Explore codebase, analyze code, review code, assess code quality, evaluate architecture, find callers, measure impact, search semantically, generate documentation, navigate index. Triggers on: dependencies, what calls, who calls, what uses, callers, impact, blast radius, code architecture, find function, search code, explore codebase, analyse code, review code, review documentation, document, create documentation, evaluate, assess, index structure, list symbols, list functions, list classes, how many files, how many lines, codebase stats, inventory.