@slicervm/mcp

A Model Context Protocol server that gives an AI agent its own fleet of disposable Linux microVMs on hardware you control.

When an agent executes code, it runs on something. Run it on your laptop and a bad rm -rf, a leaked key, or a runaway process is your problem. This server puts that execution inside a real VM boundary instead: the agent spawns an isolated microVM, runs commands in it, cold-forks a prepared VM into many branches to explore changes in parallel, and destroys them when done — all on your own box, sub-second, with the daemon's egress policy in force.

Tools

slicer_fork is the differentiated one: set an environment up once (install deps, clone a repo, warm a cache), then fork it so an agent can try ten approaches in parallel from an identical starting point. Only on-disk state carries over — write anything you want inherited to a real path, not /tmp.

Related MCP server: Ubuntu MCP Server

Requirements

• A running Slicer daemon (your laptop, homelab, or a server) reachable over HTTP or a Unix socket.

• Node.js 18+.

Configure

Set three environment variables:

• SLICER_URL — daemon API URL or socket path (required)

• SLICER_TOKEN — bearer token, if the daemon requires auth

• SLICER_HOSTGROUP — host group to launch into (auto-selected when the daemon has one group, or the sbox group; otherwise set it explicitly)

Claude Code

claude mcp add slicer -- npx -y @slicervm/mcp \
  -e SLICER_URL=http://127.0.0.1:8080 \
  -e SLICER_TOKEN=... \
  -e SLICER_HOSTGROUP=sbox

Claude Desktop / Cursor (mcp.json)

{
  "mcpServers": {
    "slicer": {
      "command": "npx",
      "args": ["-y", "@slicervm/mcp"],
      "env": {
        "SLICER_URL": "http://127.0.0.1:8080",
        "SLICER_TOKEN": "...",
        "SLICER_HOSTGROUP": "sbox"
      }
    }
  }
}

Try it

Once wired in, ask your agent:

Spawn a Linux VM, install cowsay, snapshot it, then fork it three ways and have each fork say something different. Clean up after yourself.

Development

This package depends on cold-fork support in @slicervm/sdk >= 0.2.0, which is pending publish. For local development, link the SDK build:

(cd ../sdk-ts && npm run build && npm link)
npm link @slicervm/sdk

Then build this server:

npm install
npm run build
node dist/index.js   # with SLICER_URL etc. set