FetchSandbox MCP Server: Install & Setup

Install FetchSandbox in Claude Code

Remote URL

Claude Code

claude mcp add --transport http fetchsandbox https://fetchsandbox.com/mcp/v1

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

{
  "mcpServers": {
    "fetchsandbox": {
      "url": "https://fetchsandbox.com/mcp/v1"
    }
  }
}

npm

Claude Code

claude mcp add fetchsandbox -- npx -y fetchsandbox-mcp

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

{
  "mcpServers": {
    "fetchsandbox": {
      "command": "npx",
      "args": [
        "-y",
        "fetchsandbox-mcp"
      ]
    }
  }
}

Frequently asked questions

What does the FetchSandbox MCP server do?

A deterministic verification engine for agents. Proves a fix: fails on the old code, passes on new.

Is the FetchSandbox MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does FetchSandbox run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add FetchSandbox to Claude Code?

Run: claude mcp add --transport http fetchsandbox https://fetchsandbox.com/mcp/v1

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