Design Guidelines Skill

Create the DESIGN_GUIDELINES.md document that defines HOW to design interfaces for your customer. This document drives all UI/UX: components, layouts, animations, colors, typography—everything visual.

Prerequisite: CUSTOMER.md must exist. Design without customer definition is just aesthetic preference. The interface must resonate with WHO you're building for.

Overview

This skill supports both creating new design guidelines and refining existing ones.

This skill guides you through: 0. Prerequisite Check - Verify CUSTOMER.md exists; stop if not

• Deep Analysis - Launch design-research agent to understand ideal design for the customer

• Discovery - Confirm/refine design direction with targeted questions

• Generate Document - Create DESIGN_GUIDELINES.md with full design system

• Automatic Alignment Audit - Opus agent verifies alignment with CUSTOMER.md/BRAND_GUIDELINES.md, fixes issues, repeats until perfect

• Finalization - Add version history once audit passes

Core Philosophy: Anti-AI-Slop

CRITICAL: This skill bakes in the frontend-design skill's principles. Every design guideline must avoid generic AI aesthetics:

What to AVOID (AI Slop)

• Generic fonts: Inter, Roboto, Arial, system fonts, Space Grotesk

• Cliché colors: Purple gradients on white, generic blue CTAs, safe gray palettes

• Predictable layouts: Cookie-cutter grids, template-looking compositions

• Safe choices: Border-radius everywhere, subtle animations, inoffensive everything

• Generic components: Bootstrap/MUI defaults without personality

What to EMBRACE

• Bold aesthetic commitment: Pick an extreme and execute with precision

• Distinctive typography: Characterful fonts that match the product personality

• Intentional color: Dominant colors with sharp accents, not timid even distribution

• Spatial creativity: Asymmetry, overlap, diagonal flow, grid-breaking elements

• Atmospheric details: Textures, gradients, shadows, effects that create depth

The test: Would someone mistake this for a generic template? If yes, it's wrong.

Workflow

Phase 0: Prerequisite Check

CRITICAL: Before anything else, check for CUSTOMER.md:

• Use Glob to search for **/CUSTOMER.md in the current directory

• If NOT found: Stop immediately and inform the user:

"I can't create design guidelines without knowing WHO you're designing for.

Please create your CUSTOMER.md first using /define-customer.

Design without customer definition is just aesthetic preference—it won't resonate with anyone specific."

Do NOT proceed. End the workflow here.

• If found: Read the CUSTOMER.md and extract key context:

• ICP definition (who they are)

• What they value (speed? precision? fun? simplicity?)

• Behavioral traits (patient? impatient? technical? casual?)

• Anti-personas (who they're NOT)

• Any visual/experience hints

IMPORTANT - Pre-fill Recommendations: Use CUSTOMER.md to infer recommended options for all questions:

If CUSTOMER.md says... Recommend...

ICP values "speed", "efficiency", "no patience" Terminal/utilitarian aesthetic, fast animations, dense UI

ICP is technical (developers, engineers) Monospace typography, dark theme, information-dense

ICP values "data", "statistics", "precision" Data terminal aesthetic, clinical colors, sharp geometry

ICP is "fun-seekers", "casual players", "beginners" Playful/soft aesthetic, rounded corners, inviting colors

ICP is "professionals", "executives" Refined/luxury aesthetic, premium typography, restrained palette

ICP values "creativity", "expression" Bold/maximalist aesthetic, unexpected layouts, strong personality

Anti-persona is "corporate" or "enterprise" Avoid generic SaaS look, embrace distinctive character

The goal: User should be able to accept all recommended defaults and get a design system that resonates with their ICP.

Then check for existing DESIGN_GUIDELINES.md:

header: "Existing Design Guidelines Found" question: "I found existing DESIGN_GUIDELINES.md. What would you like to do?" options:

• "Refine it - update based on new insights"
• "Start fresh - create new design guidelines"
• "Review it - just read through what's there"

Phase 1: Deep Analysis

BEFORE asking any questions, launch the design-research agent to deeply analyze the customer profile and determine the ideal design direction.

Launch the Design Research Agent:

Launch Task agent (subagent_type: design-research) with prompt:

"Analyze the customer profile to determine ideal UI/UX design direction.

CUSTOMER.md path: [path found in Phase 0]

Provide your full design analysis covering:

1. Customer Design Psychology
2. Recommended Aesthetic Direction
3. Typography Recommendation
4. Color Direction
5. Geometry & Motion
6. Signature Elements
7. Anti-Patterns for This ICP
8. Design Reference Products

Be specific and decisive. This analysis will inform the entire design system."

The agent will:

• Read CUSTOMER.md and BRAND_GUIDELINES.md (if exists)

• Research industry design patterns and competitors

• Provide comprehensive design analysis with specific recommendations

After agent completes, extract the analysis and use it to:

• Pre-fill ALL question recommendations with high confidence

• Present a summary to the user before discovery questions

Present Analysis Summary:

header: "Design Analysis" question: "Based on your customer profile, here's my recommended design direction. Does this feel right?" [Display: Aesthetic direction, typography, theme, key signature elements] options:

• "Yes - this direction feels right, let's refine details (Recommended)"
• "Mostly - good direction but some things feel off"
• "No - I have a different vision"

If "Yes" or "Mostly", proceed to Phase 2 with agent recommendations as defaults. If "No", ask what's different and adjust recommendations.

