sequence-diagram

Turn a compact text spec into a consistent UML sequence diagram: participants across the top, vertical lifelines, time flowing down, bound message arrows.

Before you start

• Read references/shared/bridge.md (bundled with this skill), references/shared/style.md, references/shared/diagramming.md, references/shared/uml-notation.md (UML 2.x extras: fragments, guards, activation bars / composite states).
• Read ./reference.md — the spec DSL and exact layout math.

Target document

Convention: ~/canvas/sequence/<flow>.tldraw. Locate via api.getDocs({ name }); if not open, create/open it with sh scripts/new-canvas <absolute-path> (see references/shared/conventions.md; template seed via canvas-setup if missing).