Code Runner MCP Server

by formulahendry Your server? Claim it

local only

Code Runner runs on your own machine — the client starts it, so there is no endpoint to ping. 1 601 installs a week from npm. Last commit 22 Sep 2025.

Code Runner MCP Server which can run code in various programming languages.

Installs per day peak 567 · avg 91 · -26% w/w

a month agotoday

1 601

Installs / week

npm · mcp-server-code-runner

246

Stars

8 open issues

22 Sep 2025

Last commit

0 releases in 90 days

MIT

License

TypeScript

What the code does

We read the source, 19 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable src/server.ts:60

  const filePath = path.join(tmpDir, fileName);

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add code-runner -- npx -y mcp-server-code-runner

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

[mcp_servers.code-runner]
command = "npx"
args = ["-y", "mcp-server-code-runner"]

.cursor/mcp.json

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

.vscode/mcp.json

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

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Code Runner — questions

Answers built from our own checks of this server.

Why is there no uptime for Code Runner?

Code Runner runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package mcp-server-code-runner was installed 1 601 times last week.

How do I connect Code Runner?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls mcp-server-code-runner straight from npm; nothing to host, nothing to sign up for.

How many people use Code Runner?

The npm package mcp-server-code-runner was installed 1 601 times in the last week. Week over week that is -26%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Code Runner open source?

Yes — it is published under the MIT licence, written in TypeScript, 246 stars on GitHub and 8 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.