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Simple Hono MCP Server

Provides a lightweight MCP server exposing a factorize tool for prime factorization via MCP endpoints.

Installation

Add the following to your MCP client configuration file.

Configuration

{
  "mcpServers": {
    "aoki-collabo-simple-hono-mcp-server": {
      "url": "http://localhost:8787/mcp"
    }
  }
}

You deploy and run a lean MCP (Model Context Protocol) server that exposes remote procedure calls for context-aware tools, enabling clients to list and execute tools like factorization on demand. This server runs on Cloudflare Workers or locally during development, making it a lightweight bridge between MCP clients and your tool implementations.

How to use

Connect an MCP client to the server to list available tools and to invoke them. Use the default HTTP endpoint when the server is deployed, or run the CLI locally to test and develop. The server exposes a factorization tool that takes a number and returns its prime factors along with the number of division steps, and it also exposes standard MCP endpoints for listing tools and calling a tool by name.

How to install

Prerequisites you need before starting:

Node.js v18 or newer
A Cloudflare account if you plan to deploy
Git

Step-by-step commands

# Clone the repository
git clone <repository-url>
cd simple-mcp-server

# Install dependencies
npm install

# Run locally for development
npm run dev

# Run tests
npm test

# Deploy to Cloudflare (requires prior login step)
npx wrangler login
npm run deploy

What you’ll see locally

When running locally, the MCP endpoint is available at http://localhost:8787/mcp. You can use the tools by invoking MCP client calls to this endpoint to list tools and to request a factorization.

Notes on deployment and local use

Deployment targets the Cloudflare Workers environment. After deployment, access the MCP endpoint via your worker URL, for example https://<your-worker>.workers.dev/mcp. Local development uses the http://localhost:8787/mcp endpoint.

Troubleshooting

If the server fails to start locally, verify that Node.js v18+ is installed and that port 8787 is not in use. For deployment issues, ensure you are logged into Cloudflare with wrangler and that your environment variables (if any) are configured correctly for the worker.

Available tools

factorize

Factorize a positive integer into its prime factors and report the total number of division operations used during the process.