Code Runner MCP Server: Seamless Scaling & Instant Environments

Code Runner MCP Server mirrors environments, scales code execution seamlessly, and streamlines deployments for faster, reliable dev ops. Effortless, powerful.

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About Code Runner MCP Server

What is Code Runner MCP Server: Seamless Scaling & Instant Environments?

Code Runner MCP Server is a versatile tool designed to execute code snippets across multiple programming languages with minimal setup. It provides instant execution environments and seamless scaling capabilities, enabling developers to run scripts efficiently in platforms like VS Code and Claude Desktop. Supported languages include JavaScript, Python, PHP, Ruby, and over 30 others, ensuring broad compatibility for diverse workflows.

How to Use Code Runner MCP Server: Seamless Scaling & Instant Environments?

Integration is straightforward via three primary methods: npx for direct package execution, Docker for containerized deployment, or Smithery for automated remote container setup. Configuration requires updating platform-specific JSON files with server parameters, while Windows users may need workarounds like bunx or cmd execution to resolve connection issues.

Code Runner MCP Server Features

Key Features of Code Runner MCP Server: Seamless Scaling & Instant Environments?

Multi-Language Support: Execute scripts in JavaScript, Python, Ruby, and dozens of other languages natively.
Instant Environments: Spins up temporary execution contexts on-demand without manual configuration.
Seamless Scaling: Leverages Docker and cloud-based containers (via Smithery) for scalable deployment.
Platform Integration: Works natively with VS Code and Claude Desktop through MCP protocol.
Security-first Design: Runs code in isolated environments to prevent system interference.

Use Cases of Code Runner MCP Server: Seamless Scaling & Instant Environments?

Common applications include:

Quick prototyping of code snippets during development
Automated script testing in CI/CD pipelines
Language interpreter verification and debugging
Creating sandboxed environments for untrusted code execution
Powering AI-driven code execution in platforms like Claude Desktop

Code Runner MCP Server FAQ

FAQ from Code Runner MCP Server: Seamless Scaling & Instant Environments?

Q: Does this require language-specific installations?
The server requires compilers/interpreters for target languages to be present in the system PATH. For example, Python execution needs a valid Python installation.

Q: How to troubleshoot Windows connection issues?
Use bunx as an alternative to npx, or configure command execution via cmd shell as shown in the documentation.

Q: Can I customize execution parameters?
Advanced configurations are possible through server parameter overrides in platform-specific JSON files. Full customization options are documented in the source code repository.

Content

Code Runner MCP Server

MCP Server for running code snippet and show the result.

It supports running multiple programming languages: JavaScript, PHP, Python, Perl, Perl 6, Ruby, Go, Lua, Groovy, PowerShell, BAT/CMD, BASH/SH, F# Script, C# Script, VBScript, TypeScript, CoffeeScript, Scala, Swift, Julia, Crystal, OCaml Script, R, AppleScript, Elixir, Clojure, Racket, Scheme, AutoHotkey, AutoIt, Kotlin Script, Dart, Haskell, Ni, Lisp, Kit, V, SCSS, Sass. Full list could be seen here in constants.ts.

Setup

npx for VS Code

Configuration in settings.json:

{
  "mcp": {
    "inputs": [],
    "servers": {
      "mcp-server-code-runner": {
        "command": "npx",
        "args": [
          "-y",
          "mcp-server-code-runner"
        ],
      }
    }
  }
}

npx for Claude Desktop

Configuration in claude_desktop_config.json:

{
  "mcpServers": {
    "mcp-server-code-runner": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-server-code-runner"
      ],
    }
  }
}

Docker

Use VS Code as example. Configuration in settings.json:

{
  "mcp": {
    "inputs": [],
    "servers": {
      "mcp-server-code-runner": {
        "command": "docker",
        "args": [
          "run",
          "--rm",
          "-i",
          "formulahendry/mcp-server-code-runner"
        ]
      }
    }
  }
}

Installing via Smithery

NOTE: This will run Code Runner MCP Server in a remote Container environment hosted by Smithery.

To install Code Runner MCP Server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @formulahendry/mcp-server-code-runner --client claude

npx issue on Widnows

On Windows, MCP servers may fail to connect with npx.

You could try below two workarounds:

use bunx

Install Bun.
In configuration, change npx with bunx.

use cmd

Below is VS Code configuration in settings.json:

{
  "mcp": {
    "inputs": [],
    "servers": {
      "mcp-server-code-runner": {
        "command": "cmd",
        "args": [
          "/c",
          "npx",
          "-y",
          "mcp-server-code-runner"
        ],
      }
    }
  }
}

Usage

Before using Code Runner MCP Server, please make sure interpreter or compiler of the programming language you want to run is set in PATH environment variable.

Try below prompts in the application which has configured Code Runner MCP Server:

Run the JavaScript Code: console.log(5+6)
Where is temporary folder in my OS? Use run-code tool
How many CPUs do I have in my machine? Use run-code tool

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