Big Brain MCP Server: Install & Setup

Install Big Brain in Claude Code

Claude Code

claude mcp add big-brain -e BIG_BRAIN_VAULT=... -- npx -y @jzhao234/big-brain

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

{
  "mcpServers": {
    "big-brain": {
      "command": "npx",
      "args": [
        "-y",
        "@jzhao234/big-brain"
      ],
      "env": {
        "BIG_BRAIN_VAULT": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Big Brain MCP server do?

Plain-markdown second brain for you and your AI: notes, projects, tasks, search, links.

Is the Big Brain 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 Big Brain run locally or remotely?

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

How do I add Big Brain to Claude Code?

Run: claude mcp add big-brain -e BIG_BRAIN_VAULT=... -- npx -y @jzhao234/big-brain

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