| name | autocad-mcp-premium |
| description | Use when working with AutoCAD MCP Pro tools and the user asks for technical drawings, P&ID, mechanical engineering output, ISO-conformant drawings, premium-quality CAD, or mentions trim/extend/fillet/chamfer, layer discipline, or "premium drawing". Apply the plan→draw→critique workflow strictly. |
AutoCAD MCP Premium Drafting Skill
Premium drafting discipline for the AutoCAD MCP Pro server. The goal: ISO-conformant
output that a real draftsman would sign. The path: a strict workflow + the corner
ops + meta-tool layer that ship with the server.
When this skill applies
- The user asks for a technical drawing, P&ID, mechanical part, or
any drawing intended for production / fabrication / approval.
- The user mentions TRIM, EXTEND, FILLET, CHAMFER, OSNAP, ISO 128/129/
13567, layer discipline, or premium drawing.
- You are about to call
entity_create_* for a deliverable drawing — stop and
apply the workflow below first.
The 9-step Premium Workflow (non-negotiable)
1. drawing_plan(intent, sheet_size, scale) # commit intent BEFORE drawing
2. drawing_apply_iso_layers("mech" | "pid" | "iso13567")
3. construction_xline(...) # scaffolding (optional)
4. entity_create_line / circle / arc / ... # geometry on engineering layers
5. entity_trim / entity_fillet / entity_chamfer # close corners explicitly
6. handles = entity_select_smart({type, layer, ...}) # don't memorise handles
7. dimension_auto(handles, style="chain"|"baseline"|"ordinate")
8. issues = drawing_critique(focus=None) # must be []
9. construction_clear()
10. drawing_finalize(save_path=..., screenshot_path=...)
If any of these is skipped, the drawing is not premium — it's a sketch.
The 8 Non-Negotiable Rules (mirror of CLAUDE.md)
- Plan before draw —
drawing_plan first; PlanSpec is the contract.
- No coordinate guessing —
point_from_snap(handle, snap, ref_x, ref_y).
- Layer discipline — engineering layers only; CONSTRUCTION for scaffold.
- Lineweights are ISO 128 — bootstrap via
drawing_apply_iso_layers.
- Corners are explicit —
entity_trim / entity_fillet / entity_chamfer.
- Dimensions via auto —
dimension_auto, not loops of dimension_linear.
- Critique then finalize —
drawing_critique must return [].
- Meta-tools over raw — never reimplement what a meta-tool already does.
Tool Inventory (this skill assumes server has these registered)
| Group | Tools | Count |
|---|
| Drawing | drawing_* (info/new/open/save/export/finalize/...) | 11 |
| Entity Create | entity_create_line/circle/arc/polyline/text/... | 12 |
| Dimensions | dimension_linear/aligned/angular/radius/diameter | 5 |
| Entity Modify | entity_move/copy/rotate/scale/mirror/offset/delete/... | 10 |
| Corner Ops ⭐ | entity_trim entity_extend entity_fillet entity_chamfer | 4 |
| Entity Query | entity_get/list/delete_many | 3 |
| Layer Mgmt | layer_*, linetype_list/load | 14 |
| Block Ops | block_* | 7 |
| Analysis | analysis_* | 8 |
| View | view_* | 4 |
| Transactions | transaction_* | 3 |
| System | system_* | 6 |
| Engineering | gear_*, keyway_*, titleblock_*, drawing_finalize | 7 |
| Premium Meta ⭐ | drawing_plan drawing_critique point_from_snap construction_xline/clear drawing_apply_iso_layers dimension_auto entity_select_smart | 8 |
Reference Documents (read on demand)
Examples
Anti-patterns to refuse
- Calling
entity_create_* before drawing_plan for a deliverable drawing.
- Computing endpoint/midpoint/intersection coordinates by hand instead of
point_from_snap.
- Drawing on layer 0 (or any non-engineering layer).
- Leaving the CONSTRUCTION layer populated at finalize time.
- Hand-rolling trim/extend math when
entity_trim / entity_extend exists.
- Skipping
drawing_critique and going straight to drawing_finalize.
When the user requests a premium drawing, walk the 9 steps in order and
narrate each call. If a critique returns non-empty issues, fix them in place
before proceeding to finalize.
