domain-check-skills-mcp is a free, MIT-licensed Model Context Protocol server on npm. It gives Claude, Cursor, Windsurf, Continue, Zed, ChatGPT and any MCP-compatible client four tools: check_domain (availability, premium flag, cheapest registrar and buy link), search_domains (one name across the most popular TLDs), compare_registrars (registration, renewal and 3-year totals per registrar) and get_domain_age (registration year and expiry via RDAP).
Install with one command in Claude Code: claude mcp add domain-check -- npx -y domain-check-skills-mcp. No API key, no account.