LocalFree

v8 MCP server

r33drichards/mcp-js

JavaScript sandbox that uses V8 isolation to run AI-generated code locally, with heap snapshotting for persistent sessions.

64 GitHub stars13 forks
Source code

Install v8 in Claude Code

Claude Code
claude mcp add v8 -- docker run -i --rm docker.io/wholelottahoopla/mcp-js:0.22.0
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "v8": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "docker.io/wholelottahoopla/mcp-js:0.22.0"
      ]
    }
  }
}

Frequently asked questions

What does the v8 MCP server do?

JavaScript sandbox that uses V8 isolation to run AI-generated code locally, with heap snapshotting for persistent sessions.

Is the v8 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 v8 run locally or remotely?

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

How do I add v8 to Claude Code?

Run: claude mcp add v8 -- docker run -i --rm docker.io/wholelottahoopla/mcp-js:0.22.0

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