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io.github.rarasAI/raras
io.github.rarasAI/raras in the official MCP registry.
Endpoint https://raras.org/api/mcp. Source: github.com/rarasAI/raras.
The registry describes it as: Disease Twin — Brazil's rare-disease knowledge graph (10,468) over MCP. Source-grounded, PT-BR.
We read its 20 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
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
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-github-rarasai-raras)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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