SandboxAPI MCP Server

by michielderuiter Your server? Claim it

answering

SandboxAPI is answering right now. Last checked 6 min ago. Last commit 5 Apr 2026.

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

Uptime history 91 days of history · worst day 99%

91 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

389 ms

Response time

average over 24h

Stars

last commit 5 Apr 2026

Nothing serious here today

Today is the operative word: we check SandboxAPI every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add sandboxapi-mcp --transport http https://mcp.sandboxapi.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://mcp.sandboxapi.dev/mcp

~/.codex/config.toml

[mcp_servers.sandboxapi-mcp]
url = "https://mcp.sandboxapi.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "sandboxapi-mcp": {
      "url": "https://mcp.sandboxapi.dev/mcp"
    }
  }
}

.vscode/mcp.json

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

This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.sandboxapi.dev/mcp	streamable-http	needs auth	378 ms	6 min ago

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SandboxAPI — questions

Answers built from our own checks of this server.

Why is there no tool list for SandboxAPI?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is SandboxAPI working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 389 ms. The bar chart above shows every period we have measured.

How do I connect SandboxAPI?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own credentials: it refuses anonymous clients.

Does SandboxAPI need an API key?

Yes. Every time we knock, SandboxAPI answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is SandboxAPI?

It answers our handshake in 389 ms on average, which is faster than 34% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is SandboxAPI open source?

The code is open source: it is published under the MIT licence, written in Go, 2 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at mcp.sandboxapi.dev, which runs on its operator's own terms.