autocad-mcp-pro/.claude/skills/autocad-mcp-premium/SKILL.md

name, description

name	description
autocad-mcp-premium	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)

1. Plan before draw — drawing_plan first; PlanSpec is the contract.
2. No coordinate guessing — point_from_snap(handle, snap, ref_x, ref_y).
3. Layer discipline — engineering layers only; CONSTRUCTION for scaffold.
4. Lineweights are ISO 128 — bootstrap via drawing_apply_iso_layers.
5. Corners are explicit — entity_trim / entity_fillet / entity_chamfer.
6. Dimensions via auto — dimension_auto, not loops of dimension_linear.
7. Critique then finalize — drawing_critique must return [].
8. 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)

• references/corner-ops.md — trim/extend/fillet/chamfer semantics, decision tree (when to use which), corner-case table.
• references/meta-planning.md — drawing_plan, drawing_critique, point_from_snap deep dive + PlanSpec / Issue schema.
• references/iso-standards.md — ISO 128 line widths, ISO 13567 layer naming, ISO 129 dimension rules — printable tables.
• references/premium-workflow.md — full worked examples of the 9-step workflow with code blocks.

Examples

• examples/premium-shaft.md — Shaft with keyway (Anka-Makine reference part).
• examples/pid-simple-loop.md — P&ID flow control loop with ISA-5.1 tags.

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.