# DOI metadata search

Search 160M+ Crossref records (journal articles, books, proceedings) by free text: DOI, title, authors, publication date, journal, publisher, citation count. Needs query. Served by Crossref.

Search 160M+ Crossref records (journal articles, books, proceedings) by free text: DOI, title, authors, publication date, journal, publisher, citation count. Supports Crossref filters.

- Tool ID: `crossref/search-works`
- Name in the catalog: DOI metadata search (Crossref)
- Provider: [Crossref](/providers/crossref.md)
- Capability: [Scientific papers](/tools/knowledge/papers.md)
- Price: no charge per call
- Authentication: an authorised Agentik workspace is required for execution, including zero-price tools.

## Pricing contract

No charge per call. A workspace is still needed so your agent can call it.


```json
{
  "model": "per_call",
  "amountUsd": 0
}
```

## Complete input schema


```json
{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 1,
      "maxLength": 300
    },
    "rows": {
      "type": "integer",
      "minimum": 1,
      "maximum": 20,
      "default": 5
    },
    "filter": {
      "type": "string",
      "maxLength": 200,
      "description": "Crossref filter, e.g. 'from-pub-date:2024,type:journal-article'"
    },
    "sort": {
      "type": "string",
      "enum": [
        "relevance",
        "published",
        "is-referenced-by-count",
        "created"
      ],
      "default": "relevance"
    }
  },
  "required": [
    "query"
  ],
  "additionalProperties": false
}
```

## Published example

This is the provider tool’s published example. Replace example values with the user’s requested inputs, respecting the schema; do not execute an example merely to test a connection.


```json
{
  "tool_id": "crossref/search-works",
  "input": {
    "query": "large language models",
    "rows": 2
  }
}
```

## Execute and retrieve

Inspect again before execution, explain the price and obtain the required authority. Use MCP run_tool or POST /v1/run with this tool ID, valid input and an idempotency key. Save the returned run ID and follow the actual state. If Agentik answers that the tool is temporarily unavailable, do not retry it blindly; use discovery to propose an alternative.

A partial or uncertain result can still have consumed provider resources. Consult [billing](/docs/billing.md), [idempotency](/docs/idempotency.md) and [asynchronous results](/docs/async.md).

Licence: Crossref metadata, no reuse restriction.

Attribution: Metadata from Crossref (api.crossref.org).

[Provider documentation](https://api.crossref.org/swagger-ui/index.html)

[REST inspection](https://api.agentik.cc/v1/tools/crossref/search-works) · [OpenAPI](/openapi.json) · [Connection guide](/connect.md)

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[HTML page](/providers/crossref/search-works) · [Agent index](/llms.txt)