A DESIGN.md authoring tool based on Google's open format for documenting a design system, meaning the visual rules used across an interface. It combines exact design values with explanations of how and why to use them.

Use it to create or maintain a design system, check color contrast, compare revisions, or export design values for Tailwind or W3C DTCG JSON.

It gives coding agents a shared reference for colors, spacing, typography, and other visual decisions, while helping check accessibility and detect changes between versions.

design-md — Skill for Claude Code and Codex by jscholz

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add jscholz/hermes-agent-workflow --skill design-md

Clone the repo

git clone --depth 1 https://github.com/jscholz/hermes-agent-workflow

Made for: Claude Code, Codex.

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/jscholz/hermes-agent-workflow/design-md/github.svg)](https://agentmods.dev/skills/jscholz/hermes-agent-workflow/design-md)

Your own site

<a href="https://agentmods.dev/skills/jscholz/hermes-agent-workflow/design-md"><img src="https://agentmods.dev/badge/skills/jscholz/hermes-agent-workflow/design-md/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/jscholz/hermes-agent-workflow/design-md"><img src="https://agentmods.dev/badge/skills/jscholz/hermes-agent-workflow/design-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,846 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.

Origin 88% copy Near-identical to another mod 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	$0.00067	$0.01846
Opus 5	$0.00034	$0.00923
Sonnet 5	$0.00013	$0.00369
Haiku 4.5	$0.00007	$0.00185

Measured 8d ago against content hash 6aafe265bab8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

design-md 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 8d ago.

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.

Origin

This is a copy

88% identical to design-md — 24 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/creative/design-md/SKILL.md · 197 lines

How it starts

The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DESIGN.md Skill

DESIGN.md is Google's open spec (Apache-2.0, google-labs-code/design.md) for describing a visual identity to coding agents. One file combines:

YAML front matter — machine-readable design tokens (normative values)
Markdown body — human-readable rationale, organized into canonical sections

Tokens give exact values. Prose tells agents why those values exist and how to apply them. The CLI (npx @google/design.md) lints structure + WCAG contrast, diffs versions for regressions, and exports to Tailwind or W3C DTCG JSON.

When to use this skill

User asks for a DESIGN.md file, design tokens, or a design system spec
User wants consistent UI/brand across multiple projects or tools
User pastes an existing DESIGN.md and asks to lint, diff, export, or extend it
User asks to port a style guide into a format agents can consume
User wants contrast / WCAG accessibility validation on their color palette

For purely visual inspiration or layout examples, use popular-web-designs instead. This skill is for the formal spec file itself.

File anatomy

---
version: alpha
name: Heritage
description: Architectural minimalism meets journalistic gravitas.
colors:
  primary: "#1A1C1E"
  secondary: "#6C7278"
  tertiary: "#B8422E"
  neutral: "#F7F5F2"
typography:
  h1:
    fontFamily: Public Sans
    fontSize: 3rem
    fontWeight: 700
    lineHeight: 1.1
    letterSpacing: "-0.02em"
  body-md:
    fontFamily: Public Sans
    fontSize: 1rem
rounded:
  sm: 4px
  md: 8px
  lg: 16px
spacing:
  sm: 8px
  md: 16px
  lg: 24px
components:
  button-primary:
    backgroundColor: "{colors.tertiary}"
    textColor: "#FFFFFF"
    rounded: "{rounded.sm}"
    padding: 12px
  button-primary-hover:
    backgroundColor: "{colors.primary}"
---

## Overview

Architectural Minimalism meets Journalistic Gravitas...

## Colors

- **Primary (#1A1C1E):** Deep ink for headlines and core text.
- **Tertiary (#B8422E):** "Boston Clay" — the sole driver for interaction.

## Typography

Public Sans for everything except small all-caps labels...

## Components

`button-primary` is the only high-emphasis action on a page...

Read the full file on GitHub · 197 lines

Files

What ships with it

1 file 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.

templates/starter.md 2.5 KB

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.

8d ago First seen · 197 lines · 67 tokens per session scan A 6aafe265bab8

Subscribe to this mod's changes

design-md is a skill published in the GitHub repository jscholz/hermes-agent-workflow (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 67 tokens to every session and 1,846 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to design-md, differing in 24 lines, and is treated as a copy.

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design-md