A process for examining Stitch projects and creating a DESIGN.md file that records their visual design system for future screen prompts.

Retrieving Stitch screen details and design assets, then documenting the project's colors and other semantic design choices in DESIGN.md.

It gives later designs a written source of truth for matching the project's existing visual language.

design-md — Skill for Claude Code by google-labs-code

About the project

Stitch Design Skills is a collection of Agent Skills and plugins for Google Stitch, a design tool accessed through the Stitch MCP server. It is for coding agents such as Codex, Antigravity, Gemini CLI, Claude Code, Cursor, and OpenCode, with catalogue entries covering Stitch design, build, and utility workflows.

google-labs-code/stitch-skills · 8,263 stars · on GitHub · stitch.withgoogle.com

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 google-labs-code/stitch-skills --skill design-md

Clone the repo

git clone --depth 1 https://github.com/google-labs-code/stitch-skills

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/google-labs-code/stitch-skills/design-md.svg)](https://agentmods.dev/skills/google-labs-code/stitch-skills/design-md)

Your own site

<a href="https://agentmods.dev/skills/google-labs-code/stitch-skills/design-md"><img src="https://agentmods.dev/badge/skills/google-labs-code/stitch-skills/design-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,731 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

Socket pass 18 Mar 2026
Snyk warn 17 Feb 2026
NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high System Prompt Leakage · line 88
Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.

Fix: Remove any instructions that reveal, print, or output system prompts or internal rules. System instructions should never be exposed to end users.

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	$0.00017	$0.01731
Opus 5	$0.00009	$0.00865
Sonnet 5	$0.00003	$0.00346
Haiku 4.5	$0.00002	$0.00173

Measured 8d ago against content hash eb15f4464652, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, 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

Copies of this mod

4 near-identical copies found in the catalogue:

design-md — 100% identical, 32 lines differ
design-md — 100% identical, 0 lines differ
design-md — 100% identical, 0 lines differ
design-md — 89% identical, 29 lines differ

plugins/stitch-utilities/skills/design-md/SKILL.md · 173 lines

How it starts

The opening of the file, as written. The whole thing — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Stitch DESIGN.md Skill

You are an expert Design Systems Lead. Your goal is to analyze the provided technical assets and synthesize a "Semantic Design System" into a file named DESIGN.md.

Overview

This skill helps you create DESIGN.md files that serve as the "source of truth" for prompting Stitch to generate new screens that align perfectly with existing design language. Stitch interprets design through "Visual Descriptions" supported by specific color values.

Prerequisites

Access to the Stitch MCP Server
A Stitch project with at least one designed screen
Access to the Stitch Effective Prompting Guide: https://stitch.withgoogle.com/docs/learn/prompting/

The Goal

The DESIGN.md file will serve as the "source of truth" for prompting Stitch to generate new screens that align perfectly with the existing design language. Stitch interprets design through "Visual Descriptions" supported by specific color values.

Retrieval and Networking

To analyze a Stitch project, you must retrieve screen metadata and design assets using the Stitch MCP Server tools:

Namespace discovery: Run list_tools to find the Stitch MCP prefix. Use this prefix (e.g., mcp_stitch:) for all subsequent calls.
Project lookup (if Project ID is not provided):
- Call [prefix]:list_projects with filter: "view=owned" to retrieve all user projects
- Identify the target project by title or URL pattern
- Extract the Project ID from the name field (e.g., projects/13534454087919359824)
Screen lookup (if Screen ID is not provided):
- Call [prefix]:list_screens with the projectId (just the numeric ID, not the full path)
- Review screen titles to identify the target screen (e.g., "Home", "Landing Page")
- Extract the Screen ID from the screen's name field
Metadata fetch:
- Call [prefix]:get_screen with both projectId and screenId (both as numeric IDs only)
- This returns the complete screen object including:
  - screenshot.downloadUrl - Visual reference of the design
  - htmlCode.downloadUrl - Full HTML/CSS source code
  - width, height, deviceType - Screen dimensions and target platform
  - Project metadata including designTheme with color and style information

Read the full file on GitHub · 173 lines

Files

What ships with it

2 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.

8d ago First seen · 173 lines · 17 tokens per session scan A eb15f4464652

Subscribe to this mod's changes

design-md is a skill published in the GitHub repository google-labs-code/stitch-skills (8,263 stars, last pushed 21d ago), licensed Apache-2.0. It adds 17 tokens to every session and 1,731 once invoked, about $0.0001 per session on Opus 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.

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design-md