Phase 2: Discovery

Use AskUserQuestion for all questions. Put the recommended option FIRST with "(Recommended)" suffix. Use the opus agent's analysis to inform ALL recommendations.

Question 1: Aesthetic Direction

This is the most important question. The entire design system flows from this choice.

Use the opus agent's recommendation as the default. The agent has already analyzed CUSTOMER.md deeply.

header: "Aesthetic Direction" question: "What aesthetic direction fits your product and customer?" options:

• "[Inferred from CUSTOMER.md] (Recommended)"
• "Data terminal - clinical, sharp, information-dense (Bloomberg, trading apps)"
• "Brutally minimal - stark, essential, no decoration"
• "Industrial utilitarian - functional, raw, tool-like"
• "Luxury/refined - premium, elegant, restrained"
• "Editorial/magazine - typographic, editorial, sophisticated"
• "Brutalist/raw - bold, unapologetic, confrontational"
• "Retro-futuristic - nostalgic tech, synthwave, neon"
• "Playful/toy-like - fun, colorful, delightful"
• "Soft/pastel - gentle, approachable, calming"
• "Art deco/geometric - structured, ornamental, patterns"
• "Organic/natural - flowing, earthy, warm"

Question 2: Theme Preference

Use the opus agent's color direction analysis.

header: "Theme" question: "What's your primary theme?" options:

• "[Inferred] (Recommended)"
• "Dark theme - dark backgrounds, light text (more distinctive)"
• "Light theme - light backgrounds, dark text (more accessible)"
• "Both - design for both with theme switching"

Question 3: Typography Character

Use the opus agent's typography recommendation.

header: "Typography" question: "What typographic character fits your brand?" options:

• "[Inferred] (Recommended)"
• "Monospace-forward - technical, precise, data-focused (JetBrains Mono, Fira Code)"
• "Elegant serif - premium, editorial, sophisticated (Playfair, Cormorant)"
• "Bold geometric - strong, modern, impactful (Clash Display, Satoshi)"
• "Rounded/friendly - approachable, soft, inviting (Nunito, Quicksand)"
• "Editorial mix - display headlines with refined body (custom pairing)"
• "Clean sans - neutral but NOT generic (Geist, DM Sans - not Inter/Roboto)"

Question 4: Geometry & Shape

Use the opus agent's geometry & motion analysis.

header: "Geometry" question: "What geometric character defines your UI?" options:

• "[Inferred] (Recommended)"
• "Sharp zero-radius - all corners sharp, no exceptions (precision, clinical)"
• "Minimal/subtle - small radius (4-6px) for polish without softness"
• "Rounded/soft - generous radius (8-16px) for friendliness"
• "Pill shapes - fully rounded buttons/badges for playfulness"
• "Mixed - sharp containers, rounded interactive elements"

Question 5: Information Density

Use the opus agent's analysis of ICP technical level and patience.

header: "Density" question: "How dense should information be?" options:

• "[Inferred] (Recommended)"
• "Dense - information-rich, minimal whitespace (power users)"
• "Balanced - comfortable density with clear hierarchy"
• "Spacious - generous whitespace, breathing room"
• "Editorial - dramatic spacing, statement pieces"

Question 6: Motion Philosophy

Use the opus agent's motion philosophy recommendation.

header: "Motion" question: "What's your animation philosophy?" options:

• "[Inferred] (Recommended)"
• "Instant - <100ms, no unnecessary animation (respects time)"
• "Functional - fast, purposeful, feedback-focused"
• "Subtle - refined micro-interactions, polished feel"
• "Delightful - playful animations, personality-forward"
• "Dramatic - bold transitions, statement animations"

Question 7: Primary Color Direction

header: "Primary Color" question: "What color family anchors your palette?" options:

• "[Inferred if clear signal] (Recommended)"
• "Orange/amber - energy, action, warmth"
• "Blue - trust, calm, professional"
• "Green - growth, success, nature"
• "Purple - creativity, premium, unique"
• "Red/coral - bold, urgent, passionate"
• "Teal/cyan - modern, tech, fresh"
• "Neutral - black/white/gray dominant, accent secondary"
• "Custom - I have specific brand colors"

Question 7b: Brand Colors (If "Custom" selected)

header: "Brand Colors" question: "What are your brand colors?" freeText: true placeholder: "e.g., 'Primary: #F97316 (orange), Secondary: #3B82F6 (blue), Background: #0A0A0B'"

Question 8: Technical Constraints

header: "Tech Stack" question: "What's your frontend tech stack?" options:

• "React + Tailwind (Recommended - most flexible)"
• "React + CSS-in-JS (styled-components, emotion)"
• "React + CSS Modules"
• "Vue + Tailwind"
• "Vanilla HTML/CSS/JS"
• "Other framework" multiSelect: false

