Piston MCP Server

piston-mcp is an MCP server that allows LLMs to connect to and execute code using Piston.

Warning

As of Feb 15, 2026, Piston API is no longer publicly available and requires an authorization token. This means piston-mcp will no longer work with the publicly hosted instance of Piston.

Installation

You can try out piston-mcp locally without cloning it.

Install uv

To try out piston-mcp you'll need to install uv:

# On MacOS and Linux
curl -LsSf https://astral.sh/uv/install.sh | sh
# On Windows
powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

Install MCP Client

You will also need to download an MCP client to connect to piston-mcp, such as Claude Desktop.

Update MCP Client Configuration

Update the MCP client's configuration with the following configuration to connect to piston-mcp:

{
  "mcpServers": {
    "piston": {
      "command": "uv",
      "args": [
        "tool",
        "run",
        "--from",
        "git+https://github.com/alvii147/piston-mcp.git@main",
        "piston_mcp"
      ]
    }
  }
}

For Claude Desktop, the configuration file is usually found in:

# On MacOS and Linux
~/Library/Application\ Support/Claude/claude_desktop_config.json
# On Windows
%APPDATA%\Claude\claude_desktop_config.json

Usage

Once you've followed the steps above, your MCP client should be able to run code for you:

Acknowledgements

• Piston
• Claude.ai