whoisthere

whoisthere is a Model Context Protocol (MCP) server written in Go that enables Large Language Models (LLMs) to check domain name availability and discover available Top-Level Domains (TLDs).

Tools

This server exposes two main tools:

DomainAvailable

Checks if a specific domain name with a TLD is available for registration.

• Input:
  • domain (string): The domain to check (e.g., "example.com"). Can include http/https prefix.
• Output:
  • Available (boolean): True if available.
  • Domain (string): The checked domain.

AvailableDomainTLDFinder

Given a domain name stem (without TLD), checks availability across multiple TLDs to find open registration options.

• Input:
  • domain (string): The domain stem to check (e.g., "example" for "example.com"). Should not include a TLD.
  • only_popular (boolean, optional): If true, only checks popular TLDs (com, net, org, etc.).
  • only_country (boolean, optional): If true, only checks country-code TLDs (us, uk, ca, etc.).
• Output:
  • AvailableDomains (array of strings): List of full domain names available for registration.
  • PopularDomains (array of strings): List of available domains from the "popular" category.

Installation & Usage

Prerequisites

• Go 1.23 or higher
• Make

Build

To build the project:

make build

Docker

You can also build and run the server using Docker.

Build the image:

docker build -t whoisthere .

Run the container:

docker run -p 8080:8080 whoisthere

You can also use the pre-built image from GitHub Container Registry:

docker run -p 8080:8080 ghcr.io/jaysongiroux/whoisthere:latest

Docker Compose:

You can also run the server using Docker Compose. Create a docker-compose.yml file:

version: '3.8'

services:
  whoisthere:
    image: ghcr.io/jaysongiroux/whoisthere:latest
    container_name: whoisthere
    restart: unless-stopped
    ports:
      - "8080:8080"
    environment:
      - HOST=:8080

Run

To run the server locally (without Docker):

make run

By default, the server listens on localhost:8080.

Configuration

You can configure the host and port using either command-line flags or environment variables.

Using Flags:

./bin/whoisthere --host localhost:9000

Using Environment Variables:

HOST=localhost:9000 ./bin/whoisthere

Integration

Add this server to your MCP client configuration (e.g., mcp.json):

{
  "mcpServers": {
    "whoisthere": {
      "url": "http://localhost:8080/sse"
    }
  }
}