impeccable
The design language that makes your AI harness better at design.
Impeccable is a design guidance AI sub-agent that helps coding agents produce higher-quality frontend work by eliminating common AI design tells and enforcing best practices. It provides a unified /impeccable skill with 23 specialized commands—including init, audit, critique, polish, and bolder—alongside 59 deterministic detector rules that catch overused fonts, nested cards, poor color choices, and accessibility issues. The system integrates directly into AI coding tools through skills, hooks, and a standalone CLI, offering both proactive guidance during setup and reactive linting as files are edited.
Key Features
Use Cases
- 01Run /impeccable init on new projects to establish design context and avoid generic SaaS templates
- 02Use /impeccable audit to catch accessibility, performance, and responsive design issues before shipping
- 03Apply /impeccable bolder to landing pages that feel too safe or /impeccable quieter to tone down overly aggressive designs
- 04Execute /impeccable harden on checkout flows to add error handling, i18n, and edge-case coverage
- 05Integrate npx impeccable detect into CI/CD pipelines to enforce design standards across team contributions
- 06Pin frequently used commands (/impeccable pin audit) to create shortcuts like /audit for faster iteration
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impeccable — FAQ
What is Impeccable?+
Impeccable is a design guidance AI sub-agent that provides 23 commands and 59 deterministic rules to help coding agents produce better frontend designs. It started as an extension of Anthropic's frontend-design skill and adds setup flows, anti-pattern detection, and live browser iteration to eliminate common AI design tells.
How do I install Impeccable?+
Run npx impeccable install from your project root to auto-detect your AI coding tool (Cursor, Claude Code, Codex, Grok Build, etc.) and install the skill. You can also use Git submodule, plugin marketplace commands (/plugin marketplace add pbakaus/impeccable for Claude Code, grok plugin install pbakaus/impeccable#plugin for Grok Build), or manual copy from the dist/ folder.
Which AI coding tools does Impeccable support?+
Impeccable works with Cursor, Claude Code, GitHub Copilot, Gemini CLI, Codex CLI, Grok Build, OpenCode, Pi, Kiro, Trae, Rovo Dev, Qoder, Mistral Vibe, and Google Antigravity. The npx impeccable install command detects your environment and installs the correct provider build.
Does Impeccable require API keys?+
No API keys are required. The 59 deterministic detector rules run locally via the CLI and browser extension with no LLM calls. The /impeccable commands run inside your existing AI coding tool and use that tool's LLM connection.
Is Impeccable free?+
Yes, Impeccable is open source under the Apache 2.0 license and free to use. The standalone CLI, all 23 commands, and the detector rules are available at no cost.
How do I use Impeccable after installation?+
Start with /impeccable init to capture your product and design context, then use /impeccable <command> for specific tasks like audit, critique, polish, or bolder. Type /impeccable alone to see the full command list, and use /impeccable pin <command> to create standalone shortcuts for frequently used operations.
How do I install impeccable?+
Open the source repository on GitHub and follow its README. impeccable is a agent — MCP Agents Market links you directly to the official repo.
Is impeccable free?+
impeccable is an open-source project hosted on GitHub. Check the repository for its license and any usage requirements.