It feels like there's a lot of overlap with the existing MCP "Resources" [0] concept, and that "Searchable Registry" + multi-protocol (MCP/A2A, etc) is the main difference?

Too many protocols got created (MCP, A2A, etc) and so now you've got to create a new standard that can consume them all, and Google being a search index would like to index them, please =)

[0]: https://modelcontextprotocol.io/specification/2025-11-25/ser...

As always, relevant XKCD https://xkcd.com/927/