The 1.x line is frozen - features and bugfixes now happen on https://github.com/yarnpkg/berry
Add to ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"yarn": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/server-yarn"
]
}
}
}