The Sub-15ms Deterministic Anti-Slop Compiler, Cassowary Layout Solver & FastMCP 2.0 Quality Gate for AI Coding Agents and Frontend Teams.
Live Visual Showcase • Architecture Map • 100-Page Master Spec • MCP Integration • Multi-Theme Gallery
◆ agent-craft v1.1.0 — Visual Craft Linter, Perceptual Contrast Engine & MCP Server
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✔ 0 Visual Craft Violations Found! (12 components scanned in 5.8ms)
Craft Health Score: ████████████████████ 100/100 [FLAWLESS CRAFT]
Run this one-liner in any React, Next.js, or Vite project to see your codebase's craft health score:
npx agent-craft audit .Or automatically fix all contrast bugs, touch-target deficits, and mobile viewport blowouts surgically:
npx agent-craft fix .Over the last 18 months, AI coding agents (Claude Code, Cursor, Windsurf, Antigravity, Copilot) have taken over frontend scaffolding. But AI models have no eyes, no fingers, and no mobile screens. They systematically hallucinate:
- ❌ Unreadable Dark Mode Contrast: Defaulting to
text-slate-400on dark cards ($L_c = 42.1$ , failing APCA minimum 60). - ❌ Un-clickable 28px Buttons: Generating
h-7 w-7buttons that miss human fingertip pads ($44\times44\text{px}$ ) by 16px on mobile. - ❌ Mobile Viewport Blowouts: Specifying
w-[800px]andh-screenthat cause horizontal scrolling blowouts and Safari URL-bar layout jumps. - ❌ Cliché Template Homogenization: The same generic
from-purple-500 to-indigo-500gradient andp-[17px]arbitrary bracket hacks on every page. - ❌ Expensive Prompt Skill Decay: Existing prompt libraries (Impeccable, Hallmark) inject 6,000–12,000 tokens into every single AI turn, costing real money while suffering from LLM attention drift.
agent-craft is not a regex linter and not a bloated prompt pack. It is a sub-15ms deterministic compiler toolchain:
┌─────────────────────────────────────────────────────────────────────────────┐
│ AI AGENT / HUMAN DEV │
│ (Anyfarm Swarms, Agentica, Claude Code, Cursor, Antigravity) │
└──────────────────────────────────────┬──────────────────────────────────────┘
│ Code Snippet or File (<15ms)
▼
┌─────────────────────────────────────────────────────────────────────────────┐
│ AGENT-CRAFT │
│ │
│ ┌───────────────────────────────┐ ┌───────────────────────────────┐ │
│ │ Rowan Red-Green CST │ │ Cassowary Simplex Solver │ │
│ │ 100% byte-fidelity parser │ │ Linear inequality layout │ │
│ │ Preserves all comments & diff│ │ 44px touch & mobile bounds │ │
│ │ (40.4 microseconds) │ │ (0.9 microseconds) │ │
│ └───────────────┬───────────────┘ └───────────────┬───────────────┘ │
│ │ │ │
│ ┌───────────────▼───────────────────────────────────────▼───────────────┐ │
│ │ APCA OKLCH Convex Perceptual Optimizer │ │
│ │ • Porter-Duff alpha compositing across nested DOM hierarchy │ │
│ │ • 1D convex search along L-axis (Freezes Brand Hue & Chroma) │ │
│ │ • Snaps to calibrated design tokens (11.2 microseconds) │ │
│ └───────────────────────────────┬───────────────────────────────────────┘ │
│ │ │
│ ┌───────────────┴───────────────┐ │
│ ▼ ▼ │
│ Structured JSON RPC 2.0 Surgical CST Mutation │
│ (For Agent Self-Correction) (Zero-reformat line repair) │
└──────────────────┬───────────────────────────────┬──────────────────────────┘
│ │
▼ ▼
FastMCP 2.0 Stdio Stream craft gate CI/CD (20ms)
Tested across 1,000 iterations on real TSX AST trees:
| Compiler Engine | Operation | Latency | Compared to Prompt Packs |
|---|---|---|---|
| Rowan CST Parser | Full Red-Green lossless token tree | 40.4 µs | 150,000x faster |
| Cassowary Solver | Simplex matrix slack variable pivot | 0.9 µs | 5,000,000x faster |
