This is semantic search for codebases, basically letting you ask "where is authentication configured?" instead of grepping for exact strings. It's built on mgrep and makes sense once you hit 30+ files or nested directories where you're hunting for concepts rather than known function names. You run a watcher to index the repo, then query in natural language. It has options for AI synthesis of results and respects gitignore by default. The honest take is this bridges the gap between "I know what this feature does" and "where the hell is it implemented," which is most of your time in unfamiliar code. Works via bunx, so no installation needed.
npx skills add https://github.com/intellectronica/agent-skills --skill mgrep-code-search