What is MCP Client?

MCP Client is a command-line application that connects to Model Context Protocol (MCP) servers, allowing Claude to discover and use tools provided by those servers. It requires Python 3.11 or higher and an Anthropic API key, and is intended for developers building tool-augmented workflows.

How to use MCP Client?

Clone the repository, install the dependencies (anthropic, mcp, python-dotenv) using pip or uv, and set your ANTHROPIC_API_KEY in a .env file. Then run the client with python client.py path/to/server_script.py (or .js for JavaScript servers).

Key features of MCP Client

- Interactive command-line interface
- Support for both Python and Node.js MCP servers
- Seamless integration with Claude’s tool-use capabilities
- Proper resource management and error handling
- Automated tool discovery and execution through the MCP protocol

Use cases of MCP Client

- Expose custom scripts or APIs as tools for Claude to use during conversations
- Build automated workflows where Claude orchestrates multiple external services
- Rapidly prototype and test MCP servers locally before deploying them
- Enable Claude to perform file operations, database queries, or other server-side actions

FAQ from MCP Client

What is an MCP server?

An MCP server is a program that exposes tools via the Model Context Protocol. MCP Client connects to such servers and lets Claude invoke those tools as part of its reasoning process.

What AI models does MCP Client support?

MCP Client works with Anthropic’s Claude through the Anthropic API. Other models are not supported out of the box.

Can I use JavaScript MCP servers?

Yes. The client accepts both .py and .js server scripts, so you can use Node.js-based MCP servers.

How long does the first response take?

The first response may take up to 30 seconds due to initialization. Subsequent requests are typically faster.

Do I need an API key to use MCP Client?

Yes, you must provide a valid Anthropic API key in a .env file. The client will not operate without it.