API Tester MCP Server

This is a Model Context Protocol (MCP) server that allows Claude to make API requests on your behalf. It provides tools for testing various APIs, including a dedicated integration with OpenAI’s APIs.

Features

• Make HTTP requests (GET, POST, PUT, DELETE) to any API
• Test OpenAI’s GPT models without sharing your API key in the chat
• Generate images with DALL-E
• Properly formatted responses for easy reading

Setup

Prerequisites

• Python 3.10 or higher
• MCP SDK 1.2.0 or higher

Installation

1. Install the required dependencies:

pip install "mcp[cli]" httpx python-dotenv

2. Set your OpenAI API key using one of these methods:

Option 1: Environment Variables

# On Windows (PowerShell)
$env:OPENAI_API_KEY = "your-api-key"

# On Windows (Command Prompt)
set OPENAI_API_KEY=your-api-key

# On macOS/Linux
export OPENAI_API_KEY="your-api-key"

Option 2: Using a .env File (Recommended)

Create a .env file in the project directory (copy from .env.example):

OPENAI_API_KEY=your_openai_api_key_here

Running the Server

python main.py

Using with Claude

Once your server is running, you can connect it to Claude for Desktop by configuring it in the Claude Desktop config file.

Example Prompts

General API Testing

Use the get_request tool to fetch data from https://jsonplaceholder.typicode.com/posts/1

Use the post_request tool to send data to https://jsonplaceholder.typicode.com/posts with this JSON body: {"title": "Test Post", "body": "This is a test", "userId": 1}

Using OpenAI Tools

Use the openai_chat_completion tool with:
prompt: "Write a short poem about artificial intelligence"
system_message: "You are a helpful assistant that writes creative poetry"
model: "gpt-4"

Use the openai_image_generation tool with:
prompt: "A futuristic city with flying cars and tall glass buildings at sunset"
size: "1024x1024"

Available Tools

General API Tools

• get_request: Make GET requests to any URL
• post_request: Make POST requests with JSON bodies
• put_request: Make PUT requests with JSON bodies
• delete_request: Make DELETE requests

OpenAI-Specific Tools

• openai_chat_completion: Generate text using OpenAI’s chat models
• openai_image_generation: Generate images using DALL-E

Security Notes

• Your OpenAI API key is stored in the server and not exposed in the chat
• API usage will count against your OpenAI quota and may incur charges
• For production use, always set the API key as an environment variable or use a .env file
• The .env file is included in .gitignore to prevent accidentally committing your API key