It's a pseudo-plugin system for chatbots, specifically the popular ones (Claude, chatgpt).

It is presented as a scalable way to provide tools to LLMs but that's only if you assume every use of LLMs is via the popular chatbot interfaces, which isn't the case.

Basically it's Anthropic's idea for extending their chatbot's toolset into desktop apps such as Google drive and others who may wish to make their software capabilities integrated into chatbots as tools.

Of course as with everything in tech, especially AI related, it has been cargo-culted to be the second coming of the messiah while all nuances about its suitability/applicability is ignored.