design-lab

design-lab is a skill for Claude Code, Codex from fellipeutaka/leon. It costs 52 tokens per session (7,335 once invoked), scanned A, a copy of design-lab, MIT.

A guided workspace for exploring several user-interface designs before choosing one to build. It includes interviews, temporary variations, feedback, refinement, previews, and implementation planning.

In plain words
What is it for?
Use it to redesign screens or components, create multiple new interface options, gather feedback, and turn the selected design into a build plan.
Why use it?
It helps teams compare different design directions before committing development time to one approach.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/fellipeutaka/leon/design-lab
Any agent
npx skills add fellipeutaka/leon --skill design-lab
Clone the repo
git clone --depth 1 https://github.com/fellipeutaka/leon

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for design-lab

README.md
[![agentmods](https://agentmods.dev/badge/skills/fellipeutaka/leon/design-lab.svg)](https://agentmods.dev/skills/fellipeutaka/leon/design-lab)
Your own site
<a href="https://agentmods.dev/skills/fellipeutaka/leon/design-lab"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/design-lab.svg" alt="Measured on agentmods" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,335 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 97% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00052 $0.07335
Opus 5 $0.00026 $0.03667
Sonnet 5 $0.00010 $0.01467
Haiku 4.5 $0.00005 $0.00734

Measured 5d ago against content hash 965e5a4d9567, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

design-lab scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

97% identical to design-lab — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/design-lab/SKILL.md · 921 lines

How it starts

The opening of the file, as written. The whole thing — 921 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Design Lab Skill

This skill implements a complete design exploration workflow: interview, generate variations, collect feedback, refine, preview, and finalize.

CRITICAL: Cleanup Behavior

All temporary files MUST be deleted when the process ends, whether by:

  • User confirms final design → cleanup, then generate plan
  • User aborts/cancels → cleanup immediately, no plan generated

Never leave .claude-design/ or __design_lab routes behind. If the user says "cancel", "abort", "stop", or "nevermind" at any point, confirm and then delete all temporary artifacts.


Phase 0: Preflight Detection

Before starting the interview, automatically detect:

Package Manager

Check for lock files in the project root:

  • pnpm-lock.yaml → use pnpm
  • yarn.lock → use yarn
  • package-lock.json → use npm
  • bun.lockb → use bun

Framework Detection

Check for config files:

  • next.config.js or next.config.mjs or next.config.tsNext.js
    • Check for app/ directory → App Router
    • Check for pages/ directory → Pages Router
  • vite.config.js or vite.config.tsVite
  • remix.config.jsRemix
  • nuxt.config.js or nuxt.config.tsNuxt
  • astro.config.mjsAstro

Styling System Detection

Check package.json dependencies and config files:

  • tailwind.config.js or tailwind.config.tsTailwind CSS
  • @mui/material in dependencies → Material UI
  • @chakra-ui/react in dependencies → Chakra UI
  • antd in dependencies → Ant Design
  • styled-components in dependencies → styled-components
  • @emotion/react in dependencies → Emotion
  • .css or .module.css files → CSS Modules

Design Memory Check

Look for existing Design Memory file:

  • docs/design-memory.md
  • DESIGN_MEMORY.md
  • .claude-design/design-memory.md

If found, read it and use to prefill defaults and skip redundant questions.

Visual Style Inference (CRITICAL)

DO NOT use generic/predefined styles. Extract visual language from the project:

Read the full file on GitHub · 921 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 921 lines · 52 tokens per session scan A 965e5a4d9567

Subscribe to this mod's changes

design-lab is a skill published in the GitHub repository fellipeutaka/leon (5 stars, last pushed yesterday), licensed MIT. It adds 52 tokens to every session and 7,335 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to design-lab, differing in 1 line, and is treated as a copy.

Related

Other skills, from other repositories

systematic-debugging

Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.

obra/superpowers · 21 tokens

local-ai-agents

Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…

microsoft/ai-agents-for-beginners · 200 tokens

next-cache-components-adoption

Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…

vercel/next.js · 95 tokens

next-cache-components-optimizer

Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…

vercel/next.js · 170 tokens

next-partial-prefetching-adoption

Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…

vercel/next.js · 103 tokens

chronicle

Analyze Copilot session history for standup reports, usage tips, session search, and session reindexing. Use when the user asks for a standup, daily summary, usage tips, workflow recommendations, wants to search or find past sessions by keyword/file/PR, wants to reindex their session store, or asks about deleting…

microsoft/vscode · 72 tokens