Impeccable 4.1 is here:

core: -critique results more reliably prints in chat before asking you questions

• the design hook nags less, and ignores can be recorded once
• reduced-motion guidance restored

greenfield design:

• switch between comps of your page/app before any code or skip mockups and go straight to code
• steer ideation to be bolder or safer in the interactive question tool
• mockups for new pages of an existing site/app stay more consistent
• much better fallback for agents without image generation

native apps:

• ios and android builds get reviewed against native conventions
• polish collects native evidence instead of asking for browser screenshots
• web-only checks stop firing on native code

platforms and setup:

• windows: installs, the decision page, and the roll all work now
• plugin installs: the four subagents actually load (they silently never did)
• support for @NousResearch hermes agent and @antigravity

design issue detection:

• no false low-contrast on gradient backgrounds, image backgrounds, or covered text
• data-impeccable-ignore silences only the element you put it on
• broken-image warnings stop firing on commented-out code
• blade files show up in directory scans
• paths with spaces or quotes stop breaking commands

live mode:

• works on ddev, valet, and other non-localhost dev hosts
• svelte variants render again (broke due to svelte upstream changes)
• copy edits survive long pages

43 prs since the last release - great time to upgrade or try out the latest: npx impeccable install

Impeccable: The missing design vocabulary for agents

Source: https://impeccable.style/

Detects and removes AI slop.

59 checks catch the defaults agents keep reaching for before they become your design.

23 commands give you a shared design vocabulary with your AI. Each names one kind of intervention:/typesetfor type,/distillfor complexity,/auditfor production quality. Pick any to see it in action, orbrowse the full reference →

Give direction in chat. Refine the result on the page.

Every change lands in your source.

mainClaudex Cocursor

Agent threadWorking treeYou

/impeccable polishthe pricing page. Keep our sharp corners and sober palette. Remove the AI tells.

Agent

I’ll polish the page within its existing design system, then run the detector before I hand it back.

DESIGN.md loadedExisting system preserved

4 tells foundAI beige · italic serif · side-tab · pulsing dot

Written to source0 detector findings

Agent

Starting Live Mode against the running app. I’ll open the page, then wait for element picks and page-level steering.

Live helper startedPicker injected into the app

localhost:3000 openedProduction source connected

Waiting for inputPick an element or steer the whole page

/impeccableChoose a command

BrowserLive previewlocalhost:3000

Generating variants…

1 / 3

Variant 3 written to source

Ask a model to be creative and it builds its favorite idea, every run. So Impeccable deals challengers: human-reviewed worlds, each a complete graphic system with laws of its own. They compete against the ideas the model derives from your product, and the direction that wins takes the build, fully committed. The hand below is dealt live from the 177 highest-rated worlds in the deck by the same roll API the skill uses.Why dice? Read the research →

Psst…the deck grows every week in Pro →

01### Respects your design system.

Inherits your tokens, components, and conventions instead of overwriting them. New work fits the system, not the model’s defaults.

›Walking src/…

✓src/styles/tokens.css14 colors, 6 font sizes, 7 spacing steps

✓tailwind.config.tstheme.extend merged

✓src/components/34 components

· Button: primary, secondary, ghost, destructive

· Card: 3 variants, 8px / 16px radii

· Input, Select, Dialog, Toast, Table…

✓DESIGN.mdbrand rules loaded

→Matching your system. Not inventing one.

02### Real product context.

Captures the brief once, inPRODUCT\.md. Every command reads it before designing.

UsersSREs on call, reading fast, often in the dark.

ModeOperate. Design serves the task.

Brand voiceCalm, clinical, no hype.

Anti-referencesPurple gradients. Glassmorphism. “Boost your productivity.”

03### Travels as DESIGN.md.

/impeccable documentwrites one in theGoogle Stitch format. Your visual system becomes portable.

WordmarkSpaced 400

IM

Avenir Next

BodyRegular 400

Aa

Avenir Next

Components34

PrimaryGhost

Email address

Readable by every DESIGN.md-aware tool.

04### Knows what the surface is for.

A landing page should persuade. A dashboard should help someone work. Impeccable names the mode before it designs.

ExperienceLet the work lead

05### Block slop before it ships.

Hooks inspect each UI edit and send findings straight back to the agent. The same detector can fail a PR.

1Edit landsAgent updates the hero.

2Hook returns two findingsAI beige · clipped label

✓Agent corrects the fileSecond pass: clean

Deep stop audit0 findings · PR ready

Explore the detector lab →

Get started

Install via

On the GitHub Copilot app? Impeccable isbuilt in. Skip the install and enable it underSettings → Experimental.

npx impeccable install

Installs the build tailored to your harness and model. RequiresNode 22.12+.

Why one command, many buildsimpeccableClaude Codehooks + subagentCursorpre-edit hookGemini CLI+ Gemini-tuned slop rulesCodex CLI+ Codex-tuned slop rulesSame skill, recompiled per target. The part that matters: builds for models with known tells carry extra slop rules banning that model’s habits. The Gemini build kills its image-on-hover motion; the Codex build refuses ghost-cards and over-rounding. Native hook wiring and a subagent ship too, where the tool supports them.

First run · in your agent chat

/impeccable init

Works with Cursor, Claude Code, GitHub Copilot, Gemini CLI, Codex CLI, Grok Build, and every other major AI coding harness.

Read the setup guide·See what’s new·Got questions?

Learn more:Getting started·Designing with Impeccable·command docs