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On your first datafrey run, the CLI asks which AI client you want to connect — pick MCP (Custom). To reprint the config later: 
datafrey client mcp
Paste the printed JSON into your client’s MCP settings.

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The config

datafrey client mcp prints this block and copies it to your clipboard: 
{
  "mcpServers": {
    "datafrey": {
      "url": "https://mcp.datafrey.ai/mcp"
    }
  }
}
DataFrey exposes the MCP server at https://mcp.datafrey.ai/mcp. Any MCP-compatible client can call its plan and run tools.

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Authentication

On first MCP tool call, the server returns an auth URL. Your client opens it (or shows it); complete OAuth in the browser. Tokens refresh automatically.