: price the exact call first, then run it
omnial_execute({ tool: "opencitationsmeta/get-metadata", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "opencitationsmeta/get-metadata", 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 | $0.0026 |
- Updated
- Oct 21, 2026
Input and output schemas
Input schema
{
"type": "object",
"required": [
"ids"
],
"properties": {
"ids": {
"type": "string",
"pattern": "^(doi|isbn|issn|omid):[^\\s?#]{1,200}(__(doi|isbn|issn|omid):[^\\s?#]{1,200})*$",
"maxLength": 400,
"minLength": 5,
"description": "One identifier, or several joined by a double underscore, each written as prefix:value with the prefix doi, isbn, issn or omid. Examples: doi:10.1007/978-1-4020-9632-7, isbn:9781402096327, doi:10.1038/nature12373__doi:10.1016/j.websem.2012.08.001."
}
},
"additionalProperties": false
}Output schema
{
"type": "object",
"required": [
"results"
],
"properties": {
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"id": {
"type": "string",
"description": "Space-separated identifiers of the work, each prefix:value (doi, isbn, openalex, pmid, omid)."
},
"page": {
"type": "string"
},
"type": {
"type": "string",
"description": "Work type such as book, journal article or book chapter."
},
"issue": {
"type": "string"
},
"title": {
"type": "string"
},
"venue": {
"type": "string"
},
"author": {
"type": "string",
"description": "Authors separated by semicolons, each with identifiers in brackets, for example Kucsko, Georg [orcid:0000-0002-4189-3154 omid:ra/065021087]. Empty when Meta lists none."
},
"editor": {
"type": "string",
"description": "Editors, in the same format as author."
},
"volume": {
"type": "string"
},
"pub_date": {
"type": "string",
"description": "Publication date as year, year-month or year-month-day."
},
"publisher": {
"type": "string",
"description": "Publisher with identifiers in brackets."
}
},
"additionalProperties": true
}
}
},
"description": "`results` holds one record per identifier Meta found, in no stated order; it is empty when none were found.",
"additionalProperties": true
}