mcpField
M
MCP Server Scanner

MCP Server Scanner

Local
github.com/m-q-tSecurity0Updated 78w ago
Repository

About MCP Server Scanner

MCP Server Scanner is a prototype CLI for detecting MCP servers accessible over the internet through Server-Sent Events (SSE) and listing their tools. It is intended for security research into exposed servers and their security measures; the project notes that it is not production-ready.

Key features

  1. 01Find MCP servers using SSE
  2. 02Enumerate available tools
  3. 03Accept a base HTTP URL
  4. 04Configure a connection timeout

Use cases

  1. 01Identify internet-exposed MCP servers
  2. 02Review tools exposed by a server
  3. 03Probe server security measures

MCP support

It connects to MCP servers using Server-Sent Events (SSE) and enumerates their available tools.

#mcp-server-scanner#mcp-servers#security

Configuration

Local server config is the same for every client. Copy it into your client’s MCP config file.

No install method listed yet

We haven’t collected a package or remote endpoint for this server. Follow the instructions in the project README.

Repository

Tools

No tool list yet

Local servers expose tools only once running on your machine, and the maintainer has not provided a tool list.

Details

From the project README

MCP Server Scanner

Overview

This tool detects MCP Servers running over Server-Sent Events (SSE) and enumerates its available tools.

⚠️ IMPORTANT: This is a quick prototype and is NOT production-ready. The code is intentionally sloppy as it was built for rapid feedback and as such it may miss some edge cases..

Purpose

This tool was created to test hypotheses about MCP Servers exposed to the internet. With ongoing discussions around MCP Authorization, it provides a way to:

  • Identify internet-exposed MCP servers
  • Determine if they implement proper security measures

Usage

Provide the base HTTP URL with an optional timeout parameter:

./mcp-scanner -url http://REDACTED -timeout 5                                       
2025/04/29 12:16:56 Initiating connection
2025/04/29 12:16:56 Processing SSE stream
2025/04/29 12:16:56 Waiting for messages
2025/04/29 12:16:56 Sending message: /messages?sessionId=4ac0f3be-619e-4fc2-8b5b-cda90df2392c
2025/04/29 12:16:56 Sent message: /messages?sessionId=4ac0f3be-619e-4fc2-8b5b-cda90df2392c
2025/04/29 12:16:56 Received message: /messages?sessionId=4ac0f3be-619e-4fc2-8b5b-cda90df2392c
2025/04/29 12:16:56 Found messages endpoint: messages?sessionId=4ac0f3be-619e-4fc2-8b5b-cda90df2392c
2025/04/29 12:16:56 Successfully got the messagesEndpoint: messages?sessionId=4ac0f3be-619e-4fc2-8b5b-cda90df2392c
2025/04/29 12:16:56 Sending message: {"result":{"protocolVersion":"2024-11-05","capabilities":{"tools":{},"resources":{}},"serverInfo":{"name":"mcp-sse-server","version":"1.0.0"}},"jsonrpc":"2.0","id":0}
2025/04/29 12:16:56 Sent message: {"result":{"protocolVersion":"2024-11-05","capabilities":{"tools":{},"resources":{}},"serverInfo":{"name":"mcp-sse-server","version":"1.0.0"}},"jsonrpc":"2.0","id":0}
2025/04/29 12:16:56 Received message: {"result":{"protocolVersion":"2024-11-05","capabilities":{"tools":{},"resources":{}},"serverInfo":{"name":"mcp-sse-server","version":"1.0.0"}},"jsonrpc":"2.0","id":0}
2025/04/29 12:16:56 Sending message: {"result":{"tools":[{"name":"add","inputSchema":{"type":"object","properties":{"a":{"type":"number"},"b":{"type":"number"}},"required":["a","b"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}},{"name":"search","inputSchema":{"type":"object","properties":{"query":{"type":"string"},"count":{"type":"number"}},"required":["query"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}}]},"jsonrpc":"2.0","id":1}
2025/04/29 12:16:56 Sent message: {"result":{"tools":[{"name":"add","inputSchema":{"type":"object","properties":{"a":{"type":"number"},"b":{"type":"number"}},"required":["a","b"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}},{"name":"search","inputSchema":{"type":"object","properties":{"query":{"type":"string"},"count":{"type":"number"}},"required":["query"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}}]},"jsonrpc":"2.0","id":1}
2025/04/29 12:16:56 Received message: {"result":{"tools":[{"name":"add","inputSchema":{"type":"object","properties":{"a":{"type":"number"},"b":{"type":"number"}},"required":["a","b"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}},{"name":"search","inputSchema":{"type":"object","properties":{"query":{"type":"string"},"count":{"type":"number"}},"required":["query"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}}]},"jsonrpc":"2.0","id":1}
2025/04/29 12:16:56 Tools: {"result":{"tools":[{"name":"add","inputSchema":{"type":"object","properties":{"a":{"type":"number"},"b":{"type":"number"}},"required":["a","b"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}},{"name":"search","inputSchema":{"type":"object","properties":{"query":{"type":"string"},"count":{"type":"number"}},"required":["query"],"additionalProperties":false,"$schema":"http://json-schema.org/draft-07/schema#"}}]},"jsonrpc":"2.0","id":1}

Comments

Markdown supported

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.