SandboxAPI

io.github.MichielDeRuiterPublished by GitHub account MichielDeRuiterv1.0.0Updated Oct 24, 2026

Execute code in 8 languages (Python, JS, TS, Go, Java, C++, C, Bash) in gVisor sandboxes.

VerifiedStreamable HTTPWeb executableCloud & Infrastructure Developer Tools

Server details

Identifier: io.github.MichielDeRuiter/sandboxapi-mcp
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Sep 16, 2026

Security note

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The registry verified the GitHub account MichielDeRuiter for this listing. That does not show the account is the product's maker.

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Overview

AI-generated overview

SandboxAPI lets an AI assistant run code in eight languages inside isolated gVisor sandboxes, either through a hosted remote endpoint or a self-hosted Docker…

What you can do: Run code in Python, JavaScript, TypeScript, Go, Java, C++, C or Bash with optional timeout and stdin
Run several snippets in one batch, each in its own isolated sandbox
List supported languages with versions and example code
When to use it: Useful when an assistant needs to actually execute or test code rather than reason about it, and you want that execution isolated from your machine and network. Good for quick script checks, language comparisons and batch experiments.
Requirements: Either the hosted remote endpoint with OAuth or a bearer API key, or a local Docker image or Go build. Self-hosting needs SANDBOXAPI_API_KEY; MCP_API_KEY, MCP_PORT and SANDBOXAPI_URL are optional. An API key is obtained from the vendor site or RapidAPI.

Before you install

Code is sent to a third-party execution service, so avoid pasting secrets or private data into snippets. An API key is required and usage may be billed by the provider. Self-hosted setups can run without MCP_API_KEY, leaving the endpoint open to anyone who can reach it.

Installation

In SourceWeft

Open SandboxAPI in the dashboard and add it to a workspace.
Connect the required credentials. They are stored privately and never shown on public pages.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.MichielDeRuiter%2Fsandboxapi-mcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.

{
  "mcpServers": {
    "sandboxapi": {
      "type": "http",
      "url": "https://mcp.sandboxapi.dev/mcp"
    }
  }
}

README

SandboxAPI MCP Server

[MCP] [Languages] [License]

Give your AI agent the ability to execute code in 8 programming languages, safely.

SandboxAPI MCP Server connects any MCP-compatible AI client (Claude, Cursor, VS Code, Windsurf, etc.) to secure code execution. Every execution runs inside a gVisor-sandboxed Docker container with no network access, strict resource limits, and ephemeral filesystems.

Quick Start

Option 1: Remote Server (No Setup)

Connect directly to the hosted endpoint. No local installation required.

Claude Desktop (claude_desktop_config.json):

json

{  "mcpServers": {    "sandboxapi": {      "url": "https://mcp.sandboxapi.dev/mcp",      "headers": {        "Authorization": "Bearer YOUR_API_KEY"      }    }  }}

{  "mcpServers": {    "sandboxapi": {      "url": "https://mcp.sandboxapi.dev/mcp",      "headers": {        "Authorization": "Bearer YOUR_API_KEY"      }    }  }}

VS Code (.vscode/mcp.json):

json

{  "servers": {    "sandboxapi": {      "url": "https://mcp.sandboxapi.dev/mcp",      "headers": {        "Authorization": "Bearer YOUR_API_KEY"      }    }  }}

{  "servers": {    "sandboxapi": {      "url": "https://mcp.sandboxapi.dev/mcp",      "headers": {        "Authorization": "Bearer YOUR_API_KEY"      }    }  }}

Cursor (~/.cursor/mcp.json):

json

{  "mcpServers": {    "sandboxapi": {      "url": "https://mcp.sandboxapi.dev/mcp",      "headers": {        "Authorization": "Bearer YOUR_API_KEY"      }    }  }}

{  "mcpServers": {    "sandboxapi": {      "url": "https://mcp.sandboxapi.dev/mcp",      "headers": {        "Authorization": "Bearer YOUR_API_KEY"      }    }  }}

Option 2: Docker

bash

docker run -d \  -p 8081:8081 \  -e SANDBOXAPI_API_KEY=your_sandboxapi_key \  -e MCP_API_KEY=your_mcp_auth_key \  sandboxapi/mcp:latest

docker run -d \  -p 8081:8081 \  -e SANDBOXAPI_API_KEY=your_sandboxapi_key \  -e MCP_API_KEY=your_mcp_auth_key \  sandboxapi/mcp:latest

Then point your client to http://localhost:8081/mcp.

