Superdesign: the design skill for Claude Code, Cursor and any coding agent

Stop shipping AI-slop UI. Coding agents write great code and mediocre interfaces: generic layouts, default shadcn everything, no taste. Superdesign is the skill that gives your agent design judgment, so the UI it ships actually looks considered.

Install it once and your agent (Claude Code, Cursor, Codex, and 70+ others) can find real design direction, set up a design system, and generate + iterate high-quality UI drafts on an infinite canvas, all without leaving your terminal.

Powered by superdesign.dev, the AI product design agent.

Install

npx skills add superdesigndev/superdesign-skill

This works for any of the 70+ supported coding agents. Then install the CLI it drives:

npm install -g @superdesign/cli@latest
superdesign login

Use it

Just talk to your agent:

/superdesign help me redesign this settings page so it doesn't look like default AI slop

/superdesign set up a design system from my current codebase

/superdesign improve the design of my dashboard

The skill handles the rest: it reads your code for context, gathers real style references, and produces design drafts you can branch and refine.

Core scenarios (what this skill handles)

1. Help me design X (feature/page/flow)
2. Set design system
3. Help me improve design of X (make it not look AI-generated)

Tooling overview

A) Inspiration & Style Tools (generic, always available)

Use these to discover style direction, references, and brand context:

• Search prompt library (style/components/pages)

  superdesign search-prompts --keyword "<keyword>" --json
  superdesign search-prompts --tags "style" --json
  superdesign search-prompts --tags "style" --keyword "<style keyword>" --json
  

• Get full prompt details

  superdesign get-prompts --slugs "<slug1,slug2,...>" --json
  

• Extract brand guide from a URL

  superdesign extract-brand-guide --url https://example.com --json
  

B) Canvas Design Tools

Use design agent to generate high quality design drafts:

• Create project (supports prompt / prompt file / HTML)
• Create design draft
• Iterate design draft (replace / branch)
• Plan flow pages → execute flow pages
• Fetch specific design draft

Overall SOP for designing features on top of existing app:

1. Investigate existing UI, workflow
2. Setup design system file if not exist yet
3. Requirements gathering: use askQuestion tool to clarify requirements with users (Optionally use Inspiration tool to find inspiration when needed)
4. Ask user whether ready to design in superdesign OR implement UI directly
5. If yes to superdesign 5.1 Create/update a pixel perfect html replica of current UI of page that we will design on top of in .superdesign/replica_html_template/<name>.html (html should only contain & reflect how UI look now, the actual design should be handled by superdesign agent) 5.2 Create project with this replica html + design system guide 5.3 Start desigining by iterating & branching design draft based on designDraft ID returned from project

Always-on rules

• Design system should live at: .superdesign/design-system.md
• If .superdesign/design-system.md is missing, run Design System Setup first.
• Use askQuestion to ask high-signal questions (constraints, taste, tradeoffs).
• Always use --json for machine parsing.

replica_html_template rules (Canvas only)

The purpose of replica html template is creating a lightweight version of existing UI so design agent can iterate on top of it (Since superdesign doesn't have access to your codebase directly, this is important context)

Overall process for designing features on top of existing app:

1. Identify & understand existing UI of page related
2. Create/update a pixel perfect replica html in .superdesign/replica_html_template/<name>.html (Only replicate how UI look now, do NOT design)

• If design task is redesign profile page, then replicate current profile page UI pixel perfectly
• If design task is add new button to side panel, identify which page side panel is using, then replicate that page UI pixel perfectly

replica_html_template = BEFORE state (what exists now). It provides context for SuperDesign agent. Actual design will be done via superdesign agent, by passing the prompt

The replica_html_template must contain ONLY UI that currently exists in the codebase.

• DO NOT design or improve anything in the replica_html_template
• DO NOT add placeholder sections like <!-- NEW FEATURE - DESIGN THIS -->
• DO create pixel-perfect replica of current UI state
• Save to: .superdesign/replica_html_template/<name>.html

Naming & Reuse

Naming convention Name replica_html_template for reusability: Use the page route (e.g., home.html, settings-profile.html, dashboard.html) This makes it easy to identify if a page_template already exists.

