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MCP Hello World - MCP Server Mock for Testing

@lobehub

Repository

Basic information

Category

Developer Tools

License

MIT

Transports

stdio

Author

lobehub

About MCP Hello World - MCP Server Mock for Testing

A simple Hello World MCP server for CI/CD test

MCP Hello World - MCP Server Mock for Testing config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "mcp-hello-world": {
      "command": "npx",
      "args": [
        "mcp-hello-world"
      ]
    }
  }
}

MCP Hello World - MCP Server Mock for Testing tools

3

Echoes back a message with 'Hello' prefix

Lists all available tools and methods

Adds two numbers

Overview

What is MCP Hello World - MCP Server Mock for Testing?

A minimal Model Context Protocol (MCP) server implemented in TypeScript, designed as a Test Double or Mock Server for unit and integration testing of MCP client code. It provides a lightweight, controllable, and predictable test environment.

How to use MCP Hello World - MCP Server Mock for Testing?

Install as a dev dependency (pnpm add --save-dev mcp-hello-world or bun add --dev mcp-hello-world). Run manually in STDIO mode (npx mcp-hello-world) or HTTP/SSE mode (build then pnpm start:http). Programmatically start and stop the server within test frameworks like Jest or Vitest.

Key features of MCP Hello World - MCP Server Mock for Testing

  • Minimal MCP server mock for testing
  • Supports both STDIO and HTTP/SSE transport protocols
  • Provides echo and debug tools with fixed behaviors
  • Offers static and dynamic greeting resources
  • Fast startup and lightweight dependencies

Use cases of MCP Hello World - MCP Server Mock for Testing

  • Unit testing MCP client code in isolation
  • Integration testing client behavior over STDIO or HTTP/SSE
  • Debugging MCP client interactions with a predictable server

Frequently asked questions

1

Is this server suitable for production use?

No, it is explicitly not suitable for production environments or general-purpose deployment.

2

What transport protocols does it support?

It supports both STDIO and HTTP/SSE MCP transport protocols.

3

What resources and tools does the server provide?

It provides resources (`hello://world`, `greeting://{name}`), tools (`echo`, `debug`), and a prompt (`helpful-assistant`).

4

What are the runtime requirements?

The server requires Node.js and is installed via npm/pnpm/bun as a TypeScript package.

5

Does it support programmatic control in tests?

Yes, it can be programmatically started and stopped within test frameworks (Jest, Vitest, Mocha) using `spawn` for STDIO or HTTP modes.

Comments

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