wikidata-mcp-server

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  <h1>@cyanheads/wikidata-mcp-server</h1>
  <p><b>Search and fetch Wikidata entities, execute SPARQL queries, and resolve external identifiers via MCP. STDIO or Streamable HTTP.</b>
  <div>7 Tools • 1 Resource</div>
  </p>
</div>

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**Public Hosted Server:** [https://wikidata.caseyjhand.com/mcp](https://wikidata.caseyjhand.com/mcp)

</div>

---

## Tools

7 tools for working with Wikidata's knowledge graph:

| Tool | Description |
|:---|:---|
| `wikidata_search_entities` | Search for items or properties by text query, returning QIDs/PIDs with labels, descriptions, and match metadata |
| `wikidata_get_entity` | Fetch a full entity by QID or PID with optional field and language filtering |
| `wikidata_get_labels` | Batch-resolve up to 50 QIDs or PIDs to human-readable labels and descriptions |
| `wikidata_get_statements` | Fetch property claims for an entity with qualifier detail and QID label resolution |
| `wikidata_get_sitelinks` | Fetch Wikipedia and Wikimedia project article URLs for a Wikidata item |
| `wikidata_sparql_query` | Execute a SPARQL SELECT query against the Wikidata Query Service |
| `wikidata_resolve_external_id` | Look up a Wikidata entity by an external identifier (DOI, PubMed ID, ORCID, OpenAlex ID, etc.) |

### `wikidata_search_entities`

Search Wikidata for items or properties by text query.

- Searches labels, aliases, and descriptions
- `type="item"` for real-world concepts (people, places, works); `type="property"` for predicate P-IDs
- Language-aware results (BCP 47 language codes)
- Offset-based pagination, up to 50 results per call
- Returns match metadata indicating whether the hit was on a label or alias

---

### `wikidata_get_entity`

Fetch a Wikidata entity by QID or PID with field selection.

- Q-IDs (e.g. `Q76`) fetch items; P-IDs (e.g. `P31`) fetch properties — endpoint routing is automatic
- `fields` parameter selects `labels`, `descriptions`, `aliases`, `statements`, or `sitelinks`
- `fields` narrows the upstream fetch, not just the response — Q76 is 344,114 bytes whole, 6,703 for `labels` alone
- `languages` parameter filters multilingual maps to specific language codes, client-side (the entity endpoint takes no language parameter)
- An entity too large to inline returns a field-category outline with byte sizes instead of the data — follow its `retrieval_notice`: it names a literal `fields` set already measured to fit (category sizes are additive, so requesting every name listed would overflow again), defers the remainder to a further call, and redirects a category too large to deliver whole (statements or sitelinks on a major item) to the tool that can narrow it

---

### `wikidata_get_labels`

Batch-resolve QIDs/PIDs to human-readable labels and descriptions.

- Up to 50 IDs per call, batched via the MediaWiki `wbgetentities` API
- Supports multiple language codes per request
- Reports `found` count and `notFound` IDs for partial-result handling
- Designed for the common agent pattern: run a SPARQL query, then humanize the QID results

---

### `wikidata_get_statements`

Fetch property claims for a Wikidata entity with full qualifier and reference detail.

- `properties` parameter fetches only specific P-IDs — omit to return all statements
- Value QIDs are resolved to human-readable labels by default via a batched label call
- Set `resolve_labels=false` for raw QIDs only (faster, smaller payload)
- A statement set too large to inline returns an outline of the available P-IDs with byte sizes, largest first, instead of the statements — re-call with `properties` for the ones you need (unfiltered, Q30 carries 467 properties across 1,717 statements)
- Preferred-rank statements represent the most current values
- Designed for fact verification: "what does Wikidata say about this entity's {property}?"

---

### `wikidata_get_sitelinks`

Fetch Wikipedia and Wikimedia project article URLs for a Wikidata item.

