Summary
The Code Runner MCP Server enables execution of code snippets in over 40 programming languages including JavaScript, Python, Go, Ruby, Rust, and many others, providing output results directly through the Model Context Protocol. The server solves the problem of testing and running code without leaving an AI interface, supporting languages from common choices like Python and JavaScript to specialized ones like Julia, Haskell, and Clojure. It can be deployed via npx or Docker and integrates with VS Code and Claude Desktop.
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
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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
Install the Code Runner MCP server in VS Code using below buttons:
-VS_Code-0098FF){kind=icon}
-VS_Code_Insiders-24bfa5){kind=icon}
Alternatively, you can add configuration in settings.json:
{
"mcp": {
"inputs": [],
"servers": {
"mcp-server-code-runner": {
"command": "npx",
"args": [
"-y",
"mcp-server-code-runner@latest"
],
}
}
}
}
npx for Claude Desktop
Configuration in claude_desktop_config.json:
{
"mcpServers": {
"mcp-server-code-runner": {
"command": "npx",
"args": [
"-y",
"mcp-server-code-runner@latest"
],
}
}
}
Docker
Use VS Code as example. Install the Code Runner MCP server in VS Code using below buttons:
-VS_Code-0098FF){kind=icon}
-VS_Code_Insiders-24bfa5){kind=icon}
Alternatively, you can add configuration in settings.json:
{
"mcp": {
"inputs": [],
"servers": {
"mcp-server-code-runner": {
"command": "docker",
"args": [
"run",
"--rm",
"-i",
"formulahendry/mcp-server-code-runner"
]
}
}
}
}
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
npxwithbunx.
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@latest"
],
}
}
}
}
Run with Streamable HTTP Transport
npm install -g mcp-server-code-runner@latest
mcp-server-code-runner --transport http
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 toolHow many CPUs do I have in my machine? Use run-code tool
Build your own MCP Server
Want to build your own MCP Server? Try Yeoman Generator for MCP Server to create your MCP Server project!
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →