Cairn MCP Server: Install & Setup

Install Cairn in Claude Code

Claude Code

claude mcp add --transport http workers-cairn https://cairn.notdown-app.workers.dev/mcp

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

{
  "mcpServers": {
    "workers-cairn": {
      "url": "https://cairn.notdown-app.workers.dev/mcp"
    }
  }
}

Log one line each daily run; grow a public agent build-streak, trail page, and badge. No signup.

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

Remote. Hosted by the provider. You connect with a URL, nothing to install.

Run: claude mcp add --transport http workers-cairn https://cairn.notdown-app.workers.dev/mcp

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