About Code Runner
Code Runner is an MCP server published by formulahendry in the Developer Tools category: code Runner MCP Server.
The repository has 242 stars and 34 forks, with the last commit 8 months ago. Six months or more without a commit doesn't mean the server is broken, but check the open issues before depending on it in production.
Install
git clone https://github.com/formulahendry/mcp-server-code-runnerThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
Tools (1)
run-codeRun code snippet and return the result.
Parameters not published.
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Security checks
Static checks derived from the repository yesterday. Heuristics on the source, not an audit.
- ✓README presentThe repository ships documentation.
- ✓License declaredUsable under a stated license.
- !Tests presentNo tests found. Behaviour changes may go unnoticed between versions.
- ✓Dependencies pinnedA lockfile pins dependency versions.
- !No dynamic code executionSource scan found eval or shell execution. Review how tool inputs reach it before granting credentials.
- !Scoped permissionsDoesn't declare a permission scope. Assume it can do anything its process can.
README
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!
README fetched from the repository yesterday. The original is authoritative.