Python REPL MCP Server

This MCP server provides a Python REPL (Read-Eval-Print Loop) as a tool. It allows execution of Python code through the MCP protocol with a persistent session.

Setup

No setup needed! The project uses uv for dependency management.

Running the Server

Simply run:

uv run src/python_repl/server.py

Usage with Claude Desktop

Add this configuration to your Claude Desktop config file:

{
  "mcpServers": {
    "python-repl": {
      "command": "uv",
      "args": [
        "--directory",
        "/absolute/path/to/python-repl-server",
        "run",
        "mcp_python"
      ]
    }
  }
}

The server provides three tools:

execute_python: Execute Python code with persistent variables
- code: The Python code to execute
- reset: Optional boolean to reset the session
list_variables: Show all variables in the current session
install_package: Install a package from pypi

Examples

Set a variable:

a = 42

Use the variable:

print(f"The value is {a}")

List all variables:

# Use the list_variables tool

Reset the session:

# Use execute_python with reset=true

Contributing

Contributions are welcome! Please feel free to submit a Pull Request. Here are some ways you can contribute:

Report bugs
Suggest new features
Improve documentation
Add test cases
Submit code improvements

Before submitting a PR, please ensure:

Your code follows the existing style
You've updated documentation as needed
Maybe write some tests?

For major changes, please open an issue first to discuss what you would like to change.

Install Server

HTTP connection URL

security – no known vulnerabilities

license - permissive license

quality - confirmed to work

How are these scores calculated?

local-only server

The server can only run on the client's local machine because it depends on local resources.

Tools

A server that provides a persistent Python REPL environment through the MCP protocol, allowing execution of Python code, variable management, and package installation.

Related Resources

Reddit Discussion about this server

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