Use to investigate, audit, or reverse-engineer an unfamiliar or organically-grown Claude Code system (a .claude tree, an agent harness, a teammate's or client's setup) before trusting, extending, or rebuilding it. Trigger on "audit this harness", "what's actually in this .claude setup", "archaeology on this repo", "what's load-bearing / dead / dangerous here", "do recon before I rebuild", or when a discovery/inventory pass over agent infrastructure is needed. Produces a ranked, evidence-linked System Dossier, not a flat inventory.