6ef995f8a4
* fix(live): correct the generation shader's capture + halftone on dark and textured surfaces The live-mode "ink-wash" loading shader rendered correctly on light elements but broke on dark and textured ones. Root causes and fixes: - Ground the halftone on the element's own background tone (new u_paper uniform) instead of a fixed cream paper, so dark elements stop flashing bright as the roller passes. - Drive dot size by each cell's contrast from that ground, not absolute darkness, so content (text, buttons) becomes the dots on light and dark alike instead of inverting on dark elements. - Cap the dot radius so a solid dark region stays separated dots rather than flooding into a gold bar. - Parse computed colors by rasterizing through a canvas, so oklch()/color() tokens resolve instead of falling back to white. - Two-stage dissolve (flatten to ground, then dots emerge) so the raw element never bleeds through the band's soft core/trail. - Carry the capture's alpha through the shader so rounded corners and transparent regions show the live backdrop instead of rendering black. - When an element is transparent up to the root but its backdrop comes from an ancestor's image or a covering layer (e.g. a hero art div), capture that ancestor and crop to the element. Fixes the homepage hero heading capturing on white, and embeds the real backdrop in the model upload too. The halftone ground is sampled from just outside the element so it tracks the true backdrop rather than a muddy average of the content. Adds /shader-lab, a standalone harness that runs the real capture + shader pipeline against a matrix of background shapes (light, dark, gradient, image, glass, rounded, and a homepage-hero replica) with raw vs capture+shader side by side. The capture/shader code is copied from live-browser.js and kept in sync. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(live): clear the cached color-parse canvas before each fill Cursor Bugbot (PR #171): cssColorToRgb01 reuses a cached 2D context, so a semi-transparent input (alpha 0<a<1, which isTransparentColor lets through) blended source-over with the previous call's pixel, making the result depend on call history. clearRect before the fill makes each call independent. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Impeccable
The vocabulary you didn't know you needed. 1 skill, 23 commands, and curated anti-patterns for impeccable frontend design.
Quick start: Visit impeccable.style to download ready-to-use bundles.
Why Impeccable?
Anthropic's frontend-design was the first widely-used design skill for Claude. Impeccable started from there.
Every model trained on the same SaaS templates. Skip the guidance and you get the same handful of tells on every project: Inter for everything, purple-to-blue gradients, cards nested in cards, gray text on colored backgrounds, the rounded-square icon tile above every heading.
Impeccable adds:
- 7 domain reference files (view source). Typography, color, motion, spatial, interaction, responsive, UX writing. Load on every command, alongside a brand-vs-product register that adjusts the defaults.
- 23 commands. A shared design vocabulary with your AI:
polish,audit,critique,distill,animate,bolder,quieter, and more. - 27 deterministic anti-pattern rules plus a 12-rule LLM critique pass. CLI and browser extension run the deterministic ones with no LLM and no API key. Each is tied to specific design guidance the skill teaches against.
What's Included
The Skill: impeccable
A comprehensive design skill with 7 domain-specific references (view skill):
| Reference | Covers |
|---|---|
| typography | Type systems, font pairing, modular scales, OpenType |
| color-and-contrast | OKLCH, tinted neutrals, dark mode, accessibility |
| spatial-design | Spacing systems, grids, visual hierarchy |
| motion-design | Easing curves, staggering, reduced motion |
| interaction-design | Forms, focus states, loading patterns |
| responsive-design | Mobile-first, fluid design, container queries |
| ux-writing | Button labels, error messages, empty states |
23 Commands
All commands are accessed through /impeccable:
| Command | What it does |
|---|---|
/impeccable craft |
Full shape-then-build flow with visual iteration |
/impeccable init |
One-time setup: gather design context, write PRODUCT.md and DESIGN.md, configure live mode, recommend next steps |
/impeccable document |
Generate root DESIGN.md from existing project code |
/impeccable extract |
Pull reusable components and tokens into the design system |
/impeccable shape |
Plan UX/UI before writing code |
/impeccable critique |
UX design review: hierarchy, clarity, emotional resonance |
/impeccable audit |
Run technical quality checks (a11y, performance, responsive) |
/impeccable polish |
Final pass, design system alignment, and shipping readiness |
/impeccable bolder |
Amplify boring designs |
/impeccable quieter |
Tone down overly bold designs |
/impeccable distill |
Strip to essence |
/impeccable harden |
Error handling, i18n, text overflow, edge cases |
/impeccable onboard |
First-run flows, empty states, activation paths |
/impeccable animate |
Add purposeful motion |
/impeccable colorize |
Introduce strategic color |
/impeccable typeset |
Fix font choices, hierarchy, sizing |
/impeccable layout |
Fix layout, spacing, visual rhythm |
/impeccable delight |
Add moments of joy |
/impeccable overdrive |
Add technically extraordinary effects |
/impeccable clarify |
Improve unclear UX copy |
/impeccable adapt |
Adapt for different devices |
/impeccable optimize |
Performance improvements |
/impeccable live |
Visual variant mode: iterate on elements in the browser |
Use /impeccable pin <command> to create standalone shortcuts (e.g., pin audit creates /audit).
