UI Designer

Overview

This skill enables systematic extraction of design systems from reference UI images through a multi-step workflow: analyze visual patterns → generate design system documentation → create PRD → produce implementation-ready UI prompts.

When to Use

• User provides UI screenshots, mockups, or design references
• Need to extract color palettes, typography, spacing from existing designs
• Want to generate design system documentation from visual examples
• Building MVP UI that should match reference aesthetics
• Creating multiple UI variations following consistent design principles

Workflow

Step 1: Gather Inputs

Request from user:

• Reference images directory: Path to folder containing UI screenshots/mockups
• Project idea file: Document describing the product concept and goals
• Existing PRD (optional): If PRD already exists, skip Step 3

Step 2: Extract Design System from Images

Use Task tool with general-purpose subagent, providing:

Prompt template from assets/design-system.md:

• Analyze color palettes (primary, secondary, accent, functional colors)
• Extract typography (font families, sizes, weights, line heights)
• Identify component styles (buttons, cards, inputs, icons)
• Document spacing system
• Note animations/transitions patterns
• Include dark mode variants if present

Attach reference images to the subagent context.

Output: Complete design system markdown following the template format

Save to: documents/designs/{image_dir_name}_design_system.md

Step 3: Generate MVP PRD (if not provided)

Use Task tool with general-purpose subagent, providing:

Prompt template from assets/app-overview-generator.md:

• Replace {项目背景} with content from project idea file
• The template guides through: elevator pitch, problem statement, target audience, USP, features list, UX/UI considerations

Interact with user to refine and clarify product requirements