I sent initialize + tools/list to 50 random MCP servers from the official registry. 54% won't talk to an agent without a key.
TL;DR: If you're building an agent that discovers tools on its own, most of the official MCP registry is closed to it before the first handshake. In a random sample of 50 remote servers (Nov 8, 2026): 27 of 50 (54%) returned 401 on initialize , so an agent without a key can't even see what the serv…
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- 2026-11-12 13:33 · DEV Community — AI
I sent initialize + tools/list to 50 random MCP servers from the official registry. 54% won't talk to an agent without a key.