LLMs were trained on the how we use text interfaces. You don't need to adopt command line for an LLM to use. You don't really need RAG - just connect the LLM to the shell tools we are using for search. And ultimately it would be much more useful if the language servers had good cli commands and LLMs were using them instead of going via MCP or some other internal path - ripgrep is already showing how much more usable it is this way.