MCP Sandbox

@danstarns

Basic information

About MCP Sandbox

Turn any JavaScript module into a sandboxed MCP (Model Context Protocol) server with automatic reflection and type inference.

#mcp #sandbox #javascript #automation #ai-tools

MCP Sandbox config

No standard config provided

This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.

Repository

MCP Sandbox tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is MCP Sandbox?

MCP Sandbox automatically converts JavaScript modules into MCP (Model Context Protocol) compatible servers, making any JavaScript function accessible to AI systems. It uses VM sandboxing for security, automatic type inference, and generates proper MCP configurations. It is for developers who want to expose JavaScript functions as tools for AI models without writing MCP server code manually.

How to use MCP Sandbox?

Install globally with npm install -g @mcp-sandbox/cli and run mcp-sandbox start <module> to start an MCP server for any JavaScript module. The server runs at http://localhost:3000 by default, and tools are automatically discovered from exported functions in the module.

Key features of MCP Sandbox

Automatic reflection of JavaScript modules and function signatures
Secure sandboxing with VM isolation and configurable timeouts
Smart type inference from parameter defaults and naming patterns
JSDoc integration for extracting documentation from comments
Full JSON-RPC 2.0 and SSE protocol support
Legacy REST API endpoints for easy testing

Use cases of MCP Sandbox

Expose math or string utility functions as AI-callable tools
Turn any Node.js module into a server for MCP-compatible agents
Provide a secure sandbox for running untrusted JavaScript functions
Rapidly prototype MCP tools without writing boilerplate server code

Frequently asked questions

What is MCP Sandbox and what problem does it solve?

MCP Sandbox automatically converts JavaScript modules into MCP compatible servers, eliminating the need to manually write MCP server code for exposing functions to AI systems.

What are the runtime requirements and how do I install it?

Requires Node.js and npm. Install globally with `npm install -g @mcp-sandbox/cli` or add packages `@mcp-sandbox/core` and `@mcp-sandbox/cli` to a project.

What security measures does MCP Sandbox provide?

It provides VM isolation, configurable execution timeouts, memory limits (default 64MB), controlled require access in the sandbox, and input validation on parameters.

What transports and protocols are supported?

Full MCP protocol (JSON-RPC 2.0) via `POST /mcp/jsonrpc`, SSE via `GET /sse`, and legacy REST endpoints for testing including `GET /tools` and `POST /execute/:toolName`.

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