The MCP Registry: authentication, FAQ and server.json schema

What we recorded

Official docs and schema opened. mcp-publisher with a server.json; GitHub login gives io.github.* names; a domain is proved by a DNS TXT record or /.well-known/mcp-registry-auth; description maxLength 100 in the 2025-12-11 schema; version metadata is immutable. The registry is described as official and in preview, not canonical.

Claims that cite it

• The official MCP registry takes a server.json through mcp-publisher. Names under io.github.* need GitHub login; a domain name is proved by a DNS TXT record or a /.well-known/mcp-registry-auth file. The description is capped at 100 characters in the schema, and published versions are immutable, so each version can be published once. The registry is described as official and in preview. Anthropic announced on 9 Dec 2025 that MCP moved to the Agentic AI Foundation under the Linux Foundation. (strong)