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Use when writing or debugging OAS geometry — points, polygons, line segments, arcs, circles, spirals, fillets, units, or coordinate conventions. Load before any geometry-heavy edit.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Use when authoring or editing OAS-Core JSON — rooms, walls, openings (doors/windows), curtain walls, roofs, floor slabs, furniture, railings, or annotations in a 2D floor plan.
Use when adding or editing OAS extension blocks — machinery, materials, site, MEP, or Autodesk metadata — that augment a Core or Layout document.
Use when producing or editing fully resolved OAS-Layout JSON — multi-level plans with levels, rooms, walls, openings, slabs, roofs, furniture, railings, and inter-level connections.
Use when capturing OAS design intent — room requirements, area targets, adjacency rules, circulation rules, or global constraints — before any geometry has been resolved.
Use when mapping OAS plans to a visual output — SVG, Canvas, or WebGL — including scale, axis orientation, and z-order layering.
| name | oas-geometry |
| description | Use when writing or debugging OAS geometry — points, polygons, line segments, arcs, circles, spirals, fillets, units, or coordinate conventions. Load before any geometry-heavy edit. |
Use this skill whenever the task touches coordinates, curves, polygon validity, units, or angular conventions. This is the largest section of the spec, so load it early when you suspect a geometry bug (integer-mm violations, polygon not closing, arc winding wrong). If the work is about which entity owns the geometry (room vs. wall etc.), prefer oas-core or oas-layout.
Point — { x, y } in integer mm (optionally z for railings on stairs)Polygon — ordered points array plus explicit "closed": true; closed: false is allowed for open paths (e.g. railings)LineSegment — straight edge from start to endArc — circular arc with center, radius_mm, start_angle_deg, end_angle_degCircle — full circle (center, radius_mm)Spiral / Fillet — specialty curves used for stairs and cornersx, y, z, radius, length is integer millimeters. The single exception is area_m2, which is a derived decimal value in square meters."closed": true explicitly. A polygon without this flag is not closed by convention — don't rely on the last point matching the first.start_angle_deg to end_angle_deg. If you want a clockwise visual arc, swap start/end — do not negate angles.units.length is "mm" and units.angle is "deg" for the whole document; do not introduce per-entity unit overrides.See docs/geometry.md for the complete reference, including arc parameterization, spiral construction, and fillet rules.
oas-core and oas-layout — consumers of these geometric primitivesoas-render — for how these primitives map onto screen coordinates (Y typically inverts)