13 added, 9 removed. Audit A to A.
---
name: gen
- description: Generate PartCAD geometry from a description, automatically deciding whether the request is a single part or a multi-part assembly and following the matching flow. Use for /pc:gen or when the user asks to generate, create, or model something in PartCAD without saying whether it is a part or an assembly.
+ description: Generate PartCAD geometry from a description, automatically deciding whether the request is a single part, a multi-part assembly, or a 2D sketch and following the matching flow. Use for /pc:gen or when the user asks to generate, create, or model something in PartCAD without saying whether it is a part, an assembly, or a sketch.
---
# pc:gen
Entry point for PartCAD generation when the user has not said whether they want a
- single **part** or an **assembly**. The text after the command (`$ARGUMENTS`) is
- the description of what to build. Decide which it is, tell the user your choice,
- then follow that flow — passing the same description through.
+ single **part**, an **assembly**, or a 2D **sketch**. The text after the command
+ (`$ARGUMENTS`) is the description of what to build. Decide which it is, tell the
+ user your choice, then follow that flow — passing the same description through.
- ## Decide: part or assembly?
+ ## Decide: part, assembly, or sketch?
- - **Part** → `/pc:gen-part`. One continuous piece of geometry — a bracket, a
+ - **Part** → `/pc:gen-part`. One continuous piece of 3D geometry — a bracket, a
gear, a housing, a knob. Modeled as a single script, even when intricate.
- - **Assembly** → `/pc:gen-assembly`. Several distinct components that fit or move
- relative to each other — a gearbox, a robot arm, a body with a lid, anything
- joined by fasteners.
+ - **Assembly** → `/pc:gen-assembly`. Several distinct 3D components that fit or
+ move relative to each other — a gearbox, a robot arm, a body with a lid,
+ anything joined by fasteners.
+ - **Sketch** → `/pc:gen-sketch`. A 2D profile, outline, or blueprint — a gasket
+ shape, a plate outline, a cross-section to be extruded later.
Heuristics:
+ - "2D", "profile", "outline", "sketch", "cross-section", "blueprint" → **sketch**.
- One noun, "a"/"single", one manufacturing process, one printed/machined piece
→ **part**.
- Plurals, "with", "attached to", "... and a ...", moving joints, fasteners, or
named sub-components → **assembly**.
If it is genuinely ambiguous, ask one short question. Otherwise proceed with your
best judgment and state which you picked — the user can redirect.
## Then
+ - Sketch → follow **`/pc:gen-sketch`**.
- Part → follow **`/pc:gen-part`**.
- Assembly → follow **`/pc:gen-assembly`** (which itself uses `/pc:gen-part` for
any missing components).