Document and explain the codebase as-is using parallel sub-agents. Use when the user asks to research, explore, map, document, or understand the codebase — including questions like 'how does X work', 'where is Y implemented', 'show me the architecture', 'what does this module do', or any request for codebase-level understanding. Also use when the user says /research_codebase. Even if the user's question seems simple, if it requires reading multiple files or understanding cross-component interactions, use this skill.
