MCP Queen
The evidence layer for MCP: live operational grades plus Trust Receipts for every registry server.
Should I use this
Quality & Safety
A
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
~2,459Tokens (tool definitions)
~3.4 KBTypical response size
Moderate attention impact (1.92% of 128k context)
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"registry": {
"url": "https://mcpqueen.com/mcp"
}
}
}Remote endpoints
https://mcpqueen.com/mcpstreamable-httpWhat it can do
Tool inventory
Tools (7)
🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢search_servers(query, category, minimum_grade, auth, max_latency_ms, ...)
Search the MCP evidence registry using a natural multi-word task (e.g. 'reliable no-auth drug interaction server with citations'). Tokenizes and expands common synonyms, ranks metadata plus observed tool descriptions, and supports operational-grade/auth/latency/category filters. Use get_trust_receipt or search_trust_evidence for security, data, citation, claim, and response evidence.
Input Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Keyword or task to search name/title/description for"
},
"category": {
"type": "string",
"description": "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": {
"type": "string",
"enum": [
"A",
"B",
"C",
"D",
"F"
],
"description": "Worst acceptable live grade"
},
"auth": {
"type": "string",
"enum": [
"any",
"open",
"required"
],
"description": "Filter by authentication state (default any)"
},
"max_latency_ms": {
"type": "number",
"description": "Maximum measured initialize latency in milliseconds"
},
"limit": {
"type": "number",
"description": "Max results (default 10, max 25)"
}
},
"required": [
"query"
]
}Output Schema
{
"type": "object",
"properties": {
"safety_notice": {
"type": "string"
},
"interpreted_terms": {
"type": "array",
"items": {
"type": "string"
}
},
"feedback_reminder": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"name": {
"type": "string"
},
"title": {
"type": [
"string",
"null"
]
},
"description": {
"type": [
"string",
"null"
]
},
"remote_url": {
"type": [
"string",
"null"
]
},
"remote_type": {
"type": [
"string",
"null"
]
},
"category": {
"type": "string"
},
"grade": {
"type": [
"string",
"null"
]
},
"score": {
"type": [
"number",
"null"
]
},
"provisional": {
"type": [
"number",
"boolean",
"null"
]
},
"latency_ms": {
"type": [
"number",
"null"
]
},
"tool_count": {
"type": [
"number",
"null"
]
},
"protocol_access": {
"type": [
"string",
"null"
]
},
"evidence_page": {
"type": "string"
},
"referral_link": {
"type": "string"
}
},
"required": [
"name",
"category",
"evidence_page",
"referral_link"
],
"additionalProperties": true
}
},
"message": {
"type": "string"
}
},
"required": [
"safety_notice",
"interpreted_terms",
"feedback_reminder",
"results"
],
"additionalProperties": false
}🟢search_tools(query, category, minimum_grade, auth, max_latency_ms, ...)
Search across the actual tools that graded MCP servers expose (their tool names and descriptions, captured live from tools/list) — not just server metadata. Use this when you need a specific capability or data type, e.g. 'get weather', 'query postgres', 'device recall', 'FDA 510k'. Returns the matching tools with the server that offers each, its grade, and the remote endpoint so you can connect directly.
Input Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Capability, data type, or keyword to match against tool names and descriptions"
},
"category": {
"type": "string",
"description": "Optional server-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": {
"type": "string",
"enum": [
"A",
"B",
"C",
"D",
"F"
],
"description": "Worst acceptable live server grade"
},
"auth": {
"type": "string",
"enum": [
"any",
"open",
"required"
],
"description": "Filter by authentication state (default any)"
},
"max_latency_ms": {
"type": "number",
"description": "Maximum measured initialize latency in milliseconds"
},
"limit": {
"type": "number",
"description": "Max matching tools (default 15, max 40)"
}
},
"required": [
"query"
]
}Output Schema
{
"type": "object",
"properties": {
"safety_notice": {
"type": "string"
},
"interpreted_terms": {
"type": "array",
"items": {
"type": "string"
}
},
"feedback_reminder": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"server_name": {
"type": "string"
},
"tool_name": {
"type": "string"
},
"tool_description": {
"type": [
"string",
"null"
]
},
"has_schema": {
"type": "boolean"
},
"category": {
"type": "string"
},
"grade": {
"type": [
"string",
"null"
]
},
"score": {
"type": [
"number",
"null"
]
},
"provisional": {
"type": [
"number",
"boolean",
"null"
]
},
"protocol_access": {
"type": [
"string",
"null"
]
},
"latency_ms": {
"type": [
"number",
"null"
]
},
"remote_url": {
"type": [
"string",
"null"
]
},
"remote_type": {
"type": [
"string",
"null"
]
},
"evidence_page": {
"type": "string"
},
"referral_link": {
"type": "string"
}
},
"required": [
"server_name",
"tool_name",
"has_schema",
"category",
"evidence_page",
"referral_link"
],
"additionalProperties": true
}
},
"message": {
"type": "string"
}
},
"required": [
"safety_notice",
"interpreted_terms",
"feedback_reminder",
"results"
],
"additionalProperties": false
}🟢list_grades(limit)
List the top graded MCP servers from the mcpqueen registry (deterministic probe grades with evidence). Returns grade, score 0-100, latency, tool count and auth state per server.
