MCP Hello World - MCP Server Mock for Testing

by lobehub

22 stars

246 downloads

Not rated

GitHub

About

A minimal MCP server mock in TypeScript for testing MCP clients, supporting both STDIO and HTTP/SSE protocols.

Details

Author: lobehub
GitHub stars: 22
Downloads: 246
Categories: Developer Tools, Other

Setting up with Highlight

This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:

Download and install Highlight from highlightai.com/download
Navigate to the plugins tab and select "Add Custom Plugin"
Configure the plugin with the settings below

Plugin Name MCP Hello World - MCP Server Mock for Testing

Command (node, npx, python, etc.)

Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
Enable "Start Automatically" if you want the plugin to start when Highlight launches

Setting up with Cursor

Open Cursor's settings
Navigate to the MCP section
Click "Add new Global MCP server"
Copy and paste the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

Setting up with Claude Desktop

Open Claude Desktop's settings
Go to the Integrations tab
Click "Add MCP Server"
Use the configuration below based on your operating system

Note: Make sure Claude Desktop is running before attempting to connect.

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

Setting up with Windsurf

Open Windsurf's preferences
Go to the Integrations section
Click "Add MCP Integration"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

Setting up with Cline

Open Cline's settings
Navigate to the Integrations section
Click "Add MCP Server"
Copy and paste the configuration below based on your operating system

Note: Make sure to restart Cline after adding the configuration.

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

Setting up with Goose

Open Goose's preferences
Go to the Integrations tab
Select "MCP Servers"
Click "Add New Server"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

From the repository

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.

`echo`

Echoes back a message with 'Hello' prefix

`debug`

Lists all available tools and methods

`add`

Adds two numbers

Claude Desktop / Cursor

Paste into your MCP client config file to install this server.

{
    "mcpServers": {
        "mcp hello world - mcp server mock for testing": {
            "mcp-hello-world": {
                "command": "npx",
                "args": [
                    "mcp-hello-world"
                ]
            }
        }
    }
}

McpServers

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

MCP Hello World - MCP Server Mock for Testing

[![][npm-release-shield]][npm-release-link]
[![][npm-downloads-shield]][npm-downloads-link]
[![][github-action-test-shield]][github-action-test-link]
[![][github-action-release-shield]][github-action-release-link]

[github-action-release-link]: https://github.com/lobehub/mcp-hello-world/actions/workflows/release.yml
[github-action-release-shield]: https://img.shields.io/github/actions/workflow/status/lobehub/mcp-hello-world/release.yml?label=Release&logo=githubactions&logoColor=white&style=flat-square
[github-action-test-link]: https://github.com/lobehub/mcp-hello-world/actions/workflows/test.yml
[github-action-test-shield]: https://img.shields.io/github/actions/workflow/status/lobehub/mcp-hello-world/test.yml?label=Test&logo=githubactions&logoColor=white&style=flat-square
[npm-downloads-link]: https://www.npmjs.com/package/mcp-hello-world
[npm-downloads-shield]: https://img.shields.io/npm/dt/mcp-hello-world?label=Downloads&logo=npm&style=flat-square
[npm-release-link]: https://www.npmjs.com/package/mcp-hello-world
[npm-release-shield]: https://img.shields.io/npm/v/mcp-hello-world?logo=npm&style=flat-square

This is a minimal Model Context Protocol (MCP) server implemented in TypeScript, primarily intended to serve as a Test Double / Mock Server.

Core Purpose: To provide a lightweight, controllable, and predictable MCP server environment for unit testing or integration testing client code that needs to interact with an MCP server.

Note: This project is not suitable for production environments or deployment as a general-purpose MCP server.

Why Use `mcp-hello-world` in Tests?

When testing code related to MCP clients, you usually don't want to depend on a real, potentially complex, and unpredictably responsive AI backend service. Using mcp-hello-world as a test double offers several advantages:

1. Isolation: Focus your tests on client logic without worrying about network issues or the availability of the real server.
2. Predictability: The provided echo and debug tools have simple, fixed behaviors, making it easy to write assertions.
3. Speed: Fast startup and response times, suitable for frequent use in unit tests.
4. Lightweight: Few dependencies, easy to integrate into test environments.
5. Protocol Coverage: Supports both STDIO and HTTP/SSE MCP transport protocols, allowing you to test client behavior under different connection methods.

Installation

Add this package as a dev dependency to your project:

```bash

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About

Details

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Setting up with Highlight

From the repository

echo

debug

add

Claude Desktop / Cursor

McpServers

MCP Hello World - MCP Server Mock for Testing

Why Use mcp-hello-world in Tests?

Installation

Install

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