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STRING Database MCP Server
org.string-db/string-mcp in the official MCP registry.
Endpoint https://mcp.string-db.org/. Source: github.com/meringlab/string-mcp.
The registry describes it as: Query STRING interactions, enrichment, annotations, homology, and PPI networks.
We read its 17 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules.
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
string_resolve_proteins string_interactions_query_set string_all_interaction_partners string_visual_network string_network_clustering string_network_link string_homology string_interaction_evidence string_enrichment string_functional_annotation string_enrichment_image_url string_ppi_enrichment string_proteins_for_term string_sequence_search string_query_species string_create_file string_help
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/org-string-db-string-mcp)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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