Before creating a replica_html_template:

1. Check if .superdesign/replica_html_template/ already contains a matching file
2. If exists: reuse it or update to reflect the latest existing UI
3. If not exists: create the neww file

Example: Adding a "Book Demo" section to home page

BAD approach:

<!-- replica_html_template includes a sketched Book Demo section -->
<section class="book-demo">
  <!-- DESIGN THIS - Add CTA here -->
  <h3>Book a Demo</h3>
  <button>Schedule</button>
</section>

GOOD approach:

<!-- replica_html_template is pure replica of existing home page (hero + projects) -->

Then in the iterate command: 1/ create project passing this replica html 2/ create design draft based on design draft id

1) Design System Setup

Step 0 — Ask user (one question)

"Do you want to create a new design system or extract from the current codebase?"

A) Extract from codebase

1. Investigate codebase:
   • Product context: what is being built, target users, core value proposition, key user journeys and page structure
   • design tokens, typography, colors, spacing, radius, shadows
   • motion/animation patterns
   • example components usage + implementation patterns
2. Write standalone design system to:
   • .superdesign/design-system.md
   • Must be implementable without the codebase

B) Create a new design system (to improve current UI)

1. Investigate codebase to understand:
   • Product context: what is being built, target users, core value proposition, key user journeys and page structure
   • needed pages/components
2. Gather inspirations (generic tools):
   • superdesign search-prompts --tags "style" --json
   • superdesign get-prompts --slugs ... --json
   • optional: superdesign extract-brand-guide --url ... --json
3. Interview user (askQuestion) to choose direction
4. Write:
   • .superdesign/design-system.md (product context + UX flows + visual design, adapted to references)

2) Designing X (feature/page/flow)

Example workflow - Add feature to existing page

1. Investigate existing design and Ask targeted questions (askQuestion) about requirements + taste
2. After clarifying, Ask user whether ready to design in superdesign OR implement UI directly
3. If design in superdesign 3.1 Ensure .superdesign/design-system.md exists (setup if missing) 3.2 Identify page most relevant, and build a pixel-perfect replica in replica_html_template:
   • .superdesign/replica_html_template/<page>-<feature>.html 3.3 Create project with replica_html_template (returns draftId):

   superdesign create-project \
     --title "<feature>" \
     --html-file .superdesign/replica_html_template/<file>.html \
     --set-project-prompt-file .superdesign/design-system.md \
     --json
   

   → Note: draftId in response is the baseline draft 3.4 Branch designs from baseline (use draftId from step 3.3)

   superdesign iterate-design-draft \
     --draft-id <draftId> \
     -p "Dark theme with neon accents" \
     -p "Minimal with more whitespace" \
     -p "Bold gradients and shadows" \
     --mode branch \
     --json
   

3.5 Share design title & preview URL → collect feedback → iterate

Advanced usage

Design multiple page OR a full user journey

Execute:

superdesign execute-flow-pages \
  --draft-id <draftId> \
  --pages '[{"title":"Signup","prompt":"..."},{"title":"Payment","prompt":"..."}]' \
  --json

Get HTML reference from a draft

superdesign get-design --draft-id <draftId> --output ./design.html

Quick reference (key commands)

# Inspirations
superdesign search-prompts --keyword "<keyword>" --json
superdesign search-prompts --tags "style" --json
superdesign get-prompts --slugs "<slug1,slug2>" --json
superdesign extract-brand-guide --url https://example.com --json

# Canvas - Create project
# Options: -s/--set-project-prompt (inline), --set-project-prompt-file (from file)
superdesign create-project --title "X" --set-project-prompt "..." --json
superdesign create-project --title "X" --set-project-prompt-file .superdesign/design-system.md --json
superdesign create-project --title "X" --html-file ./index.html --set-project-prompt-file .superdesign/design-system.md --json

# Iterate: replace mode (single variation, updates in place)
superdesign iterate-design-draft --draft-id <id> -p "..." --mode replace --json

# Iterate: Explore multiple versions & variations (each prompt = one variation, prompt should be just directional, do not specify color, style, let superdesign design expert fill in details, you just give direction)
superdesign iterate-design-draft --draft-id <id> -p "dark theme" -p "minimal" -p "bold" --mode branch --json

# Iterate: Auto explore (only give exploration direction, and l