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heading-rhythm (quality): a heading binds to the content it introduces, so its rendered space above must exceed its space below. Browser-only: measures real getBoundingClientRect gaps (margin collapsing, flex rows, and section padding make authored margins untrustworthy), merges eyebrow labels into the heading cluster, requires same-column edges, and exempts first-in-container headings, bounded bands, and small cards. Fires only when 2+ headings on a page invert the rhythm. blinking-cursor (slop, advisory): a decorative blinking caret (solid block, underscore bar, or block glyph) bound to an infinite blink animation in the landing region of a page. Real editable surfaces (contenteditable, role=textbox, inputs) are exempt; round pulsing dots stay with the pulsing-dot rule. Verified against eval corpus repros: heading-rhythm fires on the val-a18 observability sample Paul flagged (6 headings, 0px above vs 40px below) and blinking-cursor on the val-a19 hero terminal cursor; 10 other samples across both runs stay clean. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
89 lines
2.7 KiB
Markdown
89 lines
2.7 KiB
Markdown
# Impeccable CLI
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Detect UI anti-patterns and design quality issues from the command line. Scans HTML, CSS, JSX, TSX, Vue, and Svelte files for 53 deterministic rules, including AI-generated UI tells, accessibility violations, and general design quality problems.
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## Quick Start
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```bash
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# Install skills into your AI harness (Claude, Cursor, Gemini, etc.)
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npx impeccable skills install
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# Non-interactive install for a specific scope
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npx impeccable skills install -y --providers=claude,codex --scope=project
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# First command to run inside your AI harness
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/impeccable init
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# Update skills to the latest version
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npx impeccable skills update
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# Install or update skills without hook manifests
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npx impeccable skills install --no-hooks
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# Link skills from a Git submodule checkout
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npx impeccable skills link --source=.impeccable --providers=claude,cursor
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# List all available commands
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npx impeccable skills help
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# Scan files or directories for anti-patterns
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npx impeccable detect src/
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# Scan a live URL (requires Puppeteer)
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npx impeccable detect https://example.com
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# JSON output for CI/tooling
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npx impeccable detect --json src/
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# Deprecated compatibility flag; full scan still runs
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npx impeccable detect --fast src/
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```
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## What It Detects
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**AI Slop Tells**: patterns that scream "AI generated this":
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- Side-tab accent borders, gradient text on headings
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- Purple/violet gradients and cyan-on-dark palettes
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- Dark mode with glowing accents, border + border-radius clashes
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**Typography Issues**: overused fonts (Inter, Roboto), flat type hierarchy, single font families
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**Color & Contrast**: WCAG AA violations, gray text on colored backgrounds, pure black/white
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**Layout & Composition**: nested cards, monotonous spacing, everything-centered layouts
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**Motion**: bounce/elastic easing, layout property transitions
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**Quality**: tiny body text, cramped padding, long line lengths, small touch targets
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53 deterministic detector rules in total. See the full catalog at [impeccable.style/slop](https://impeccable.style/slop).
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## Exit Codes
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- `0`: no issues found
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- `2`: anti-patterns detected
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## Options
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```
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impeccable detect [options] [file-or-dir-or-url...]
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--fast Regex-only mode (skip jsdom, faster but less accurate)
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--json Output findings as JSON
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--help Show help
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```
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## Requirements
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- Node.js 22.12+
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- `jsdom` (included as dependency, used for HTML scanning)
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- `puppeteer` (optional, only needed for URL scanning)
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## Part of Impeccable
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This CLI is part of [Impeccable](https://impeccable.style), a cross-provider design skill pack for AI-powered development tools. The full suite includes 23 commands for Claude, Cursor, GitHub Copilot, Gemini, Codex, and more.
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## License
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[Apache 2.0](https://github.com/pbakaus/impeccable/blob/main/LICENSE)
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