Question 9: Signature Elements

header: "Signature" question: "What should be immediately recognizable about your UI? (Select 2-3)" options:

• "[Inferred from aesthetic] (Recommended)"
• "Zero border-radius everywhere"
• "Monospace typography for data"
• "Single dominant accent color"
• "Heavy use of negative space"
• "Custom cursor or micro-interactions"
• "Unique loading states"
• "Distinctive iconography"
• "Gradient treatments"
• "Texture or grain overlays"
• "Bold asymmetric layouts" multiSelect: true

Question 10: Product Context (Free text)

header: "Product Context" question: "Describe your product briefly - what does it do and what's the primary interface?" freeText: true placeholder: "e.g., 'Chess analysis tool - main screen shows a chess board with win percentage overlay. Data-heavy stats pages.'"

Question 11: References (Optional, free text)

header: "References" question: "Any products or websites whose design you admire? (Optional)" freeText: true placeholder: "e.g., 'Linear's clean interface, Stripe's documentation, Notion's typography'"

Question 12+: Gap-Filling

After core questions, verify you have clarity on:

• Aesthetic direction (specific, not vague)

• Typography approach

• Color palette direction

• Geometry decisions

• Motion philosophy

• Signature elements

Keep asking until confident enough to generate a distinctive design system.

Phase 3: Generate Document

Based on the design-research agent's analysis and user's confirmed preferences, generate DESIGN_GUIDELINES.md .

The document should include:

• Identity - User, problem, aesthetic direction, "We Are / We Are NOT", signature elements, core principles

• Design Tokens - Colors (surfaces, text, accent, status, borders), typography (fonts, sizes, weights), spacing, geometry, shadows, animation timings, breakpoints

• Voice & Copy - UI tone, bad/good examples, state copy

• Components - Cards, buttons, inputs, toasts with specific specs

• Layout Patterns - Primary layout philosophy, visual hierarchy

• Motion - Philosophy, orchestrated reveals, loading states

• Anti-Patterns - AI slop to avoid, brand violations, customer-ignoring mistakes

• Ship Checklist - Pre-ship verification items

Incorporate the design-research agent's full analysis into the document—especially the anti-patterns, signature elements, and reference products.

Write DESIGN_GUIDELINES.md to the current working directory.

Phase 4: Automatic Alignment Audit

After generating the document, automatically audit it against CUSTOMER.md and BRAND_GUIDELINES.md to ensure perfect alignment. This is NOT optional—run at least one audit cycle.

Launch the Design Quality Auditor Agent:

Launch Task agent (subagent_type: design-quality-auditor) with prompt:

"Audit DESIGN_GUIDELINES.md for alignment with customer profile and brand guidelines.

Document paths:

• DESIGN_GUIDELINES.md: [path]
• CUSTOMER.md: [path]
• BRAND_GUIDELINES.md: [path] (if exists)

Perform your full audit protocol and report results."

The agent will:

• Read all three documents

• Check customer alignment, brand alignment, internal consistency, completeness

• Report ✅ AUDIT PASSED or ⚠️ ISSUES FOUND with specific fixes

After audit completes:

• If AUDIT PASSED: Proceed to finalization

• If ISSUES FOUND:

• Apply all suggested fixes to DESIGN_GUIDELINES.md

• Run the audit again

• Repeat until AUDIT PASSED (max 3 cycles to prevent infinite loops)

Example audit issue and fix:

ISSUE: Customer Alignment - ICP values "zero patience" but motion philosophy specifies 300ms animations which feels slow for this audience. FIX: Change base animation duration to 100ms, reserve 300ms only for celebratory moments like score reveals.

Phase 5: Finalization

Once audit passes, add version history:

Version History

• v1.0 - [Date] - Initial creation (audit passed)

Usage

Reference this document for ALL UI work. The test: Would your ICP feel this UI was made for them?

Key Principles

Grounded in Customer

• Every design choice should resonate with the ICP

• Reference CUSTOMER.md values when making decisions

• If the ICP values speed, the UI must be fast

• If the ICP is technical, the UI can be dense

Anti-AI-Slop is Non-Negotiable

• Every design system must be distinctive

• Generic choices are wrong by default

• If it looks like a template, it fails

• Bold commitment beats safe mediocrity

Actionable Over Abstract

• Don't just say "be bold" - specify the border-radius

• Every guideline needs exact values

• Ship checklist catches drift

Aesthetic Coherence

• All tokens must serve the chosen direction

• Typography, color, motion, geometry align

• Signature elements appear consistently

• Deviations are intentional, not accidental

Reduce Cognitive Load

• ALWAYS use AskUserQuestion tool when available

• Put recommended option FIRST with "(Recommended)" suffix

• Pre-fill recommendations from agent analysis - user should be able to accept defaults

• Present multi-choice questions to minimize typing

Output Location

Write DESIGN_GUIDELINES.md to the current working directory (or user-specified path).