About MCP Queen
MCP Queen is a public discovery and evidence service for MCP servers, aimed at developers and agents assessing services before connecting. It provides operational observations and Trust Receipts, not security or compliance certification.
Key features
- 01Search MCP servers and tools
- 02View grades and dated observations
- 03Inspect Trust Receipts and evidence
- 04Submit feedback to a quarantined queue
Use cases
- 01Review evidence before connecting an MCP server
- 02Filter registry servers by tools or grades
MCP support
Its Streamable HTTP MCP endpoint exposes six read-only discovery and evidence tools plus a feedback tool that writes to a quarantined review queue. The repository's stdio bridge forwards messages to the hosted endpoint.
Configuration
Remote servers need no local install. Pick your client, then copy the config or install in one click.
https://mcpqueen.com/mcpclaude mcp add --transport http com-mcpqueen-registry https://mcpqueen.com/mcp{"mcpServers":{"com-mcpqueen-registry":{"type":"http","url":"https://mcpqueen.com/mcp"}}}Open in Cursor{"servers":{"com-mcpqueen-registry":{"type":"http","url":"https://mcpqueen.com/mcp"}}}Open in VS Code{"mcpServers":{"com-mcpqueen-registry":{"type":"http","url":"https://mcpqueen.com/mcp"}}}{"mcpServers":{"com-mcpqueen-registry":{"serverUrl":"https://mcpqueen.com/mcp"}}}Run commands in a terminal; paste JSON into the client’s MCP config and restart. Servers that need sign-in will prompt on first connect.
Tools
7| Parameter | Type | Required | Description |
|---|---|---|---|
| auth | enum | No | Filter by authentication state (default any)any | open | required |
| limit | number | No | Max results (default 10, max 25) |
| query | string | Yes | Keyword or task to search name/title/description for |
| category | string | No | Optional category filter: Dev & Code, Data & Databases, Web & Search, AI & Agents, Finance & Crypto, Communication, Productivity, Security, Commerce, Media & Design, Cloud & Infra, Science & Health, Other |
| minimum_grade | enum | No | Worst acceptable live gradeA | B | C | D | F |
| max_latency_ms | number | No | Maximum measured initialize latency in milliseconds |
Details
From the project READMEMCP Queen
MCP Queen is a public discovery and evidence service for Model Context Protocol servers. It publishes dated operational observations, tool metadata, and separate Trust Receipts so developers and agents can inspect evidence before deciding what to connect.
An MCP Queen operational grade is not a security, privacy, data-quality, or compliance certification. Missing evidence is unaudited, not safe.
Use the hosted endpoint
The public Streamable HTTP endpoint requires no account for rate-limited evaluation:
https://mcpqueen.com/mcp
It exposes six read-only discovery/evidence tools and one additive feedback tool:
search_serverssearch_toolslist_gradesget_server_gradeget_trust_receiptsearch_trust_evidencesubmit_feedback— writes only to a quarantined review queue
For human-readable setup and current service limits, use mcpqueen.com/connect.
Claude Code
claude mcp add --transport http mcpqueen https://mcpqueen.com/mcp
Direct protocol examples
The model-free examples under examples/clients call the
hosted endpoint directly:
node examples/clients/node-http.mjs "GitHub issue triage"
The Python version uses the official MCP SDK. Additional examples show bounded
integration with LangChain, LlamaIndex, Cloudflare Agents, Hugging Face, and
the OpenAI Responses API. Agent examples allowlist only the six read-only
tools; submit_feedback is excluded from automatic model access.
Optional local stdio bridge
This repository contains a small zero-dependency stdio bridge for clients that
cannot connect to a remote Streamable HTTP endpoint directly. The bridge does
not contain MCP Queen's hosted implementation or evidence corpus; it forwards
JSON-RPC messages to https://mcpqueen.com/mcp.
git clone https://github.com/mcpqueen/mcpqueen.git
cd mcpqueen
npm ci
npm start
To point the bridge at another compatible endpoint during local testing, set
MCPQUEEN_MCP_URL in the process environment.
Docker is also supported:
docker build -t mcpqueen-bridge .
docker run --rm -i mcpqueen-bridge
What this public repository contains
- registry metadata:
server.jsonandglama.json - the hosted-endpoint stdio bridge:
server.mjs - model-free and framework examples:
examples - public architecture and trust boundaries:
docs/architecture.md - deterministic tests and read-only CI
The production Worker, deployment configuration, evidence database, submission packages, operational records, and private source history are not part of this public developer surface. This repository is not a production deployment source.
Verify locally
npm ci
npm test
The tests exercise the bridge against a local mock endpoint and verify that public documentation and package scripts reference files that are actually in this repository.
License and support
Code in this repository is available under the MIT License. Product documentation, privacy, terms, and support are available from mcpqueen.com.
Comments
New to MCP?
From what the protocol is to installing your first server, these answers cover most first questions.
An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.