Option 3: Build from Source

bash

git clone https://github.com/sandboxapi/sandboxapi-mcp.gitcd sandboxapi-mcpgo build -o sandboxapi-mcp .
export SANDBOXAPI_API_KEY=your_keyexport MCP_API_KEY=optional_auth_key./sandboxapi-mcp

git clone https://github.com/sandboxapi/sandboxapi-mcp.gitcd sandboxapi-mcpgo build -o sandboxapi-mcp .
export SANDBOXAPI_API_KEY=your_keyexport MCP_API_KEY=optional_auth_key./sandboxapi-mcp

Available Tools

`execute_code`

Execute code in a sandboxed container.

Parameter	Type	Required	Description
`language`	string	Yes	`python3`, `javascript`, `typescript`, `bash`, `java`, `cpp`, `c`, `go`
`code`	string	Yes	Source code to execute (max 1MB)
`timeout`	number	No	Timeout in seconds (default: 10, max: 300)
`stdin`	string	No	Standard input to pass to the program

`execute_batch`

Execute multiple code snippets. Each runs in its own isolated sandbox.

`list_languages`

List all supported programming languages with versions and example code. No parameters.

Supported Languages

Environment Variables

Variable	Required	Description
`SANDBOXAPI_API_KEY`	Yes	API key for the SandboxAPI backend
`MCP_API_KEY`	No	Auth key for the MCP endpoint (omit for open access)
`MCP_PORT`	No	Port to listen on (default: `8081`)
`SANDBOXAPI_URL`	No	API base URL (default: `https://api.sandboxapi.dev`)

Security

Every code execution is isolated with defense-in-depth:

gVisor (runsc) — User-space kernel intercepts all syscalls
Network isolation — Executed code cannot make outbound connections
Resource limits — CPU, memory, and disk usage are capped
Ephemeral containers — Destroyed immediately after execution
Read-only filesystem — No persistent writes between executions
Code size limits — Source code capped at 1MB
Timeout enforcement — Hard kill after configured timeout

API Key

Get your API key at sandboxapi.dev or through RapidAPI.

License

MIT

Source: README.md at commit edb9d15

Tools

This server asks for a credential such as an API key, so SourceWeft could not read its tools without one and has not indexed them.

Version history

v1.0.0LatestSep 16, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 daysRequired25 pts
Auth declaredRequired10 pts
Tools listed15 pts
Answer tools/list without a credential, or ship a package that starts in a sandbox without one.
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
License10 pts

Language	Version	Aliases
Python	3.12	`python3`, `python`, `py`
JavaScript	Node 22	`javascript`, `js`, `node`
TypeScript	5.4	`typescript`, `ts`
Go	1.22	`go`, `golang`
Java	21	`java`, `jdk`
C++	GCC 14	`cpp`, `c++`
C	GCC 14	`c`, `gcc`
Bash	5.2	`bash`, `sh`, `shell`

SandboxAPI

Overview

Installation

In SourceWeft

Use with an agent

Other MCP clients

README

SandboxAPI MCP Server

Quick Start

Option 1: Remote Server (No Setup)

Option 2: Docker

Option 3: Build from Source

Available Tools

execute_code

execute_batch

list_languages

Supported Languages

Environment Variables

Security

API Key

Links

License

Tools

Version history

Score

`execute_code`

`execute_batch`

`list_languages`