sandbox-mcp
Enables secure execution of bash, Python, and Node.js code in isolated Firecracker microVMs with configurable timeouts and no network access.
README
sandbox-mcp
MCP service that exposes sandboxed code execution tools. Delegates execution to a
sandbox-runner VM running Firecracker microVMs on Proxmox (nested KVM).
Tools
| Tool | Description |
|---|---|
shell_run |
Run bash script in isolated microVM |
python_run |
Run Python 3 code in isolated microVM |
node_run |
Run Node.js code in isolated microVM |
All tools: no network access, 256MB RAM, 0.5 CPU, configurable timeout (default 15s).
Environment Variables
| Variable | Required | Description |
|---|---|---|
SANDBOX_MCP_INTERNAL_TOKEN |
Yes | Auth token for MCP clients |
SANDBOX_RUNNER_URL |
No | URL of sandbox-runner VM (e.g. http://sandbox-runner:8080) |
SANDBOX_RUNNER_TOKEN |
No | Bearer token for sandbox-runner auth |
PORT |
No | HTTP port (default 3001) |
SANDBOX_TIMEOUT_MS |
No | Default execution timeout ms (default 15000) |
Sandbox Runner Contract
The service expects a sandbox-runner HTTP API (deployed separately on Proxmox):
POST /run
Body: { lang: "bash" | "python" | "node", code: string, timeoutMs: number }
Response: { stdout: string, stderr: string, exitCode: number, durationMs: number }
GET /health
Response: { status: "ok", poolSize: number, available: number }
Without Proxmox (pre-deployment)
If SANDBOX_RUNNER_URL is not set, the service starts normally but all tool calls
return a 503 not configured message. The feature flag sandbox_exec should remain
disabled until the runner is deployed.
Endpoints
GET /health— health check, includesrunnerConfiguredbooleanPOST /mcp— MCP JSON-RPC (StreamableHTTP)GET /mcp— MCP SSE transport
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