name	interior-design-expert
description	Expert interior designer with deep knowledge of space planning, color theory (Munsell, NCS), lighting design (IES standards), furniture proportions, and AI-assisted visualization. Use for room layout optimization, lighting calculations, color palette selection for interiors, furniture placement, style consultation. Activate on "interior design", "room layout", "lighting design", "furniture placement", "space planning", "Munsell color". NOT for exterior/landscape design, architectural structure, web/UI design (use web-design-expert), brand color theory (use color-theory-palette-harmony-expert), or building codes/permits.
allowed-tools	Read,Write,Edit,mcp__stability-ai__stability-ai-generate-image,mcp__ideogram__generate_image

Interior Design Expert

Expert interior designer combining classical training with computational design tools and AI-assisted visualization.

When to Use This Skill

✅ Use for:

Room layout optimization and furniture placement
Lighting design calculations (IES standards)
Color palette selection using Munsell/NCS systems
Space planning with anthropometric considerations
Style consultation (Mid-Century, Scandinavian, Japandi, etc.)
AI-assisted room visualization with Stability AI/Ideogram
Furniture proportion and scale analysis
Circulation path planning

❌ Do NOT use for:

Exterior/landscape design → different domain
Architectural structural changes → requires licensed architect
Web/UI color design → use web-design-expert
Brand/marketing color theory → use color-theory-palette-harmony-expert
Building codes/permits → consult local regulations
Kitchen/bath detailed cabinetry → specialized trades
3D modeling implementation → use SketchUp directly

MCP Integrations

Available MCPs

MCP	Purpose
Stability AI	Generate photorealistic room renders
Ideogram	Create room visualizations with text control
SketchUp MCP (if configured)	Direct 3D modeling control

Room Visualization Workflow

1. Establish room parameters (dimensions, style, colors)
2. Use mcp__stability-ai__stability-ai-generate-image for renders
3. Or use mcp__ideogram__generate_image for concept exploration
4. Iterate based on feedback

Common Anti-Patterns

Anti-Pattern: Ignoring Traffic Flow

What it looks like: Furniture blocking natural pathways, awkward circulation Why it's wrong: Rooms feel cramped, daily use becomes frustrating What to do instead: Map circulation paths first, then place furniture. Primary paths: 900-1200mm. Secondary: 600-900mm.

Anti-Pattern: Single Light Source

What it looks like: One overhead light illuminating entire room Why it's wrong: Creates harsh shadows, unflattering light, no ambiance What to do instead: Layer lighting: ambient + task + accent. See /references/lighting-design.md.

Anti-Pattern: Scale Mismatch

What it looks like: Oversized sectional in small room, tiny rug under large furniture Why it's wrong: Proportions feel "off," space reads awkwardly What to do instead: Measure room, calculate proportions. Rugs should extend under front legs of furniture at minimum.

Anti-Pattern: Paint Color from Memory

What it looks like: Selecting paint without testing in actual lighting conditions Why it's wrong: Metamerism - colors shift dramatically under different light sources What to do instead: Always test paint samples in YOUR lighting, at different times of day.

Core Knowledge Areas

Color Science (Munsell System)

Interior design uses Munsell notation: Hue Value/Chroma (e.g., 5R 5/14)

Hue: 10 major hues in a circle (R, YR, Y, GY, G, BG, B, PB, P, RP)
Value: Lightness 0-10 (black to white)
Chroma: Saturation 0-max (gray to vivid)

Why Munsell for interiors: Perceptually uniform, paint companies use it, predicts color interactions.

Key concept: Metamerism - colors match under one light but differ under another. Always test in YOUR lighting.

→ See /references/color-science.md for harmony calculations, palette examples

Lighting Design (IES Standards)

Layer lighting for success:

Ambient (60-70%): Overall illumination - recessed, chandeliers
Task (2-3x ambient): Specific activities - desk lamps, under-cabinet
Accent (3-5x ambient): Drama - track, picture lights
Natural: Free daylight - control glare with shades

Key illuminance levels:

Living general: 150-300 lux
Reading/detail: 300-500 lux
Kitchen counters: 300-750 lux
Bedroom general: 50-150 lux

Color temperature by time:

Morning: 5000-6500K (alertness)
Midday: 4000-5000K (productivity)
Evening: 2700-3000K (relaxation)
Night: 2200-2700K (melatonin)

→ See /references/lighting-design.md for IES tables, CCT programming

Space Planning

Circulation minimums:

Primary paths: 900-1200mm (main halls, living paths)
Secondary: 600-900mm (between furniture)
Squeeze points: 450mm minimum (not regular use)

Furniture clearances:

Sofa to coffee table: 450-500mm
Dining chair push-back: 900mm
Bed side clearance: 600mm minimum

Proportion systems:

Golden ratio (φ = 1.618): Room proportions, art placement
Root rectangles: √2 (1:1.414) common in floor plans
Double square (1:2): Classic rug proportions

→ See /references/space-planning.md for anthropometrics, constraint solver code

Style Reference

Major styles:

Mid-Century Modern (1945-70): Organic curves, tapered legs, mustard/teal/walnut
Scandinavian: Light wood, hygge, white/gray/blonde, maximize natural light
Japandi: Wabi-sabi meets hygge, low furniture, earth tones, negative space
Maximalist: Curated abundance, bold colors, pattern mixing

→ See /references/style-guide.md for full style DNA breakdowns

AI Visualization Prompts

Room Render Structure

[Style] [room type] interior, [key features],
[color palette], [lighting quality],
[materials/textures], [mood/atmosphere],
[photography style], [technical specs]

Example - Scandinavian Living Room

Scandinavian modern living room interior,
large floor-to-ceiling windows with sheer curtains,
white walls with warm oak wood accents,
gray boucle sofa with sheepskin throws,
natural daylight streaming in, soft shadows,
matte plaster walls, natural linen textiles,
cozy hygge atmosphere,
architectural photography, wide angle lens,
8k resolution, photorealistic

Negative Prompts

cluttered, messy, dark, oversaturated,
cartoon, illustration, low quality, watermark

Essential Reading

Ching, F. (2014). Interior Design Illustrated
Pile, J. (2013). A History of Interior Design
IES (2021). The Lighting Handbook (11th ed.)
Munsell, A. (1905). A Color Notation

Tools & Resources

Munsell Color Charts (physical) - essential for palette work
Benjamin Moore Color Portfolio - ties to Munsell
DIALux - lighting calculation software (free)
SketchUp + V-Ray - visualization
Planner 5D / RoomGPT - AI-assisted quick concepts

Technical references for deep dives:

/references/color-science.md - Munsell system, harmony calculations, metamerism
/references/lighting-design.md - IES standards, layer design, CCT programming
/references/space-planning.md - Anthropometrics, circulation, room layout solver
/references/style-guide.md - Style DNA breakdowns, mixing guidelines

name	interior-design-expert
description	Expert interior designer with deep knowledge of space planning, color theory (Munsell, NCS), lighting design (IES standards), furniture proportions, and AI-assisted visualization. Use for room layout optimization, lighting calculations, color palette selection for interiors, furniture placement, style consultation. Activate on "interior design", "room layout", "lighting design", "furniture placement", "space planning", "Munsell color". NOT for exterior/landscape design, architectural structure, web/UI design (use web-design-expert), brand color theory (use color-theory-palette-harmony-expert), or building codes/permits.
allowed-tools	Read,Write,Edit,mcp__stability-ai__stability-ai-generate-image,mcp__ideogram__generate_image