MCP Queen

Search MCP Tools

search_tools

Read-only

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

TableJSON Schema

Name	Required	Description
`auth`	No	Filter by authentication state (default any)
`limit`	No	Max matching tools (default 15, max 40)
`query`	Yes	Capability, data type, or keyword to match against tool names and descriptions
`category`	No	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`	No	Worst acceptable live server grade
`max_latency_ms`	No	Maximum measured initialize latency in milliseconds

Output Schema

TableJSON Schema

Name	Required	Description	Default
`message`	No
`results`	Yes
`safety_notice`	Yes
`feedback_reminder`	Yes
`interpreted_terms`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedAug 8, 2026

addedOutput schema / properties / safety_notice
```
Added value: +{
+  "type": "string"
+}
```

changedOutput schema / required

Previous value: -[
-  "interpreted_terms",
-  "feedback_reminder",
-  "results"
-]New value: +[
+  "safety_notice",
+  "interpreted_terms",
+  "feedback_reminder",
+  "results"
+]

Changed1 schema field changedJul 29, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": false,
+  "properties": {
+    "feedback_reminder": {
+      "type": "string"
+    },
+    "interpreted_terms": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "message": {
+      "type": "string"
+    },
+    "results": {
+      "items": {
+        "additionalProperties": true,
+        "properties": {
+          "category": {
+            "type": "string"
+          },
+          "evidence_page": {
+            "type": "string"
+          },
+          "grade": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "has_schema": {
+            "type": "boolean"
+          },
+          "latency_ms": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "protocol_access": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "provisional": {
+            "type": [
+              "number",
+              "boolean",
+              "null"
+            ]
+          },
+          "referral_link": {
+            "type": "string"
+          },
+          "remote_type": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "remote_url": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "score": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "server_name": {
+            "type": "string"
+          },
+          "tool_description": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "tool_name": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "server_name",
+          "tool_name",
+          "has_schema",
+          "category",
+          "evidence_page",
+          "referral_link"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "interpreted_terms",
+    "feedback_reminder",
+    "results"
+  ],
+  "type": "object"
+}

Changed3 schema fields changedJul 15, 2026

addedInput schema / properties / auth

Added value: +{
+  "description": "Filter by authentication state (default any)",
+  "enum": [
+    "any",
+    "open",
+    "required"
+  ],
+  "type": "string"
+}

addedInput schema / properties / max_latency_ms

Added value: +{
+  "description": "Maximum measured initialize latency in milliseconds",
+  "type": "number"
+}

addedInput schema / properties / minimum_grade

Added value: +{
+  "description": "Worst acceptable live server grade",
+  "enum": [
+    "A",
+    "B",
+    "C",
+    "D",
+    "F"
+  ],
+  "type": "string"
+}

AddedJul 13, 2026

TDQS

A4.3/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and destructiveHint=false. The description adds meaningful context: it searches live data from tools/list and returns the server, grade, and remote endpoint. This goes beyond the safety annotations, though it doesn't mention rate limits or auth specifics.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact, front-loaded with the core purpose, and every sentence adds value—scope, usage examples, and return content. No fluff or redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a search tool with six parameters and an output schema, the description covers the core functionality, the object being searched (tools vs servers), typical queries, and the result structure. The output schema handles return details, so nothing critical is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so all six parameters are documented in the schema. The description provides usage examples but does not add additional meaning beyond what the schema already states, so a baseline of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it searches across actual tools exposed by MCP servers, with examples like 'get weather' and 'query postgres'. It explicitly contrasts with 'server metadata', distinguishing it from sibling tools such as search_servers.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly says 'Use this when you need a specific capability or data type' and provides concrete examples. It implies not for server metadata, but does not explicitly name alternative tools or state when not to use, so it falls short of a 5.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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