A design guide and asset kit for building interfaces for nxv, the Nix Version Index. It defines a dark developer-tool style, including colours, fonts, layout patterns, and reusable interface components.

Use it when designing or implementing nxv pages, mockups, prototypes, or other interface work that should match the Blueprint look.

It removes guesswork when creating nxv screens or prototypes and keeps the visual design consistent. It gives developers named design choices to follow instead of choosing styles from scratch.

How utensils/nxv configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to utensils/nxv. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/utensils/nxv/main/.agents/skills/nxv-design/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/utensils/nxv

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/utensils/nxv/nxv-design/github.svg)](https://agentmods.dev/skills/utensils/nxv/nxv-design)

Your own site

<a href="https://agentmods.dev/skills/utensils/nxv/nxv-design"><img src="https://agentmods.dev/badge/skills/utensils/nxv/nxv-design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/utensils/nxv/nxv-design"><img src="https://agentmods.dev/badge/skills/utensils/nxv/nxv-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 588 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00064	$0.00588
Opus 5.5	$0.00026	$0.00235
Sonnet 5.5	$0.00013	$0.00118
Haiku 4.5	$0.00006	$0.00059

Measured 2mo ago against content hash 71adc5c2f6ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nxv-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

The scan reads SKILL.md. This mod also ships 19 executable files (_ds_bundle.js, components/core/Button.d.ts, components/core/Callout.d.ts, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/nxv-design/SKILL.md · 25 lines

How it starts

The opening of the file, as written. The whole thing — 25 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Read the README.md file within this skill, and explore the other available files.

If creating visual artifacts (slides, mocks, throwaway prototypes, etc.), copy assets out and create static HTML files for the user to view. If working on production code, you can copy assets and read the rules here to become an expert in designing with this brand.

If the user invokes this skill without any other guidance, ask them what they want to build or design, ask some questions, and act as an expert designer who outputs HTML artifacts or production code, depending on the need.

Quick orientation

Look: "Blueprint" — dark-only, deep cool-navy canvas with a faint 48px engineering grid (masked to fade behind content), the colourful Nix snowflake as the hero mark, JetBrains Mono as the signature voice, one Nix-blue accent.
Tokens: link styles.css (it @imports everything in tokens/). Reference semantic aliases — --surface-page, --surface-glass, --text, --accent, --border, --ring-focus, --grid-image — not raw hexes. All colour is oklch.
Fonts: fonts/inter-var.woff2 (UI/body) + fonts/jetbrains-mono-var.woff2 (data/code/headings). Real binaries, no substitutes.
Assets: assets/nix-snowflake.svg (hero mark + favicon), assets/nxv-logo-dark.svg / nxv-logo-light.svg (bracket monogram).
Icons: Lucide-style 2px-stroke line icons (stroke="currentColor", no fill). No emoji, no icon font.
Voice: lowercase terminal-native labels, second-person imperative prose, dry wit, concrete numbers and real package names. Mono for anything machine-shaped. Eyebrows read like // code comments.

Components

Compiled to _ds_bundle.js under window.NxvDesignSystem_0fa7ce. Core: Button, Chip, Kbd, StatusPill, Panel, Metric, SegmentedToggle, Callout, Toast. Product: SearchPrompt, Terminal, VersionBadge, PackageRow, PackageCard, VersionTimeline, ActivityBars. Each component has a .prompt.md with a usage example. ui_kits/search-app/ is a full interactive reference; Landing.html is the marketing page.

Read the full file on GitHub · 25 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 25 lines · 64 tokens per session scan A 71adc5c2f6ee

Subscribe to this mod's changes

nxv-design is a skill published in the GitHub repository utensils/nxv (140 stars, last pushed 2mo ago), licensed MIT. It adds 64 tokens to every session and 588 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

CSS and styling Design and UX Frontend cli nix nixos nixpkgs package-manager

nxv-design next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
nxv-designutensils/nxv	Skill	140	2mo ago	MIT	A	64	Claude Code
frontend-philosophykdcokenny/ocx	Skill	980	1mo ago	MIT	A	36	Claude Code, Codex
frontend-designHmbown/CodeWhale	Skill	41k	5d ago	MIT	A	21	Claude Code, Codex
ambience-skillcode-yeongyu/lazycodex	Skill	3.9k	yesterday	MIT	A	132	Claude Code, Codex
interaction-skillcode-yeongyu/lazycodex	Skill	3.9k	yesterday	MIT	A	104	Claude Code, Codex
designlang-tokensManavarya09/design-extract	Skill	4.8k	yesterday	MIT	A	30	Claude Code
accessibilityericrisco/rsc-harness	Skill	503	2d ago	MIT	A	86	Claude Code, Codex

nxv: Skill for Claude Code