Impeccable is a design skill framework for AI coding agents, offering a single setup flow and 24 commands to guide frontend design decisions. It begins with `/impeccable init`, which inspects the project and writes `PRODUCT.md` capturing durable product context such as audience, purpose, and constraints. The framework includes 62 deterministic detector rules for identifying AI-generated frontend anti-patterns—like overused fonts (Inter, Arial), purple-to-blue gradients, nested cards, and gray text on colored backgrounds—without requiring an LLM or API key. Commands such as `audit`, `polish`, `critique`, and `layout` allow developers to refine designs, while `live` enables browser-based iteration. Impeccable integrates with multiple AI coding tools including Claude Code, Cursor, Codex, and GitHub Copilot, installing via `npx impeccable install`. It supports provider-specific hooks that run design checks on file edits. The tool also includes telemetry controls, allowing users to opt out of anonymous usage tracking. For teams, Impeccable can be vendored via Git submodules and supports both comp-first and code-first workflows, configurable per project. Documentation and setup guides are available at impeccable.style.