The 1.x line is frozen - features and bugfixes now happen on https://github.com/yarnpkg/berry

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RAW Config

Claude Desktop Configuration

Add to ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "yarn": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-yarn"
      ]
    }
  }
}