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decisions-design-references

Playbook for Aceternity UI, Refero MCP, Mobbin MCP, and Godly when building or polishing web UI — what each source is for and how agents should use it.

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<!-- GLOBAL_UI_UX_REFERENCE -->

Global interface source

Before using this skill for interface work, read the current global ui-ux-system skill (~/.agents/skills/ui-ux-system/SKILL.md), especially its Paul's rules, settled taste rules, and Definition of Done - UI. Those rules are authoritative and override conflicting guidance here. Aesthetic recipes are opt-in: use them only when the brief explicitly calls for them and they earn their place. This skill adds only its specialized guidance.

Design Reference Sources

DecisionsAI does not replace these products — it tells agents which tool for which job and how to wire MCPs.

Quick pick

NeedUse
Paste-ready React/Tailwind/Motion componentsAceternity UI — ui.aceternity.com
Real shipped screens + DESIGN.md tokensRefero MCP — refero.design/mcp (Pro)
Pattern library + flows (mobile/web)Mobbin MCP — api.mobbin.com/mcp (Pro, OAuth)
Visual inspiration onlyGodly — godly.website (manual screenshots/links)
ECC implementation tastefrontend-design, ui-ux-system

“10x” — if someone lists five sites and the fifth is “10x”, it is usually slang or a misheard name, not a fifth MCP. Ask the user for the exact URL unless they confirm a product.


Aceternity UI (no MCP)

  • Site: https://ui.aceternity.com
  • Stack: React, Tailwind CSS, Framer Motion
  • Workflow: open the component page → copy the published code → adapt to project structure (paths, imports, design tokens).
  • Agent tip: put the component URL in the prompt: “Implement the bento grid from ui.aceternity.com/components/…”
  • Do not invent Aceternity APIs — only use what’s on the page.

Refero (official MCP + optional skill)

  • MCP docs: https://refero.design/mcp
  • Library: styles.refero.design (DESIGN.md extracts)
  • Requires: Refero Pro; browser OAuth on first MCP call.
  • MCP gives: search over 130k+ screens and flows with structured metadata (patterns, layouts).
  • Optional skill: npx skills add https://github.com/referodesign/refero_skill
  • Example prompts:
    • “Find onboarding flows from fintech apps”
    • “Show how Linear handles empty states”
    • “Extract typography and spacing for a dense settings page”
  • Paste extracted tokens into the repo as CSS variables or tailwind theme extension.

Mobbin (official HTTP MCP)

  • Site: https://mobbin.com
  • Endpoint: https://api.mobbin.com/mcp
  • Requires: Mobbin Pro (~€10/month); OAuth via browser on first use.
  • Claude Code setup:
    claude mcp add mobbin --scope user --transport http https://api.mobbin.com/mcp
    
  • Cursor: add to ~/.cursor/mcp.json:
    {
      "mcpServers": {
        "mobbin": {
          "url": "https://api.mobbin.com/mcp"
        }
      }
    }
    
  • Use for: navigation patterns, paywalls, onboarding, mobile-specific layouts.
  • Cite which pattern you copied and why it fits the ticket.

Godly (gallery only)

  • Site: https://godly.website
  • No API, no MCP.
  • Workflow: user or agent picks 1–3 gallery pages → attach screenshots or URLs → describe what to borrow (typography mood, color, density).
  • Do not claim Godly integration — treat as human-curated mood board.

Decisions integration

  • Ideation first: decisions-ui-ideation
  • Setup: ~/.decisions/harness/mcp-setup-design.sh and mcp-recommendations.json
  • Workflows: UI steps should list this skill + frontend-design
  • Evidence: in result packets, list references used (Refero query, Mobbin pattern, Aceternity URL, Godly link).

When MCP is unavailable

  1. Use repo existing UI as primary reference.
  2. Aceternity component URLs for concrete components.
  3. Godly links/screenshots for direction.
  4. State in Blockers: or Summary: that Refero/Mobbin need Pro + MCP setup — do not fake live search results.

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