The first part of this comment is great, but can you please avoid name-calling in the sense that the HN guidelines use the term?

"When disagreeing, please reply to the argument instead of calling names. 'That is idiotic; 1 + 1 is 2, not 3' can be shortened to '1 + 1 is 2, not 3." - https://news.ycombinator.com/newsguidelines.html

Your comment would be just fine without that last bit—and better still if you had replaced it with a good explanation of how MCP is not that.

Can you elaborate a bit more on "theoretical" formal grammars and constraints that would allow the LLM to use a search engine or git commands and produce the next tokens that take the results into account?

Here are some practical, non-theoretical projects based on a boring and imperfect standard (MCP) that provide LLMs capabilities to use many tools and APIs in the right situation: https://github.com/modelcontextprotocol/servers