- Maps site codes (e.g., `enwiki`) to article titles and URLs
- `sites` parameter filters to specific site codes
- `wikis_only=true` returns only Wikipedia links (excludes Wiktionary, Wikiquote, Wikisource, etc.)
- Major items can have 300+ sitelinks across languages
- Only Q-IDs (items) have sitelinks — P-IDs are not supported

---

### `wikidata_sparql_query`

Execute a SPARQL SELECT query against the Wikidata Query Service (Blazegraph).

- Full graph power: multi-hop traversals, aggregations, subqueries, OPTIONAL, FILTER, UNION, BIND
- Standard Wikidata prefixes (`wd:`, `wdt:`, `p:`, `ps:`, `pq:`, `wikibase:`, `bd:`) are auto-injected
- `wikibase:label` SERVICE auto-injected when `language` is set and the query uses `?<var>Label` variables
- Results in SPARQL 1.1 JSON format: each binding is `{ type, value, "xml:lang"? }`
- Hard server timeout is 60s; client-side `timeout` parameter (1–55s) applies earlier
- Rate-limited at 60 requests/min and 5 concurrent requests per IP

---

### `wikidata_resolve_external_id`

Look up a Wikidata entity by an external identifier.

- Common use cases: CrossRef DOI → QID (P356), PubMed PMID → QID (P698), ORCID → author QID (P496), OpenAlex ID → entity QID (P10283), IMDb ID (P345)
- Automatic value normalization: surrounding whitespace trimmed, resolver URL prefixes stripped (`https://doi.org/`, `https://pubmed.ncbi.nlm.nih.gov/`, `https://orcid.org/`), DOIs uppercased, PMID prefixes stripped, ORCID hyphens normalized
- The property's data type must be `external-id` — item-valued or media properties (e.g. `P31`, `P18`) are rejected rather than returning an empty match
- Returns `match=null` when not found (the Query Service lags the live wiki, so a null is not proof of absence)
- Returns `multipleMatches` when a Wikidata data integrity issue causes more than one entity to claim the same external ID
- Designed for cross-server joins with pubmed-mcp-server, crossref-mcp-server, and openalex-mcp-server

## Resource

| Type | Name | Description |
|:---|:---|:---|
| Resource | `wikidata://entity/{id}` | Compact markdown summary of a Wikidata entity — labels, English description, instance-of, Wikipedia link, image, and statement count |

All resource data is also reachable via tools.

## Features

Built on [`@cyanheads/mcp-ts-core`](https://www.npmjs.com/package/@cyanheads/mcp-ts-core):

- Declarative tool definitions — single file per tool, framework handles registration and validation
- Unified error handling across all tools
- Pluggable auth (`none`, `jwt`, `oauth`)
- Swappable storage backends: `in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`
- Structured logging with optional OpenTelemetry tracing
- Runs locally (stdio/HTTP) from the same codebase

Wikidata-specific:

- Wikidata REST API v1 for entity and statement fetches — no SPARQL overhead for lookup operations
- MediaWiki `wbgetentities` API for efficient batch label resolution
- Wikidata Query Service (Blazegraph) for SPARQL with auto-injected prefix headers and label SERVICE
- Configurable `User-Agent` per Wikimedia policy
- Separate timeout configuration for REST and SPARQL endpoints

Agent-friendly output:

- `wikidata_get_labels` designed to follow SPARQL result sets — run the query, then humanize in one call
- `wikidata_resolve_external_id` handles DOI/PMID/ORCID normalization transparently, with `multipleMatches` for data integrity edge cases
- `wikidata_get_statements` resolves QID values to labels in the same call, with `resolve_labels=false` escape hatch for raw payloads
- All tools echo input parameters in the response for traceability

## Getting started

### Self-Hosted / Local

Add the following to your MCP client configuration file.

```json
{
  "mcpServers": {
    "wikidata-mcp-server": {
      "type": "stdio",
      "command": "bunx",
      "args": ["@cyanheads/wikidata-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}
```

Or with npx (no Bun required):

```json
{
  "mcpServers": {
    "wikidata-mcp-server": {