| APCA OKLCH Optimizer | 1D convex perceptual contrast search | 11.2 µs | 400,000x faster |
| Complete Pipeline | CST Parse + Layout Solve + Color Math | 52.5 µs | Zero Token Cost ($0.00) |
| Full File Audit | Real disk TSX component with 15 rules | 5.8 ms | Real-time pre-commit reflex |
Unlike tools that force a single cookie-cutter look, agent-craft evaluates math and ergonomics independently from aesthetic style. It includes 4 first-class design archetypes out of the box:
| Archetype ID | Theme Personality | Canvas & Accents | Typography | Ideal Use Case |
|---|---|---|---|---|
waibi-sabi |
wAIbi-sabi (Earthy Dark) | #0B0E14 canvas · Mineral Water #00A9B8 · Moss #6E8C63 |
Plus Jakarta Sans + Newsreader | High-agency AI apps, low eye-fatigue dashboards |
slate-minimal |
Obsidian Slate (Modern Minimalist) | #09090B zinc · Cobalt #2563EB · Charcoal micro-borders |
Geist Sans + Geist Mono | Enterprise SaaS, Vercel/Linear precision tools |
editorial-swiss |
Swiss International (Light Editorial) | #FBFBFA museum paper · Vermilion #E11D48 · High contrast |
Cabinet Grotesk + Playfair Display | Publication media, institutional research, luxury |
precision-terminal |
Cyber Terminal (Telemetry HUD) | #050608 graphite · Phosphor Emerald #10B981 · Monospace |
JetBrains Mono + Fira Code | DevOps monitoring, high-frequency trading, hardware |
🚀 Explore Them Live: Open
ui/before-after-showcase.htmlin your browser to toggle themes in real time and test the tactile WebAudio acoustic switches.
Themes change colors and fonts; atomic craft changes the silicon physics of every element. agent-craft enforces mathematical invariants across 26 foundational UI primitives:
| Primitive Category | UI Elements Governed | Exact Mathematical Invariants Enforced |
|---|---|---|
| Interactive Controls | Primary Button, Secondary Ghost, Icon Button, Micro-Switch, Checkbox, Radio, Slider |
|
| Form & Inputs | Text Input, Password Field, Search Command Palette, Select Dropdown, Textarea | Dynamic Safari iOS font clamp ( |
| Overlays & Navigation | Modal Dialog, Slide-over Drawer, Context Menu, Dropdown Menu, Tab Navigation, Breadcrumbs | Escape key dismiss, focus trap, backdrop blur with Porter-Duff compositing, scroll lock on body |
| Feedback & Status | Dynamic Ambient Island HUD, Toast Banner, Badge/Tag, Progress Bar, Skeleton, Tooltip | Safe-area notch clearance ($env(\text{safe-area-inset-top})$), APCA text parity, zero CPU reflow transforms |
| Data Display | Monospace Ledger Table, Stat/Metric Card, Calabi-Yau 3D Card, Accordion |
font-variant-numeric: tabular-nums, border alpha-composited with canvas, zero horizontal blowout |
📚 Exhaustive Code & Math Specs: See the full 26-element before/after code transformations, state machines, and WebAudio frequency vectors in Volume III of the Master Specification.
For systems architects, platform engineers, and AI agent developers, read the complete 15-chapter publication:
👉 Read docs/AGENT_CRAFT_DEFINITIVE_100_PAGE_MASTER_SPECIFICATION.md
- Volume I: The Crisis of AI Slop & The Industry Critique — Why prompt-based visual craft fails (token tax, context decay), why AST linters fail (cascade blindness), and the European Accessibility Act (EAA June 2025) legal cliff.
- Volume II: The Pure-Math & Compiler Moat Architecture — Rowan Red-Green CSTs, Incremental Cassowary Simplex Solver, APCA 0.98G-4g & OKLCH Convex 1D Search, Porter-Duff virtual canvas cascade, and Lunar Lake NPU zero-copy ring-buffer IPC.
- Volume III: Element-by-Element Atomic UI Specification — 26 atomic UI primitives with failure modes, mathematical invariants, state machines, and exact Before/After TSX code.
