What is design-system?

A workflow for creating a brand and design system for an Expo and React Native Power Apps mobile app. It produces written design guidance, reusable style tokens, and an HTML gallery for previewing them.

Defining or refreshing the app's visual system, exporting Tamagui tokens, and generating a static design gallery.

It gives screens a shared visual reference for colors, fonts, spacing, and components instead of leaving each screen to make separate design decisions.

design-system — Skill for Claude Code by microsoft

About the project

microsoft/power-platform-skills is a plugin marketplace containing reusable skills, agents, and commands for developing with Microsoft Power Platform. Developers use it to build and deploy Power Pages sites, model-driven Power Apps, and related solutions through Claude Code or GitHub Copilot. The catalogue entries are the marketplace's included skills, agents, plugins, and other agent components.

microsoft/power-platform-skills · 1,042 stars · on GitHub · aka.ms

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 microsoft/power-platform-skills --skill design-system

Clone the repo

git clone --depth 1 https://github.com/microsoft/power-platform-skills

Made for: Claude Code.

Or install mobile-app, the plugin that ships this one along with the rest of its 23 skills, 5 agents.

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/microsoft/power-platform-skills/design-system/github.svg)](https://agentmods.dev/skills/microsoft/power-platform-skills/design-system)

Your own site

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

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 9,758 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 warn 7 Sept 2026

SkillSpector: 3 findings, up to medium

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 →

medium Excessive Agency · line 6
Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.

Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
medium MCP Rug Pull · line 23
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 642
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

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	$0.00034	$0.09758
Opus 5.5	$0.00014	$0.03903
Sonnet 5.5	$0.00007	$0.01952
Haiku 4.5	$0.00003	$0.00976

Measured 12d ago against content hash 9b2f586c57dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

design-system 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 12d 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.

plugins/mobile-apps/skills/design-system/SKILL.md · 811 lines

How it starts

The opening of the file, as written. The whole thing — 811 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plugin check: Run node "${PLUGIN_ROOT}/scripts/check-version.js" - if it outputs a message, show it to the user before proceeding.

Shared instructions: shared-instructions.md — read first.

Design System

Entry routing: use the shared App feature entry points preflight before the workflow below.

Before reading brand state, bind working_dir through app-working-directory.md. Use that root for every shell call and absolute file-tool path, including history, rollback, previews, and runtime wiring in the referenced workflows.

Read-only --history / --diff and standalone brand generation without an app remain here.

Source of truth for every screen built in a Power Apps mobile app. Produces three artifacts:

brand/design-system.md — full spec (palette, typography, spacing, components, negatives)
brand/tokens.ts — importable Tamagui token export
brand/design-system.html — deterministic visual gallery (zero LLM cost)

Design-system and Tamagui integration are complementary, not alternatives. /design-system owns user-facing brand/design decisions and preview artifacts; /create-mobile-app Step 9b applies references/tamagui-integration.md as internal implementation plumbing so those decisions become Tamagui tokens, aliases, and provider props. The old separate tamagui-design-system skill existed before this split was clear; keeping it separate made users choose implementation details and added prompt surface. Do not reintroduce it as a user-invocable skill.

When to use

Step 6.5 — auto-invoked from /create-mobile-app after scaffold + pa app init, before screen builders
Standalone — /design-system callable any time to create or refresh a brand system
Refresh — /design-system --refresh <dimension> to change one aspect
Reskin — /design-system --reskin for full visual layer swap
Dark mode — /design-system --add-dark-mode to derive + wire dark theme

Read the full file on GitHub · 811 lines

Files

What ships with it

23 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.

12d ago Changed · +142 lines 9b2f586c57dc
14d ago Changed d4d0e3a94387
16d ago Changed · +12 lines 056309f40f37
23d ago Changed · +2 lines 15aa9a2797ce
1mo ago Changed · +14 lines 54b87fc06efd
1mo ago Changed 81c7430a5dee
1mo ago First seen · 641 lines · 34 tokens per session scan A 5c580bb8eee6

Subscribe to this mod's changes

design-system is a skill published in the GitHub repository microsoft/power-platform-skills (1,042 stars, last pushed today), licensed MIT. It adds 34 tokens to every session and 9,758 once invoked, about $0.0001 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.

Design and UX Mobile claude-code-plugin claude-code-skills code-apps power-apps power-pages power-platform

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