Stitch Semantic Design System Generator

---
name: stitch-design-taste
description: "Semantic Design System Skill for Google Stitch. Generates agent-friendly DESIGN.md files that enforce premium, anti-generic UI standards — strict typography, calibrated color, asymmetric layouts, perpetual micro-motion, and hardware-accelerated performance."
---
# Stitch Design Taste — Semantic Design System Skill

## Overview
This skill generates `DESIGN.md` files optimized for Google Stitch screen generation. It translates the battle-tested anti-slop frontend engineering directives into Stitch's native semantic design language — descriptive, natural-language rules paired with precise values that Stitch's AI agent can interpret to produce premium, non-generic interfaces.

The generated `DESIGN.md` serves as the **single source of truth** for prompting Stitch to generate new screens that align with a curated, high-agency design language. Stitch interprets design through **"Visual Descriptions"** supported by specific color values, typography specs, and component behaviors.

## Prerequisites
- Access to Google Stitch via [labs.google.com/stitch](https://labs.google.com/stitch)
- Optionally: Stitch MCP Server for programmatic integration with Cursor, Antigravity, or Gemini CLI

## The Goal
Generate a `DESIGN.md` file that encodes:
1. **Visual atmosphere** — the mood, density, and design philosophy
2. **Color calibration** — neutrals, accents, and banned patterns with hex codes
3. **Typographic architecture** — font stacks, scale hierarchy, and anti-patterns
4. **Component behaviors** — buttons, cards, inputs with interaction states
5. **Layout principles** — grid systems, spacing philosophy, responsive strategy
6. **Motion philosophy** — animation engine specs, spring physics, perpetual micro-interactions
7. **Anti-patterns** — explicit list of banned AI design clichés

## Analysis & Synthesis Instructions

### 1. Define the Atmosphere
Evaluate the target project's intent. Use evocative adjectives from the taste spectrum:
- **Density:** "Art Gallery Airy" (1–3) → "Daily App Balanced" (4–7) → "Cockpit Dense" (8–10)
- **Variance:** "Predictable Symmetric" (1–3) → "Offset Asymmetric" (4–7) → "Artsy Chaotic" (8–10)
- **Motion:** "Static Restrained" (1–3) → "Fluid CSS" (4–7) → "Cinematic Choreography" (8–10)

Default baseline: Variance 8, Motion 6, Density 4. Adapt dynamically based on user's vibe description.

### 2. Map the Color Palette
For each color provide: **Descriptive Name** + **Hex Code** + **Functional Role**.

**Mandatory constraints:**
- Maximum 1 accent color. Saturation below 80%
- The "AI Purple/Blue Neon" aesthetic is strictly BANNED — no purple button glows, no neon gradients
- Use absolute neutral bases (Zinc/Slate) with high-contrast singular accents
- Stick to one palette for the entire output — no warm/cool gray fluctuation
- Never use pure black (`#000000`) — use Off-Black, Zinc-950, or Charcoal

### 3. Establish Typography Rules
- **Display/Headlines:** Track-tight, controlled scale. Not screaming. Hierarchy through weight and color, not just massive size
- **Body:** Relaxed leading, max 65 characters per line
- **Font Selection:** `Inter` is BANNED for premium/creative contexts. Force unique character: `Geist`, `Outfit`, `Cabinet Grotesk`, or `Satoshi`
- **Serif Ban:** Generic serif fonts (`Times New Roman`, `Georgia`, `Garamond`, `Palatino`) are BANNED. If serif is needed for editorial/creative contexts, use only distinctive modern serifs: `Fraunces`, `Gambarino`, `Editorial New`, or `Instrument Serif`. Serif is always BANNED in dashboards or software UIs
- **Dashboard Constraint:** Use Sans-Serif pairings exclusively (`Geist` + `Geist Mono` or `Satoshi` + `JetBrains Mono`)
- **High-Density Override:** When density exceeds 7, all numbers must use Monospace

