DNS Resolver

This tool checks whether a given domain is available for registration and fetches its DNS records, including at minimum A, MX, and TXT records where present. It accepts a single required input named domain, a string containing the fully qualified domain name to query, such as example.com. The backing implementation will perform the DNS and availability lookups and then map the results into the structured output. The assistant using this tool must ensure that the final response strictly validates against the system-provided structured output schema for this tool, with correct types and no extra keys, and that no optional fields are included unless their values are known from the provided inputs or lookup results.