Superserve Sandbox MCP Server

@superserve/mcp

Model Context Protocol server for Superserve sandboxes. Create, run commands in, and manage isolated Firecracker microVMs from any MCP client — Claude, Cursor, VS Code, Windsurf, Codex.

Runs locally over stdio via npx. Authenticates with your Superserve API key. Targets a sandbox per call by id.

Install

Add to your MCP client and set SUPERSERVE_API_KEY in its env (clients do not inherit it from your shell). Create a key at console.superserve.ai.

Claude Code:

claude mcp add superserve \
  --env SUPERSERVE_API_KEY=ss_live_xxxxxxxxxxxxxxxx \
  -- npx -y @superserve/mcp

Claude Desktop / Cursor / Windsurf (claude_desktop_config.json, .cursor/mcp.json, mcp_config.json):

{
  "mcpServers": {
    "superserve": {
      "command": "npx",
      "args": ["-y", "@superserve/mcp"],
      "env": { "SUPERSERVE_API_KEY": "ss_live_xxxxxxxxxxxxxxxx" }
    }
  }
}

VS Code (.vscode/mcp.json, prompts for the key):

{
  "inputs": [
    {
      "id": "superserve-key",
      "type": "promptString",
      "description": "Superserve API key",
      "password": true
    }
  ],
  "servers": {
    "superserve": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@superserve/mcp"],
      "env": { "SUPERSERVE_API_KEY": "${input:superserve-key}" }
    }
  }
}

Codex (~/.codex/config.toml) — env_vars forwards the key from your environment instead of storing it in the file:

[mcp_servers.superserve]
command = "npx"
args = ["-y", "@superserve/mcp"]
env_vars = ["SUPERSERVE_API_KEY"]

Hosted (remote)

A hosted instance runs at https://mcp.superserve.ai (Streamable HTTP) — no local install. Send your Superserve API key as a bearer token; the server is stateless and account-scoped (the key already maps to your team).

Bearer auth works in Claude Code, Cursor, VS Code, and the Anthropic Messages API connector. Claude.ai, Claude Desktop's Custom Connector UI, and ChatGPT developer mode expect OAuth (no static-bearer field), which the hosted endpoint does not support yet.

Claude Code:

claude mcp add --transport http superserve https://mcp.superserve.ai \
  --header "Authorization: Bearer ss_live_xxxxxxxxxxxxxxxx"

Cursor / VS Code (.cursor/mcp.json, .vscode/mcp.json):

{
  "servers": {
    "superserve": {
      "type": "http",
      "url": "https://mcp.superserve.ai",
      "headers": { "Authorization": "Bearer ss_live_xxxxxxxxxxxxxxxx" }
    }
  }
}

Running the hosted server

The same package ships the hosted server. Run it standalone (self-host / staging):

PORT=8080 SUPERSERVE_BASE_URL=https://api.superserve.ai \
  npx -y -p @superserve/mcp superserve-mcp-http

Or mount the Web-standard handler in any fetch runtime (e.g. a Next.js route handler):

import { handleMcpRequest } from "@superserve/mcp/http"

export const POST = (req: Request) => handleMcpRequest(req)

It serves the MCP endpoint at / (POST) and a GET /health liveness probe. Config: PORT (default 8080), SUPERSERVE_BASE_URL (optional). The API key is read per request from the bearer header and never logged.

Tools

Tool	Description
sandbox_create	Create a sandbox; returns its id. Accepts secrets bindings and egress rules.
sandbox_update	Change a sandbox's metadata or egress (allow_out/deny_out) rules after creation.
sandbox_list	List sandboxes (active and paused), filterable by metadata.
sandbox_info	Get a sandbox's status, resources, metadata, network rules, and secret bindings.
sandbox_exec	Run a shell command; returns stdout, stderr, exit code. Auto-resumes a paused sandbox.
sandbox_files_read	Read a file (UTF-8 text or base64). Rejects files over 1 MiB.
sandbox_files_write	Create or overwrite a file (inline content capped at 8 MiB).
sandbox_files_list	List a directory.
sandbox_files_download_dir	Download a directory as a base64 ZIP (symlinks skipped). Capped at 10 MiB.
sandbox_pause	Pause a sandbox (state preserved).
sandbox_resume	Resume a paused sandbox (usually unnecessary — exec auto-resumes).
sandbox_kill	Delete a sandbox.
sandbox_preview_url	Build the public URL for a listening port (unauthenticated).
sandbox_network_log	Audit a sandbox's outbound connections.
sandbox_template_list	List the templates (prebuilt base images) your team can create sandboxes from.
sandbox_template_create	Build a custom template (vCPU/memory/disk shape, preinstalled software). Async.
secret_list	List bindable team secrets (metadata only — never values).
sandbox_attach_secret	Bind a stored secret to a sandbox under an env var.
sandbox_detach_secret	Remove a secret binding from a sandbox.

All tools take a sandbox_id except sandbox_create, sandbox_list, sandbox_template_list, sandbox_template_create, and secret_list. Secret creation is intentionally not exposed (the raw value belongs on the SDK/console, not an agent transcript); the server only binds existing secrets.

Configuration

Variable	Required	Default
SUPERSERVE_API_KEY	Yes	—
SUPERSERVE_BASE_URL	No	https://api.superserve.ai

Development

bun install
bunx turbo run build     --filter=@superserve/mcp
bunx turbo run typecheck --filter=@superserve/mcp
bunx turbo run test      --filter=@superserve/mcp        # unit + in-memory integration (no credentials)
SUPERSERVE_API_KEY=ss_live_... bunx turbo run e2e --filter=@superserve/mcp   # live round-trip

The server is a thin adapter over @superserve/sdk; the per-sandbox data-plane access token is managed by the SDK and never exposed to the model.

License

Apache-2.0