oob-probe-mcp-server

OOB probe MCP server with TCP/HTTP listeners, log access, and ngrok tunnels.

Features

• TCP tools for reverse shell testing: listen, read logs, and send data to active connections.
• HTTP tools for SSRF testing: receive requests and inspect full request logs.
• ngrok integration for public endpoints on both TCP and HTTP.
• Optional desktop notifications for new connections/requests.

Tools

TCP:

listen_tcp, send_tcp, read_tcp, close_tcp

HTTP:

listen_http, read_http, close_http

Other:

status

Setup

Install the server:

go install github.com/lambdasawa/oob-probe-mcp-server@latest

This server uses ngrok to expose local listeners. Configure an auth token first:

ngrok config add-authtoken <YOUR_TOKEN>

The token is read from your ngrok config file (typically ~/.config/ngrok/ngrok.yml).

MCP config example

Example .mcp.json entry:

{
  "mcpServers": {
    "oob-probe": {
      "command": "oob-probe-mcp-server",
      "env": {
        "OOB_PROBE_ENABLE_DESKTOP_NOTIFICATION": "false"
      }
    }
  }
}

Desktop notifications

Desktop notifications are enabled by default. Disable them by setting:

OOB_PROBE_ENABLE_DESKTOP_NOTIFICATION=false

Intended use

This tool is developed for research purposes in CTFs and controlled lab environments. Use it only against systems and targets you are authorized to test.