DirectoryMCP serversSearch & research

raras: MCP server (Search & research) in 2026

Disease Twin — Brazil's rare-disease knowledge graph (10,468) over MCP. Source-grounded, PT-BR.

Verified working on 2026-10-27 Rank 54 of 94 in Search & research. Source: MCP Registry record, checked 2026-10-27.

Key facts

TypeMCP server, remote (streamable HTTP)
CategorySearch & research
Endpointhttps://raras.org/api/mcp
Registry nameio.github.rarasAI/raras
Version (registry)0.2.0
Published in registry2026-05-21
Registry record updated2026-05-21
Repositoryhttps://github.com/rarasAI/raras
Websitehttps://raras.org/mcp
AuthenticationNone needed for initialize and tools/list (checked anonymously)
Latest checkUp on 2026-10-27, 717 ms to initialize
Tools listed20
Checks passed1 of 1 daily checks
Last verified working2026-10-27
Sourcehttps://registry.modelcontextprotocol.io/v0/servers/io.github.rarasAI%2Fraras/versions/latest (pulled 2026-10-27)

Tools (20)

search_diseases, get_disease_detail, find_diseases_by_phenotypes, search_phenotypes, get_sus_coverage, find_reference_centers, find_active_trials, find_similar_diseases, find_phenotypically_similar, get_graph_stats, search_papers_semantic, find_papers_for_disease, analyze_clinical_case, get_schema, explain_relation, get_literature_relations, get_hypotheses, get_research_log, get_recent_updates, get_evidence

Verification history

One probe a day: initialize, then tools/list, nothing else. Last 1 checks: 10-27 up

Install

Claude Code
claude mcp add --transport http raras https://raras.org/api/mcp
Claude (claude.ai, Desktop)

Settings > Connectors > Add custom connector. Name: raras. URL: https://raras.org/api/mcp

Cursor
{
  "mcpServers": {
    "raras": {
      "url": "https://raras.org/api/mcp"
    }
  }
}

Save as ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (this project).

ChatGPT

Settings > Connectors > Advanced > Developer mode, then Create. Name: raras. MCP server URL: https://raras.org/api/mcp. Authentication: No authentication.

Custom connectors need a plan with Developer mode; menu names change between releases.

Hermes Agent
mcp_servers:
  raras:
    url: "https://raras.org/api/mcp"

Add to ~/.hermes/config.yaml, then run /reload-mcp.

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