Add AutoCAD MCP premium skill and backend APIs
Introduce the autocad-mcp-premium skill with workflow docs, examples, and references (.claude/skills/autocad-mcp-premium/*). Add PlanSpec/critique plumbing and engineering helpers (engineering/plan_spec.py, engineering/critique.py) plus tests and a smoke script. Extend backend API (backends/base.py) with corner operations and premium meta-tools (trim/extend/fillet/chamfer, drawing_plan, drawing_critique, point_from_snap, construction_xline/clear, drawing_apply_iso_layers, dimension_auto, entity_select_smart) and implement COM backend corner ops (backends/com_backend.py) with placeholders for meta-tools. Update CLAUDE.md to document the premium drawing rules and standard workflow. Misc: add examples, references, and tests for premium features, and minor server/backend adjustments.
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# ISO Standards Reference
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Distilled tables for the standards this skill enforces.
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## ISO 128 — Line widths
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Allowed lineweight set (mm), with 4:2:1 ratio rule:
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| Width | Common use |
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|-------|------------|
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| 0.13 | Hatch, dim text shadow |
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| 0.18 | Hidden, center, phantom, dim text |
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| 0.25 | Default text, leader |
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| 0.35 | Auxiliary visible (where contrast needed) |
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| 0.50 | Visible solid edges (most common production weight) |
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| 0.70 | Heavy solid (large-scale parts), P&ID main process |
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| 1.00 | Border, key heavy outlines |
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| 1.40 | Title borders |
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| 2.00 | Sheet outer border |
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**Rule:** every layer's lineweight must be one of these (or 0.0 = "Default" =
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inherits from active style). Anything else fails `drawing_critique` focus
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`iso128`.
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## ISO 128 — Line types
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| Type | Linetype name | Used for |
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|------|---------------|----------|
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| Continuous thick | `Continuous` (0.50+ mm) | Visible edges |
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| Dashed thin | `HIDDEN` (0.18–0.25) | Hidden edges |
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| Chain thin | `CENTER` (0.18) | Centerlines, axes of symmetry |
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| Chain double-dashed | `PHANTOM` (0.18) | Section / cutting plane / alternate position |
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| Continuous thin | `Continuous` (0.18–0.25) | Dimensions, hatch, leaders |
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## ISO 13567 — Layer naming (4-field)
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Format: `<Agent2c>-<Element6c>-<Presentation2c>-<Status1c>`
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| Field | Length | Examples |
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|-------|--------|----------|
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| Agent | 2 chars | A=Architectural, S=Structural, M=Mechanical, P=Plumbing, E=Electrical |
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| Element | 6 chars | GEOMET=geometry, HIDDEN=hidden edges, DIMEN=dimensions, TITLE=title block |
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| Presentation | 2 chars | E=edge, T=text, H=hatch |
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| Status | 1 char | N=new, E=existing, D=demolish |
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Example layer set ships in `engineering/layers.py::ISO13567_LAYERS`.
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## ISO 129-1 — Dimensioning rules
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1. **Each dimension is given once** — never repeat.
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2. **Extension lines** project at least 8× line width past the dim line.
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3. **Decimal separator** is the comma (per ISO; we accept point too).
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4. **Text orientation**: read from below the drawing or from the right side.
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5. **Font**: ISO 3098 (`isocp.shx` ships with AutoCAD).
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6. **Dimension styles**: chain, baseline, ordinate are the three standard
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layouts — choose one per drawing and stick to it (`dim_style` in PlanSpec).
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## ISO 7200 — Title-block fields
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Mandatory:
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- Legal owner (Anka-Makine)
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- Drawing number
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- Title
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- Date
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- Sheet / total sheets
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- Approver name + signature
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- Creator name
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- Document type
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Common optional:
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- Revision
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- Scale (matches PlanSpec.scale)
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- Projection symbol (1st angle ISO E vs 3rd angle ISO A)
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This skill assumes you call `titleblock_apply_iso_a3` (or its A3 cousin) to
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populate these fields after `drawing_finalize`'s validator runs.
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## ISO 14617 / 10628 — P&ID symbology
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When `layer_set_id="pid"` is passed to `drawing_plan`, the bootstrap creates
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the P&ID layer set:
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| Layer | Linetype | Lineweight | Purpose |
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|-------|----------|------------|---------|
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| `PROCESS-PIPING-MAIN` | Continuous | 0.70 | Main process line (heavy) |
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| `PROCESS-PIPING-SECONDARY` | Continuous | 0.50 | Secondary process line |
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| `PROCESS-EQUIPMENT` | Continuous | 0.50 | Vessels / pumps / drums |
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| `PROCESS-VALVES` | Continuous | 0.35 | Valves & fittings |
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| `INSTRUMENT-SYMBOL` | Continuous | 0.35 | Instrument bubbles (FCFs) |
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| `INSTRUMENT-LINE-SIGNAL` | DASHED | 0.18 | Pneumatic / electrical signal |
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| `INSTRUMENT-TAG-TEXT` | Continuous | 0.25 | Tag labels |
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| `ELECTRICAL-LINE` | DASHDOT | 0.18 | Electrical line |
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| `UTILITY-LINE` | PHANTOM | 0.25 | Steam / water / air utility |
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| `INSULATION-HATCH` | Continuous | 0.13 | Insulation hatching |
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### ISA-5.1 tag conventions (P&ID instruments)
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`<First letter><Second letter>-<Loop number><Suffix?>`
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| First letter (measured variable) | Second letter (function) |
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|----------------------------------|--------------------------|
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| F = Flow | T = Transmitter |
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| P = Pressure | I = Indicator |
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| T = Temperature | C = Controller |
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| L = Level | V = Valve |
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| A = Analytical | S = Switch |
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Examples: `FT-101` (flow transmitter, loop 101), `PCV-203A` (pressure control
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valve, loop 203, A spare).
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