MCP Test Client

by willccbb

125 stars

457 downloads

Not rated

GitHub

About

An MCP Server that's also an MCP Client. Useful for letting Claude develop and test MCPs without needing to reset the application.

Details

Author: willccbb
GitHub stars: 125
Downloads: 457
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 Test Client

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 test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

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 test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

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 test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

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 test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

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 test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

From the repository

Install dependencies with npm install, build with npm run build, then either register the server with Claude via the claude-mcp-local script and use its exposed tools, or run the CLI interface with npm run test for an interactive testing menu.

Claude Desktop / Cursor

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

{
    "mcpServers": {
        "mcp test client": {
            "mcp-client-server": {
                "command": "node",
                "args": [
                    "dist/test-runner.js"
                ]
            }
        }
    }
}

McpServers

{
    "mcp-client-server": {
        "command": "node",
        "args": [
            "dist/test-runner.js"
        ]
    }
}

MCP Test Client

An MCP middleware that acts as both a server (to Claude) and a client (to servers under test) for testing MCP servers during development.

Architecture

The MCP Test Client has a dual role:
- It's a server registered with Claude that exposes tools for testing
- It's a client that connects to and tests other MCP servers

┌─────────────┐          ┌───────────────────┐          ┌────────────────┐
│             │  Tools   │                   │  Client  │                │
│   Claude    │─────────>│  MCP Test Client  │─────────>│  Server Under  │
│             │          │                   │          │     Test       │
└─────────────┘          └───────────────────┘          └────────────────┘

This architecture lets you test MCP servers without registering them directly with Claude.

Features

- Deploy MCP servers to test environments
- Call individual tools with custom arguments
- Run automated test suites
- View server logs
- Test servers before formal registration with Claude

Implementation

The MCP Test Client is implemented with:

- Process Management: Spawns and manages MCP server processes
- MCP SDK Client: Uses the official MCP SDK to communicate with servers
- Custom Transport: Implements a custom transport for stdio communication
- Test Execution: Runs tests and validates responses
- CLI Interface: Provides an interactive testing interface

The current implementation is Phase 1 of the design plan, with future enhancements planned for Phases 2 and 3.

Installation

```bash

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About

Details

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Setting up with Highlight

From the repository

Claude Desktop / Cursor

McpServers

MCP Test Client

Architecture

Features

Implementation

Installation

Install

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