# Impeccable

Impeccable turns design direction into commands a coding agent can call, so vague requests such as bolder, quieter or polish land on a specific target. It also supplies a review command that scores design against usability heuristics and a slop detector built from 62 deterministic rules, with no LLM or API key, that flags interface tells recurring across models. It is strongest on existing pages and components; building new pages is the harder mode.

Impeccable turns design direction into commands a coding agent can call, so vague requests such as bolder, quieter or polish land on a specific target. It also supplies a review command that scores design against usability heuristics and a slop detector built from 62 deterministic rules, with no LLM or API key, that flags interface tells recurring across models. It is strongest on existing pages and components; building new pages is the harder mode.

Impeccable is a command set for coding agents that steers design with words such as polish and bolder, reviews interfaces with critique and audit, and flags templated design tells before shipping using 62 deterministic rules. With the same model, Fable 5.1, and the same brief for a fourteen-room family guesthouse, the page without Impeccable took the tasteful default of a cream page, thin serif and pill buttons, while with it the page was built around one picture of the house at night seen from the water. It is strongest on interfaces that already exist; building new pages is the harder mode.

Impeccable is a command set for coding agents that steers design with words such as polish and bolder, reviews interfaces with critique and audit, and flags templated design tells before shipping using 62 deterministic rules. With the same model, Fable 5.1, and the same brief for a fourteen-room family guesthouse, the page without Impeccable took the tasteful default of a cream page, thin serif and pill buttons, while with it the page was built around one picture of the house at night seen from the water. It is strongest on interfaces that already exist; building new pages is the harder mode.

Impeccable, a frontend design skill for AI coding agents, ships design constraints as runnable commands and detector rules. Earlier design skills of this kind leaned on the model's own judgment, whereas Impeccable's 62 deterministic detector rules run in a CLI and browser extension with no LLM and no API key. It also provides 24 commands as a shared design vocabulary, and one init step writes durable product truth into PRODUCT.md so later commands keep product facts separate from surface visual direction.

Impeccable, a frontend design skill for AI coding agents, ships design constraints as runnable commands and detector rules. Earlier design skills of this kind leaned on the model's own judgment, whereas Impeccable's 62 deterministic detector rules run in a CLI and browser extension with no LLM and no API key. It also provides 24 commands as a shared design vocabulary, and one init step writes durable product truth into PRODUCT.md so later commands keep product facts separate from surface visual direction.