### 4. Define the Hero Section
The Hero is the first impression and must be creative, striking, and never generic:
- **Inline Image Typography:** Embed small, contextual photos or visuals directly between words or letters in the headline. Images sit inline at type-height, rounded, acting as visual punctuation. This is the signature creative technique
- **No Overlapping:** Text must never overlap images or other text. Every element occupies its own clean spatial zone
- **No Filler Text:** "Scroll to explore", "Swipe down", scroll arrow icons, bouncing chevrons are BANNED. The content should pull users in naturally
- **Asymmetric Structure:** Centered Hero layouts BANNED when variance exceeds 4
- **CTA Restraint:** Maximum one primary CTA. No secondary "Learn more" links

### 5. Describe Component Stylings
For each component type, describe shape, color, shadow depth, and interaction behavior:
- **Buttons:** Tactile push feedback on active state. No neon outer glows. No custom mouse cursors
- **Cards:** Use ONLY when elevation communicates hierarchy. Tint shadows to background hue. For high-density layouts, replace cards with border-top dividers or negative space
- **Inputs/Forms:** Label above input, helper text optional, error text below. Standard gap spacing
- **Loading States:** Skeletal loaders matching layout dimensions — no generic circular spinners
- **Empty States:** Composed compositions indicating how to populate data
- **Error States:** Clear, inline error reporting

### 6. Define Layout Principles
- No overlapping elements — every element occupies its own clear spatial zone. No absolute-positioned content stacking
- Centered Hero sections are BANNED when variance exceeds 4 — force Split Screen, Left-Aligned, or Asymmetric Whitespace
- The generic "3 equal cards horizontally" feature row is BANNED — use 2-column Zig-Zag, asymmetric grid, or horizontal scroll
- CSS Grid over Flexbox math — never use `calc()` percentage hacks
- Contain layouts using max-width constraints (e.g., 1400px centered)
- Full-height sections must use `min-h-[100dvh]` — never `h-screen` (iOS Safari catastrophic jump)

### 7. Define Responsive Rules
Every design must work across all viewports:
- **Mobile-First Collapse (< 768px):** All multi-column layouts collapse to single column. No exceptions
- **No Horizontal Scroll:** Horizontal overflow on mobile is a critical failure
- **Typography Scaling:** Headlines scale via `clamp()`. Body text minimum `1rem`/`14px`
- **Touch Targets:** All interactive elements minimum `44px` tap target
- **Image Behavior:** Inline typography images (photos between words) stack below headline on mobile
- **Navigation:** Desktop horizontal nav collapses to clean mobile menu
- **Spacing:** Vertical section gaps reduce proportionally (`clamp(3rem, 8vw, 6rem)`)

### 8. Encode Motion Philosophy
- **Spring Physics default:** `stiffness: 100, damping: 20` — premium, weighty feel. No linear easing
- **Perpetual Micro-Interactions:** Every active component should have an infinite loop state (Pulse, Typewriter, Float, Shimmer)
- **Staggered Orchestration:** Never mount lists instantly — use cascade delays for waterfall reveals
- **Performance:** Animate exclusively via `transform` and `opacity`. Never animate `top`, `left`, `width`, `height`. Grain/noise filters on fixed pseudo-elements only

### 9. List Anti-Patterns (AI Tells)
Encode these as explicit "NEVER DO" rules in the DESIGN.md:
- No emojis anywhere
- No `Inter` font
- No generic serif fonts (`Times New Roman`, `Georgia`, `Garamond`) — distinctive modern serifs only if needed
- No pure black (`#000000`)
- No neon/outer glow shadows
- No oversaturated accents
- No excessive gradient text on large headers
- No custom mouse cursors
- No overlapping elements — clean spatial separation always
- No 3-column equal card layouts
- No generic names ("John Doe", "Acme", "Nexus")
- No fake round numbers (`99.99%`, `50%`)
- No AI copywriting clichés ("Elevate", "Seamless", "Unleash", "Next-Gen")
- No filler UI text: "Scroll to explore", "Swipe down", scroll arrows, bouncing chevrons
- No broken Unsplash links — use `picsum.photos` or SVG avatars
- No centered Hero sections (for high-variance projects)

