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MCP spec 2026-07-28 shipped July 28 with a stateless core, header routing, and Tasks for long lookups. Here is how domain check, WHOIS, and portfolio tools should expose tools—not chatbot guesses.

Production domain agents combine LLM generation, RDAP/WHOIS cascades, and scoring layers—not chatbots that hallucinate availability. Here is the six-layer stack with real API patterns.

We benchmarked eight bulk checkers against verified limits—5,000 on Namecheap Beast Mode, 100 on Porkbun, 50 per Namecheap API call—and three lookup architectures. Here is how to pick without losing your search list to a registrar.