A few challenges:
- Discovery - where does it find the relevant servers?
- Relevance - of the hundreds of servers that might be considered relevant, how to rank and choose?
- Security - how does it determine if a discovered server is safe?
Discovery - there are a number of registries, and soon to be many more, including an officially supported one which will not be canonical, but perhaps a little safer than many of the catchall registries that scrape every MCP server on the Internet in a quest for completeness. Do you choose a subset of these registries, or attempt to hit them all?
Relevance - If a search of all the supported registries turns up a bunch of equivalent possibilities, how does it determine which one to call? Seems like registries will need to have some sort of usage stats or rating system, but presumably every registry will implement this in a different way, making it hard to determine which one to choose for a given query.
Security - If the idea is to search through every MCP server in the universe for the perfect tool for the query, how do you avoid stepping in the bear traps laid by unscrupulous entities?