Open Targets MCP Server

A read-only MCP server for exploring targets, diseases, drugs and genetic evidence through the Open Targets Platform. Use names or IDs, retrieve supporting evidence, and explore drug-repurposing candidates. No Open Targets API key required.

Install

Requires uv.

Claude Code

claude mcp add opentargets -- uvx opentargets-mcp

Claude Desktop and Cursor: add this to claude_desktop_config.json (Settings → Developer → Edit Config) or ~/.cursor/mcp.json, then restart:

{
  "mcpServers": {
    "opentargets": {
      "command": "uvx",
      "args": ["opentargets-mcp"]
    }
  }
}

VS Code

code --add-mcp '{"name":"opentargets","command":"uvx","args":["opentargets-mcp"]}'

Codex

codex mcp add opentargets -- uvx opentargets-mcp

Any other stdio MCP client works the same way: command uvx, argument opentargets-mcp.

Tips:

• If the client reports spawn uvx ENOENT, use the full path from which uvx.
• Use opentargets-mcp@latest as the argument to pick up new releases.
• On Apple Silicon, a cryptography build error can indicate uv picked an Intel (Rosetta) Python. uv python find is a first clue; cached tool environments and desktop clients may use a different interpreter.

What you can ask

• "Which drugs target EGFR, and how far along are they?"
• "Which genes are most strongly associated with asthma?"
• "Show the evidence linking BRAF to melanoma."
• "Suggest drug repurposing candidates for type 2 diabetes."

Use names or IDs: gene symbols, disease and drug names, rsIDs, or Ensembl, MONDO and ChEMBL IDs. If a name matches several entities, the tool lists the candidates so you can pick one.

Tools

68 tools. Run uvx opentargets-mcp --list-tools for the full list.

Many tools accept fields (dot-paths such as ["target.approvedSymbol"]) to return only what you need. For anything the curated tools don't cover, use graphql_query.

Evidence results include datasource IDs and PubMed references where available. Use get_api_metadata to record the Open Targets API and data release with your analysis. clinicalReportCount counts report records, not unique trials; use graphql_query for full reports.

Configuration

The defaults work for local use. To change them, set environment variables or pass flags (uvx opentargets-mcp --help):

Proxies are read from HTTPS_PROXY, HTTP_PROXY and NO_PROXY.

Self-host

From source:

git clone https://github.com/nickzren/opentargets-mcp
cd opentargets-mcp
uv run opentargets-mcp

With Docker (HTTP on port 8000), from the clone:

docker compose up -d --build

Connect your MCP client to http://localhost:8000/mcp.

Development

uv sync --extra dev
uv run ruff check src tests
uv run pytest -m "not live"   # offline
uv run pytest -m live         # calls the Open Targets API

Example scripts are in examples/.

License

MIT