Deals — the transactional spine tracking a work changing hands. action "list": deals you can see (owner/seller/buyer/intermediary), filter by state/work_id/direction — read-only. action "get": deal detail incl. linked records (RAI requests, consignment requests, shared views, sales, provenance, custody) — read-only; needs deal_id. action "create": manual deal creation (most deals auto-create from purchase requests / consignment approvals) — write; present a summary + confirm first. action "update_state": advance (proposed→negotiating→agreed→closed_won|closed_lost) or close — write; close_reason required for closed_lost; present the transition + confirm first.