What is flutter-design-system?

A guide to enforcing a shared design system in Flutter, meaning common rules for colors, spacing, text, borders, and reusable components. It uses project theme or token definitions instead of one-off values.

Use it when building or refactoring Flutter interfaces, choosing theme values, applying design tokens, and replacing raw widgets with approved components.

It helps keep screens visually consistent and prevents hardcoded styling from making future theme changes difficult.

flutter-design-system — Skill for Claude Code and Codex by HoangNguyen

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 HoangNguyen0403/agent-skills-standard --skill flutter-design-system

Clone the repo

git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard

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/hoangnguyen0403/agent-skills-standard/flutter-design-system/github.svg)](https://agentmods.dev/skills/hoangnguyen0403/agent-skills-standard/flutter-design-system)

Your own site

<a href="https://agentmods.dev/skills/hoangnguyen0403/agent-skills-standard/flutter-design-system"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/flutter-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/hoangnguyen0403/agent-skills-standard/flutter-design-system"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/flutter-design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 612 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	$0.00032	$0.00612
Opus 5	$0.00016	$0.00306
Sonnet 5	$0.00006	$0.00122
Haiku 4.5	$0.00003	$0.00061

Measured 9d ago against content hash 81757bb10598, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

flutter-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 9d 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.

skills/flutter/flutter-design-system/SKILL.md · 69 lines

What it actually says

Flutter Design System Enforcement

Priority: P0 (CRITICAL)

Zero tolerance for hardcoded design values.

Phase 0: Context Discovery (MANDATORY)

Before UI refactoring, identify project's Theme Archetype:

Check main.dart: Look for MaterialApp theme configuration.
Determine Pattern:

Theme-Driven (Adaptive): VThemeData(...).toThemeData() or extensive ThemeData overrides → use Theme.of(context).textTheme / theme.textTheme.
Token-Driven (Static): Use static tokens (VTypography.*) only when no global theme bridge exists, or when defining theme itself.

Guidelines

Colors: Use tokens (VColors.*, AppColors.*), never Color(0xFF...) or Colors.red.
Spacing: Use tokens (VSpacing.*), never magic numbers like 16 or 24.
Typography: Prioritize theme.textTheme.* for adaptive UI. Use VTypography.* tokens only for theme definitions or non-contextual logic. Never use inline TextStyle.
Borders: Use tokens (VBorders.*), never raw BorderRadius.
Components: Use DLS widgets (VButton) over raw Material widgets (ElevatedButton) if available.

Detailed Examples

Anti-Patterns

No Hex Colors: Color(0xFF...) strictly forbidden.
No Color Enums: Colors.blue forbidden in UI code.
No Magic Spacing: SizedBox(height: 10) forbidden.
No Inline Styles: TextStyle(fontSize: 14) forbidden.
No Raw Widgets: Don't use ElevatedButton when VButton exists.

mobile-ux-core | flutter/widgets | idiomatic-flutter

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

ElevatedButton
SizedBox
VColors
magic number
Additional task-grounded exact anchors: TextStyle

Files

What ships with it

4 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.

9d ago First seen · 69 lines · 32 tokens per session scan A 81757bb10598

Subscribe to this mod's changes

flutter-design-system is a skill published in the GitHub repository HoangNguyen0403/agent-skills-standard (565 stars, last pushed 3d ago), licensed MIT. It adds 32 tokens to every session and 612 once invoked, about $0.0002 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 2026-09-03.

Design and UX Mobile agent agentic-ai android angular best-practices coding-standards

android-finance-spec

Use when generating, reviewing, or refactoring Android Kotlin code for financial apps that require BigDecimal/String precision, RTL/i18n safety, Kotlin style discipline, and "do not reinvent existing project patterns" constraints.

brycegao/android-finance-spec · 48 tokens

theme-pack-authoring

Build, validate, and install Kiro Crew theme packs -- pack anatomy, the 56-variable palette, role-tagged fonts, the overrides.css allowlist (what installs vs what actually renders), and the install-verify cycle. Use when the user wants to create or edit a theme pack.

kirodotdev/KiroCrew · 64 tokens

image-authoring

Author images and diagrams as code — SVG, Pillow, Excalidraw, mermaid. Load when asked to draw, illustrate, or make an image, icon, logo, poster, or diagram.

kirodotdev/KiroCrew · 45 tokens

mobile-automation

Control Android and iOS devices, emulators and simulators — launch apps, tap, swipe, type, take screenshots, read the accessibility tree. Use when a task involves a mobile device or app, mobile UI testing, or reproducing a bug on a phone.

mobile-next/mobile-mcp · 58 tokens

omh-apple-design

This is a Hermes-native apple-design workflow skill.

rlaope/oh-my-hermes · 73 tokens

frontend-design-workflow

Workflow for frontend features, visual changes, and product design changes. Present mockup options before writing code, build against the project's design system, capture the right evidence type (screenshots vs video), and run a new-user usability review before finalizing. Use when building or changing UI, styling…

kirodotdev/KiroCrew · 75 tokens