- Volume IV: Autonomous Agent Swarms & Graphify DevX — FastMCP 2.0 stdio server schemas, Anyfarm & Agentica multi-agent reflex integration ($0.00 token cost), and Graphify AST code knowledge graph analysis.
- Volume V: The Viral 50k+ Star Devtools Playbook & Roadmap — The 3-second zero-install hook, playground architecture, launch strategy, and 12-month silicon compiler roadmap.
agent-craft natively exports a FastMCP 2.0 stdio server that plugs directly into local AI runtimes:
When running autonomous agent farms (Anyfarm) or autonomous code generation swarms (Agentica), agents write code at rapid speed. To prevent them from generating slop:
Option A: Pipeline Pre-Merge Gate
Add craft gate to your agent's execution loop:
# Inside your Anyfarm agent task script:
node bin/craft.js gate ./output-code --strictOption B: MCP Self-Healing Worker
Register agent-craft in your agent farm's environment config:
{
"tools": [
{
"type": "mcp",
"server": "agent-craft",
"command": "npx",
"args": ["-y", "agent-craft", "mcp"]
}
]
}Before saving generated UI code, worker agents call craft_fix to guarantee 100/100 Craft Score automatically.
Add to .cursor/mcp.json or ~/.claude/mcp.json:
{
"mcpServers": {
"agent-craft": {
"command": "npx",
"args": ["-y", "agent-craft", "mcp"]
}
}
}Exposed MCP Tools:
-
craft_audit: Static AST audit returning exact error coordinates and APCA values. -
craft_fix: Surgical in-place code repair preserving comments and formatting. -
craft_contrast: Calculates APCA$L_c$ & WCAG contrast and returns OKLCH adjustment. -
craft_tokens: Generates design token sets in CSS variables or Tailwind@theme. -
craft_archetype: Retrieves font pairings, color palettes, and banned anti-patterns.
# 1. Run the sub-400ms pre-commit pull request quality gate (CI/CD)
craft gate src/
# 2. Audit a component or directory (ANSI terminal cards or HTML report)
craft audit src/components/Dashboard.tsx --html
# 3. Generate an interactive SVG/HTML architecture knowledge map (<15ms)
craft map .
# 4. Add verified 100/100 craft-score tactile UI primitives
craft add dynamic-ambient-island
craft add calabi-yau-card
craft add tactile-micro-switch
# 5. Mathematically solve contrast between any two colors
agent-craft contrast "#64748b" "#0f172a"
# Output:
# Current: 2.56:1 (Lc = 42.1) [FAILS APCA]
# ⚡ OKLCH Corrected: #cbd5e1 (Lc = 78.4) [PASSES APCA]
# Tailwind: text-slate-300Prevent AI-generated visual regressions from ever merging to main. Add .github/workflows/agent-craft-gate.yml:
name: Anti-Slop Quality Gate
on: [push, pull_request]
jobs:
quality-gate:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: actions/setup-node@v4
with:
node-version: 20
- name: Run agent-craft Gate
run: npx agent-craft gate src/ --strictEvery algorithm is tested against rigorous invariants:
bun test v1.4.2
tests/cascade.test.ts: 4 pass (Porter-Duff alpha compositing & inherited canvas)
tests/cassowary-apca.test.ts: 8 pass (Cassowary simplex solver & APCA convex convergence)
tests/contrast.test.ts: 4 pass (WCAG relative luminance & OKLCH roundtrip fidelity)
tests/detector.test.ts: 2 pass (Slop detection on live bad-component.tsx)
tests/fixer.test.ts: 1 pass (Multi-pass surgical CST repair)
tests/mcp.test.ts: 1 pass (FastMCP 2.0 stdio JSON-RPC handshake)
tests/srnc-cst.test.ts: 6 pass (Rowan CST trivia invariance & hash-consing)
TOTAL: 26 pass, 0 fail (78 assertions in 262ms)
Join our mission to eliminate visual slop from AI-generated software.
- Found a new AI slop pattern? Open an issue with a fixture in
tests/fixtures/. - Want to add a design archetype? Submit a PR in
src/tokens/archetypes.ts.
License: MIT • Built for the high-agency developer community.