Raras Disease Twin — MCP Server
MCP serverDev toolsraras is a Disease Twin for Brazil: a structured map of knowledge covering 10,468 rare diseases, in Brazilian Portuguese. Once your AI has it, it can answer rare-disease questions using information grounded in documented sources. It is useful for researching rare diseases and how they relate to one another.
Use Raras Disease Twin — MCP Server in Claude, ChatGPT or Ahel Desktop
Free. Sign in, add Raras Disease Twin — MCP Server and connect your AI. About a minute.
Also: Claude Code · Cursor · Codex
Then ask your AI: use Raras Disease Twin to search diseases
No key or account is asked for. Not verified by us yet: Ahel has not run a call through it.
Details
Available today. Use it from your connected AI after setup.
No key or account is asked for. Not verified by us yet: Ahel has not run a call through it.
Add raras, then ask your AI about a rare disease by name to see what it returns. Source code and documentation are at github.com/rarasai/raras.
What your AI can do with it
- Answer questions about 10,468 rare diseases relevant to Brazil
- Ground answers in documented sources
- Search the rare-disease knowledge map
- Explore how diseases relate to each other
- Work in Brazilian Portuguese
Install Raras Disease Twin — MCP Server
The server’s own address, for the clients that take one directly. Or connect Ahel once and every client you use reads it from one address, with the account kept on Ahel rather than in each client’s config.
Claude Code
claude mcp add --transport http --scope user raras-disease-twin-mcp-server 'https://raras.org/api/mcp'Run it once in your project, then open /mcp to approve any sign-in the server asks for.
Claude Desktop
https://raras.org/api/mcpAdd a custom connector in Settings, paste this address, and approve the sign-in.
Cursor
cursor://anysphere.cursor-deeplink/mcp/install?name=raras-disease-twin-mcp-server&config=eyJ1cmwiOiJodHRwczovL3JhcmFzLm9yZy9hcGkvbWNwIn0=Open the link and Cursor adds the server at that address.
ChatGPT
https://raras.org/api/mcpIn Settings, enable Developer mode, create an MCP app, and paste this address. Your plan and workspace must allow custom apps.
Codex
codex mcp add raras-disease-twin-mcp-server --url 'https://raras.org/api/mcp'Run it once, then sign in with codex mcp login raras-disease-twin-mcp-server if the server asks for an account.
From the project's README
As published by rarasai/raras in README.md.
Brazilian rare-disease knowledge graph (10,468 diseases) exposed via the Model Context Protocol (MCP).
Each disease is an addressable Disease Twin (disease://{orphaCode}): genes, HPO phenotypes, SUS coverage,
clinical trials, literature-mined treatments, repurposing hypotheses, and grounded multi-hop reasoning — PT-BR
first, source-grounded, never diagnoses.
Connect (no install)
- Remote endpoint:
https://raras.org/api/mcp(Streamable HTTP, public, read-only) - Claude Code:
claude mcp add --transport http raras https://raras.org/api/mcp - claude.ai / Desktop: Settings → Connectors → Add custom connector → paste the URL
- Docs: https://raras.org/mcp
Skill
SKILL.md is an installable Claude Skill — drop it in .claude/skills/raras-disease-twin/.
License
Data: CC-BY-4.0 · Code: MIT · https://raras.org
Tools it offers (20)
What this server listed when Ahel dialed its public endpoint in Sep 2026, with no key and no account of yours. The names are the server’s own.
search_diseasesget_disease_detailfind_diseases_by_phenotypessearch_phenotypesget_sus_coveragefind_reference_centersfind_active_trialsfind_similar_diseasesfind_phenotypically_similarget_graph_statssearch_papers_semanticfind_papers_for_diseaseanalyze_clinical_caseget_schemaexplain_relationget_literature_relationsget_hypothesesget_research_logget_recent_updatesget_evidence
Signals
- Last commit
- May 2026
Advanced
- Delivery
- raras MCP server → your Ahel connector (mcp.ahel.ai) → your AI.
- Item type
- mcp-server
- Key
io-github-rarasai-raras- Source
- github.com/rarasai/raras
- Hosted endpoint
https://raras.org/api/mcp