## Output Format (DESIGN.md Structure)

```markdown
# Design System: [Project Title]

## 1. Visual Theme & Atmosphere
(Evocative description of the mood, density, variance, and motion intensity.
Example: "A restrained, gallery-airy interface with confident asymmetric layouts
and fluid spring-physics motion. The atmosphere is clinical yet warm — like a
well-lit architecture studio.")

## 2. Color Palette & Roles
- **Canvas White** (#F9FAFB) — Primary background surface
- **Pure Surface** (#FFFFFF) — Card and container fill
- **Charcoal Ink** (#18181B) — Primary text, Zinc-950 depth
- **Muted Steel** (#71717A) — Secondary text, descriptions, metadata
- **Whisper Border** (rgba(226,232,240,0.5)) — Card borders, 1px structural lines
- **[Accent Name]** (#XXXXXX) — Single accent for CTAs, active states, focus rings
(Max 1 accent. Saturation < 80%. No purple/neon.)

## 3. Typography Rules
- **Display:** [Font Name] — Track-tight, controlled scale, weight-driven hierarchy
- **Body:** [Font Name] — Relaxed leading, 65ch max-width, neutral secondary color
- **Mono:** [Font Name] — For code, metadata, timestamps, high-density numbers
- **Banned:** Inter, generic system fonts for premium contexts. Serif fonts banned in dashboards.

## 4. Component Stylings
* **Buttons:** Flat, no outer glow. Tactile -1px translate on active. Accent fill for primary, ghost/outline for secondary.
* **Cards:** Generously rounded corners (2.5rem). Diffused whisper shadow. Used only when elevation serves hierarchy. High-density: replace with border-top dividers.
* **Inputs:** Label above, error below. Focus ring in accent color. No floating labels.
* **Loaders:** Skeletal shimmer matching exact layout dimensions. No circular spinners.
* **Empty States:** Composed, illustrated compositions — not just "No data" text.

## 5. Layout Principles
(Grid-first responsive architecture. Asymmetric splits for Hero sections.
Strict single-column collapse below 768px. Max-width containment.
No flexbox percentage math. Generous internal padding.)

## 6. Motion & Interaction
(Spring physics for all interactive elements. Staggered cascade reveals.
Perpetual micro-loops on active dashboard components. Hardware-accelerated
transforms only. Isolated Client Components for CPU-heavy animations.)

## 7. Anti-Patterns (Banned)
(Explicit list of forbidden patterns: no emojis, no Inter, no pure black,
no neon glows, no 3-column equal grids, no AI copywriting clichés,
no generic placeholder names, no broken image links.)
```

## Best Practices
- **Be Descriptive:** "Deep Charcoal Ink (#18181B)" — not just "dark text"
- **Be Functional:** Explain what each element is used for
- **Be Consistent:** Same terminology throughout the document
- **Be Precise:** Include exact hex codes, rem values, pixel values in parentheses
- **Be Opinionated:** This is not a neutral template — it enforces a specific, premium aesthetic

## Tips for Success
1. Start with the atmosphere — understand the vibe before detailing tokens
2. Look for patterns — identify consistent spacing, sizing, and styling
3. Think semantically — name colors by purpose, not just appearance
4. Consider hierarchy — document how visual weight communicates importance
5. Encode the bans — anti-patterns are as important as the rules themselves

## Common Pitfalls to Avoid
- Using technical jargon without translation ("rounded-xl" instead of "generously rounded corners")
- Omitting hex codes or using only descriptive names
- Forgetting functional roles of design elements
- Being too vague in atmosphere descriptions
- Ignoring the anti-pattern list — these are what make the output premium
- Defaulting to generic "safe" designs instead of enforcing the curated aesthetic