Other MCP Server

Code Runner

Name: Code Runner
Author: formulahendry

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

Scan flagged something by formulahendry239MITTypeScriptIntermediatestdio

Install

Claude Code

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

Cursor

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

VS Code

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

Windsurf

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

Claude Desktop

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

Safety Report

67% Scan flagged something

Scanned 5 months ago

4 passed 1 warnings 1 failed

Security

Authentication

details

No authentication mechanism detected in source code

Fail

CORS Policy

details

stdio transport — CORS not applicable

N/A

Rate Limiting

details

No rate limiting mechanism detected

Info

Known CVEs

details

No known CVEs in dependencies

Pass

Code Quality

Dependency Audit

details

No known vulnerable dependencies detected

Pass

Dangerous Patterns

details

No dangerous code patterns detected

Pass

License

details

License: MIT

Pass

Community

Maintenance Status

details

Last commit 6 months ago

Warning

Learn about our security methodology →

Compatibility

Claude CodeFull support

Tested

CursorFull support

Tested

VS CodeFull support via Copilot

Tested

WindsurfFull support

Tested

Claude DesktopFull support

Tested

Frequently Asked Questions

What is Code Runner?

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

Is Code Runner safe to use?

We cannot tell you that, and nobody scanning at this scale can. What we did in March 2026 was shallow-clone Code Runner and run five keyword searches over its source: auth identifiers, CORS configuration, rate-limit identifiers, the dependency manifest against a hardcoded list of 18 known-vulnerable packages, and unguarded eval/exec calls. At least one matched — the specific finding is in the scan report on this page. A text search cannot follow a variable, judge intent, or tell you what a server does once it is running, so "nothing matched" is not "safe". What the scan does and does not cover is written out at /mcp/security.

What are alternatives to Code Runner?

Similar MCP servers include FastMCP, Oh My Posh Validator, Claude Flow. Each serves a similar purpose but may differ in features, language, and compatibility.