Usage Examples
/impeccable audit blog # Audit blog hub + post pages
/impeccable critique landing # UX design review
/impeccable polish settings # Final pass before shipping
/impeccable harden checkout # Add error handling + edge cases
Or use /impeccable directly with a description:
/impeccable redo this hero section
Anti-Patterns
The skill includes explicit guidance on what to avoid:
- Don't use overused fonts (Arial, Inter, system defaults)
- Don't use gray text on colored backgrounds
- Don't use pure black/gray (always tint)
- Don't wrap everything in cards or nest cards inside cards
- Don't use bounce/elastic easing (feels dated)
See It In Action
Visit impeccable.style to see before/after case studies of real projects transformed with Impeccable commands.
Installation
Option 1: CLI installer (Recommended)
From the root of your project, run:
npx impeccable skills install
This auto-detects your harness and writes the build compiled for it to the right location (.claude/skills/, .cursor/skills/, etc.). Works with Cursor, Claude Code, Gemini CLI, Codex CLI, and every other supported tool. Reload your harness afterward.
Claude Code users can alternatively install the plugin with /plugin marketplace add pbakaus/impeccable. The general-purpose npx skills add pbakaus/impeccable also works, though it installs one shared build for all harnesses rather than the one compiled for yours.
Option 2: Download from Website
Visit impeccable.style, download the ZIP for your tool, and extract to your project.
Option 3: Copy from Repository
Cursor:
cp -r dist/cursor/.cursor your-project/
Note: Cursor skills require setup:
- Switch to Nightly channel in Cursor Settings → Beta
- Enable Agent Skills in Cursor Settings → Rules
Claude Code:
# Project-specific
cp -r dist/claude-code/.claude your-project/
# Or global (applies to all projects)
cp -r dist/claude-code/.claude/* ~/.claude/
OpenCode:
cp -r dist/opencode/.opencode your-project/
Pi:
cp -r dist/pi/.pi your-project/
Gemini CLI:
cp -r dist/gemini/.gemini your-project/
Note: Gemini CLI skills require setup:
- Install preview version:
npm i -g @google/gemini-cli@preview- Run
/settingsand enable "Skills"- Run
/skills listto verify installation
Codex CLI:
# Project-local
cp -r dist/agents/.agents your-project/
mkdir -p your-project/.codex
cp -r dist/codex/.codex/agents your-project/.codex/
# Or user-wide
mkdir -p ~/.agents/skills
cp -r dist/agents/.agents/skills/* ~/.agents/skills/
mkdir -p ~/.codex
cp -r dist/codex/.codex/agents ~/.codex/
GitHub Copilot:
cp -r dist/github/.github your-project/
Trae:
# Trae China (domestic version)
cp -r dist/trae/.trae-cn/skills/* ~/.trae-cn/skills/
# Trae International
cp -r dist/trae/.trae/skills/* ~/.trae/skills/
Note: Trae has two versions with different config directories:
- Trae China:
~/.trae-cn/skills/- Trae International:
~/.trae/skills/After copying, restart Trae IDE to activate the skills.
Rovo Dev:
# Project-specific
cp -r dist/rovo-dev/.rovodev your-project/
# Or global (applies to all projects)
cp -r dist/rovo-dev/.rovodev/skills/* ~/.rovodev/skills/
Qoder:
# Project-specific
cp -r dist/qoder/.qoder your-project/
# Or global (applies to all projects)
cp -r dist/qoder/.qoder/skills/* ~/.qoder/skills/
Usage
Once installed, every command runs through the single /impeccable skill:
/impeccable audit # Find issues
/impeccable polish # Final cleanup
/impeccable distill # Remove complexity
/impeccable critique # Full design review
Type /impeccable alone to see the full command list.
Most commands accept an optional argument to focus on a specific area:
/impeccable audit the header
/impeccable polish the checkout form
If you reach for one command often, pin it with /impeccable pin audit to get /audit as a standalone shortcut.
Note: Codex uses skills here, not /prompts: commands. Open /skills or type $impeccable. Repo-local installs live in .agents/skills/; user-wide installs live in ~/.agents/skills/. GitHub Copilot uses .github/skills/. Restart the tool if a newly installed skill does not appear.
CLI
Impeccable includes a standalone CLI for detecting anti-patterns without an AI harness:
npx impeccable detect src/ # scan a directory
npx impeccable detect index.html # scan an HTML file
npx impeccable detect https://example.com # scan a URL (Puppeteer)
npx impeccable detect --fast --json . # regex-only, JSON output
The detector catches 24 issues across AI slop (side-tab borders, purple gradients, bounce easing, dark glows) and general design quality (line length, cramped padding, small touch targets, skipped headings, and more).
Supported Tools
Community & Ecosystem
Join the community and ecosystem conversations:
- GitHub Discussions: file bugs, request features, and help newcomers.
- Impeccable on npm: grab the CLI, follow releases, and star the package.
- Follow @pbakaus on Twitter for release notes, sample lint reports, and video highlights of new rules.
Contributing
See DEVELOP.md for contributor guidelines and build instructions.
License
Apache 2.0. See LICENSE.
The impeccable skill builds on Anthropic's original frontend-design skill. See NOTICE.md for attribution.
Created by Paul Bakaus