wikidata-mcp-server

Public Hosted Server: https://wikidata.caseyjhand.com/mcp

Overview

Wikidata's knowledge graph. Search and fetch entities, traverse the graph with SPARQL, and resolve external identifiers like DOI, PMID, ORCID, OpenAlex, and IMDb to their Wikidata items. No API key required.

Tools

Resources

All resource data is also reachable via tools.

Related MCP server: MediaWiki MCP adapter

Capability reference

wikidata_search_entities tool

• Searches labels, aliases, and descriptions; type="item" for people, places, and works, type="property" for P-IDs

• Takes a Wikidata language code (en, de, pt-br; case-insensitive); offset pagination, up to 50 results per call

• Each hit includes match metadata saying whether it matched a label or alias

wikidata_get_entity tool

• Q-IDs (e.g. Q76) fetch items and P-IDs (e.g. P31) fetch properties; fields selects labels, descriptions, aliases, statements, or sitelinks, and narrows the upstream fetch (Q76 is 344,114 bytes whole, 6,703 for labels alone)

• languages filters multilingual maps to the given language codes

• An entity too large to inline returns an outline of field categories with byte sizes; its retrieval_notice names a fields set that fits and points oversized statements or sitelinks to the tool that can narrow them

wikidata_get_labels tool

• Up to 50 IDs per call via the MediaWiki wbgetentities API, with one or more language codes per request

• Reports a found count and notFound IDs for partial results

• Meant to follow a SPARQL query: run it, then humanize the QIDs

wikidata_get_statements tool

• properties limits the fetch to specific P-IDs (omit for all); item QIDs and quantity units in values, qualifiers, and references are resolved to labels unless resolve_labels=false

• References stay grouped by source; unknown or absent values come back as somevalue / novalue

• A statement set too large to inline returns an outline of P-IDs with byte sizes, largest first (unfiltered, Q30 carries 467 properties across 1,717 statements); re-call with properties whose sizes sum to 24,000 or less, as the retrieval_notice suggests

wikidata_get_sitelinks tool

• Maps site codes (e.g. enwiki) to article titles and URLs; sites filters to specific codes

• wikis_only=true keeps only Wikipedia links (drops Wiktionary, Wikiquote, Wikisource, etc.)

• Q-IDs only; P-IDs are not supported

wikidata_sparql_query tool

• Runs SELECT queries against the Wikidata Query Service (Blazegraph); ASK, CONSTRUCT, DESCRIBE, updates, and plain search text are rejected before the request is sent

• Standard prefixes (wd:, wdt:, p:, ps:, pq:, wikibase:, bd:) and the wikibase:label SERVICE (when the query uses a ?<var>Label, ?<var>Description, or ?<var>AltLabel variable) are added automatically; language takes one code or a fallback list like fr,en

• Results are SPARQL 1.1 JSON bindings, capped at 64,000 bytes per response and cut between whole rows; a larger result returns its leading rows with returnedCount, totalCount, and a notice to page with ORDER BY plus LIMIT/OFFSET or to aggregate

• Client timeout is 1–55s (server hard limit 60s); rate limit is 60 requests/min and 5 concurrent requests per IP

wikidata_resolve_external_id tool

• Resolves DOI (P356), PMID (P698), ORCID (P496), OpenAlex ID (P10283), IMDb ID (P345), and other external IDs to a QID; whitespace and resolver URL prefixes are stripped, and DOIs, PMIDs, and ORCIDs are normalized

• The property must have data type external-id; item-valued or media properties (e.g. P31, P18) are rejected

• Returns match=null when not found (the Query Service lags the live wiki, so null is not proof of absence) and multipleMatches when more than one entity claims the same ID; the label uses the requested language, falling back to mul

wikidata://entity/{id} resource

• Compact markdown summary — labels (all languages), English description, instance-of (P31), enwiki Wikipedia link, image (P18), and statement count

• Returned as text/markdown; for full entity data, use wikidata_get_entity

• id is a Q-ID or P-ID, the same identifiers the tools take

Features

Built on @cyanheads/mcp-ts-core: stdio and Streamable HTTP transports, pluggable auth (none / jwt / oauth), swappable storage (in-memory, filesystem, Supabase, Cloudflare KV/R2/D1), structured logging with optional OpenTelemetry tracing.

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 (WIKIDATA_USER_AGENT)

• Separate timeout configuration for REST and SPARQL endpoints (WIKIDATA_REST_TIMEOUT_MS, WIKIDATA_SPARQL_TIMEOUT_MS)

Agent-friendly output:

• All tools echo relevant input parameters in the response for traceability

• wikidata_get_labels designed to follow SPARQL result sets — run the query, then humanize in one call

• wikidata_resolve_external_id returns multipleMatches instead of a false null when a Wikidata data-integrity issue puts duplicate claims on one external ID

• Oversized entities and statement sets return a kind: "outline" payload — field/property sizes plus a retrieval_notice naming the exact re-call — instead of a truncated or oversized response

Getting started

Public Hosted Instance

A public instance is available at https://wikidata.caseyjhand.com/mcp — no installation required. Point any MCP client at it via Streamable HTTP:

{
  "mcpServers": {
    "wikidata-mcp-server": {
      "type": "streamable-http",
      "url": "https://wikidata.caseyjhand.com/mcp"
    }
  }
}

Self-Hosted / Local

Add the following to your MCP client configuration file.

{
  "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):

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

Or with Docker:

{
  "mcpServers": {
    "wikidata-mcp-server": {
      "type": "stdio",
      "command": "docker",
      "args": ["run", "-i", "--rm", "-e", "MCP_TRANSPORT_TYPE=stdio", "ghcr.io/cyanheads/wikidata-mcp-server:latest"]
    }
  }
}

For Streamable HTTP, set the transport and start the server:

MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http
# Server listens at http://localhost:3010/mcp

Prerequisites

• Bun v1.4.0 or higher (or Node.js ≥ 24.0.0).

Installation

1. Clone the repository:

git clone https://github.com/cyanheads/wikidata-mcp-server.git

2. Navigate into the directory:

cd wikidata-mcp-server

3. Install dependencies:

bun install

4. Configure environment:

cp .env.example .env
# edit .env and set any overrides

Configuration

All configuration is validated at startup via Zod schemas. Key environment variables:

See .env.example for the full list of optional overrides.

Running the server

Local development

• Build and run the production version:

  # One-time build
  bun run rebuild
  
  # Run the built server
  bun run start:http
  # or
  bun run start:stdio

• Run checks and tests:

  bun run devcheck  # Lints, formats, type-checks, and more
  bun run test      # Runs the test suite

Docker

docker build -t wikidata-mcp-server .
docker run --rm -p 3010:3010 wikidata-mcp-server

The Dockerfile defaults to HTTP transport, stateless session mode, and logs to /var/log/wikidata-mcp-server. OpenTelemetry peer dependencies are installed by default — build with --build-arg OTEL_ENABLED=false to omit them.

Project structure

Development guide

See CLAUDE.md for development guidelines and architectural rules. The short version:

• Handlers throw, framework catches — no try/catch in tool logic

• Use ctx.log for logging, ctx.state for storage

• Register new tools and resources in the createApp() arrays

• Wrap external API calls: validate raw → normalize to domain type → return output schema; never fabricate missing fields

Contributing

Issues are welcome. Run checks and tests before submitting:

bun run devcheck
bun run test

License

Apache-2.0 — see LICENSE for details.