| name | cad-operations |
| description | Unified local CAD operations skill for creating, editing, validating, and exporting CAD deliverables. Use when the user asks for CAD/DWG/DXF/PDF/SVG/PNG drafting, AutoCAD/Core Console, FreeCAD/FreeCAD MCP, SolidWorks/SolidWorks MCP/COM/VBA/C# automation, SLDPRT/SLDASM/STEP/STL files, electrical main single-line diagrams/电气主接线图/一次接线图/SLD, pavement structure drawings/路面结构图, or any local CAD workflow that should use installed CAD tools, scripts, and MCP assets. |
CAD Operations
Purpose
Use this as a single entry point for CAD work. Route each task to the narrowest reproducible workflow, prefer generated/interchange files before manual edits, and verify outputs with live files or rendered previews before delivery.
First decisions
-
Identify the CAD family
- Electrical main wiring / SLD / 变电站主接线 / 一次接线图 → read
references/electrical-main-sld.md, use scripts/make_main_sld.py.
- Pavement / road layer cross-section / 路面结构图 → read
references/pavement-structure-cad.md, use scripts/generate_pavement_cad_ezdxf.py.
- SolidWorks parts, assemblies, drawings, STEP/STL/SLDPRT/SLDASM, feature creation, mates, rebuilds → read
references/solidworks-mcp.md.
- Generic 2D DWG/DXF editing, plotting, conversion, or AutoCAD/FreeCAD use → read
references/autocad-freecad.md.
- Unsure or environment-sensitive → read
references/local-cad-environment.md.
-
Choose the output source of truth
- Prefer DXF for editable 2D CAD interchange.
- Prefer SLDPRT/SLDASM/SLDDRW for native SolidWorks work, then export STEP/STL/DXF/PDF as requested.
- Use PDF/SVG/PNG previews for review; do not rely on DXF syntax alone for layout correctness.
- DWG is proprietary: generate/modify DXF first, then convert or save as DWG through AutoCAD/ODA/LibreCAD/SolidWorks when explicitly required.
-
Keep work reproducible
- Create specs/scripts in the active workspace, not in the skill directory.
- Keep originals separate from generated files.
- Prefer editing a JSON spec or script and regenerating rather than hand-patching many coordinates.
- For destructive edits to native CAD files, save a copy/backup first unless the user explicitly requests in-place modification.
Quick commands
Electrical SLD:
python scripts/make_main_sld.py examples/electrical_sld_spec.json --outdir output/sld --stem main_sld
Pavement structure DXF:
python scripts/generate_pavement_cad_ezdxf.py examples/pavement_structure_spec.json --out output/pavement
Open a generated CAD file in AutoCAD when configured:
& $env:AUTOCAD_EXE "output\pavement\pavement_structure.dxf"
Start a local SolidWorks MCP server for diagnostics when installed:
Set-Location -LiteralPath $env:SOLIDWORKS_MCP_HOME
& ".\.venv\Scripts\python.exe" -m solidworks_mcp.server
Verification rules
Before final response on any CAD deliverable:
- Confirm every requested output file exists and is non-empty.
- For DXF, validate with
ezdxf.readfile when possible.
- For PDF/SVG/PNG, render or inspect the latest preview when visual layout matters.
- For SolidWorks, require live rebuild/status evidence plus saved native/export files; mock-mode MCP results are not engineering truth.
- Report exact paths and any assumptions about units, dimensions, standards, topology, or missing source data.
Bundled resources
scripts/make_main_sld.py — parameterized electrical main single-line diagram generator; outputs DXF/PDF/SVG.scripts/generate_pavement_cad_ezdxf.py — lightweight pavement structure DXF generator using ezdxf.scripts/generate_pavement_cad.py — dependency-light fallback pavement CAD generator.scripts/audit_sld.py — generic DXF audit helper for generated SLD drawings.references/local-cad-environment.md — environment variables, tool discovery, and MCP status checks.references/electrical-main-sld.md — SLD workflow, symbols, topology, checks.references/pavement-structure-cad.md — pavement JSON schema and workflow.references/solidworks-mcp.md — SolidWorks MCP, COM/VBA fallback, verification.references/autocad-freecad.md — AutoCAD/Core Console and FreeCAD notes.
