ScratchRun MCP Server: Install & Setup

Install ScratchRun in Claude Code

Claude Code

claude mcp add scratchrun -e SCRATCHRUN_API_KEY=... -- npx -y @scratchrun/mcp-server

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "scratchrun": {
      "command": "npx",
      "args": [
        "-y",
        "@scratchrun/mcp-server"
      ],
      "env": {
        "SCRATCHRUN_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the ScratchRun MCP server do?

Ephemeral MicroVM-isolated code execution for AI agents. Fresh VM per call, hard-purged after.

Is the ScratchRun MCP server free?

Probably not entirely. The listing mentions pay-per-call, credits or a subscription. Check the provider for current pricing.

Does ScratchRun run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add ScratchRun to Claude Code?

Run: claude mcp add scratchrun -e SCRATCHRUN_API_KEY=... -- npx -y @scratchrun/mcp-server

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