Multi-agent search across Obsidian vault for comprehensive knowledge retrieval. Use when (1) searching for notes ("find notes about X", "search for Y"), (2) answering knowledge questions ("what do I know about X", "summarize my understanding of Y"), (3) ANY task requiring comprehensive understanding of vault contents - research planning, connecting ideas, finding related work, understanding what exists before creating new content. Uses Obsidian CLI for fast retrieval and subagents for synthesis.