Input Schema
{
"type": "object",
"properties": {
"limit": {
"type": "number",
"description": "Max servers to return (default 25, max 100)"
}
}
}Output Schema
{
"type": "object",
"properties": {
"safety_notice": {
"type": "string"
},
"returned": {
"type": "number"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"server_name": {
"type": "string"
},
"grade": {
"type": "string"
},
"score": {
"type": "number"
},
"provisional": {
"type": [
"number",
"boolean"
]
},
"latency_ms": {
"type": [
"number",
"null"
]
},
"tool_count": {
"type": [
"number",
"null"
]
},
"protocol_access": {
"type": [
"string",
"null"
]
},
"probed_at": {
"type": "string"
}
},
"required": [
"server_name",
"grade",
"score",
"provisional",
"probed_at"
],
"additionalProperties": true
}
}
},
"required": [
"safety_notice",
"returned",
"results"
],
"additionalProperties": false
}🟢get_server_grade(name)
Get the full grade and verbatim probe evidence for one MCP server, by its official registry name (e.g. 'com.healthai/radar').
Input Schema
{
"type": "object",
"properties": {
"name": {
"type": "string",
"description": "Registry server name"
}
},
"required": [
"name"
]
}Output Schema
{
"type": "object",
"properties": {
"server_name": {
"type": "string"
},
"grade": {
"type": "string"
},
"score": {
"type": "number"
},
"provisional": {
"type": [
"number",
"boolean"
]
},
"latency_ms": {
"type": [
"number",
"null"
]
},
"tool_count": {
"type": [
"number",
"null"
]
},
"protocol_access": {
"type": [
"string",
"null"
]
},
"probed_at": {
"type": "string"
},
"description": {
"type": [
"string",
"null"
]
},
"remote_url": {
"type": [
"string",
"null"
]
},
"repo_url": {
"type": [
"string",
"null"
]
},
"version": {
"type": [
"string",
"null"
]
},
"reachable": {
"type": [
"number",
"boolean",
"null"
]
},
"evidence": {
"anyOf": [
{
"type": "array",
"items": {
"type": "object",
"additionalProperties": true
}
},
{
"type": "object",
"additionalProperties": true
},
{
"type": "null"
}
]
}
},
"required": [
"server_name",
"grade",
"score",
"provisional",
"probed_at"
],
"additionalProperties": true
}🟢get_trust_receipt(name)
Get one MCP server's complete evidence receipt: operational grade, deterministic security/data-integrity/citation/claim observations, and reviewed real-usage field reports. Missing observations are explicitly unaudited, never treated as a pass.
Input Schema
{
"type": "object",
"properties": {
"name": {
"type": "string",
"description": "Official registry server name"
}
},
"required": [
"name"
]
}Output Schema
{
"type": "object",
"properties": {
"safety_notice": {
"type": "string"
},
"server": {
"type": "object",
"additionalProperties": true
},
"trust_dimensions": {
"type": "array",
"items": {
"type": "string"
}
},
"audit_state": {
"type": "string",
"enum": [
"observations_published",
"unaudited"
]
},
"interpretation": {
"type": "string"
},
"observations": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": true
}
},
"response_benchmarks": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": true
}
},
"reviewed_field_reports": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": true
}
},
"evidence_page": {
"type": "string"
}
},
"required": [
"safety_notice",
"server",
"trust_dimensions",
"audit_state",
"interpretation",
"observations",
"response_benchmarks",
"reviewed_field_reports",
"evidence_page"
],
"additionalProperties": false
}🟢search_trust_evidence(query, dimension, status, limit)
Search published MCP trust evidence and reviewed real-usage field reports. Use for questions such as which servers expose citations, have access caveats, make unverifiable corpus claims, or show security concerns. Returns verbatim observations with dates and source type, not a synthetic trust score.
Input Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Evidence, claim, source, capability, caveat, or server keyword"
},
"dimension": {
"type": "string",
"enum": [
"any",
"security",
"data_integrity",
"citation_quality",
"claim_verification",
"field_report"
]
},
"status": {
"type": "string",
"enum": [
"any",
"observed",
"pass",
"concern",
"unverified",
"not_testable"
]
},
"limit": {
"type": "number",
"description": "Max evidence items (default 20, max 50)"
}
},
"required": [
"query"
]
}Output Schema
{
"type": "object",
"properties": {
"safety_notice": {
"type": "string"
},
"query": {
"type": "string"
},
"returned": {
"type": "number"
},
"interpretation": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"server_name": {
"type": "string"
},
"title": {
"type": [
"string",
"null"
]
},
"dimension": {
"type": "string"
},
"metric": {
"type": "string"
},
"status": {
"type": "string"
},
"value_text": {
"type": [
"string",
"null"
]
},
"evidence": {
"type": [
"string",
"null"
]
},
"source_type": {
"type": [
"string",
"null"
]
},
"sample_size": {
"type": [
"number",
"null"
]
},
"observed_at": {
"type": "string"
},
"evidence_page": {
"type": "string"
}
},
"required": [
"server_name",
"dimension",
"metric",
"status",
"observed_at",
"evidence_page"
],
"additionalProperties": true
}
}
},
"required": [
"safety_notice",
"query",
"returned",
"interpretation",
"results"
],
"additionalProperties": false
}🟡submit_feedback(server_name, report, agent_name)
Submit a field report about an MCP server you have actually used (what worked, what failed, surprising behavior). Reports are quarantined for human review and never auto-published.
Input Schema
{
"type": "object",
"properties": {
"server_name": {
"type": "string",
"description": "Official registry name of the server the report is about"
},
"report": {
"type": "string",
"description": "The field report, 20-2000 chars, specific and factual"
},
"agent_name": {
"type": "string",
"description": "Optional: which agent/client is reporting"
}
},
"required": [
"server_name",
"report"
]
}Output Schema
{
"type": "object",
"properties": {
"safety_notice": {
"type": "string"
},
"status": {
"type": "string",
"const": "quarantined"
},
"server_name": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"safety_notice",
"status",
"server_name",
"message"
],
"additionalProperties": false
}Community
Evidence
Recent observations
verifiedversion not recorded7 tools
verifiedversion not recorded7 tools