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.
npx skills add sgaabdu4/building-flutter-apps --skill codebase-designgit clone --depth 1 https://github.com/sgaabdu4/building-flutter-appsWrote 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.
[](https://agentmods.dev/skills/sgaabdu4/building-flutter-apps/codebase-design)<a href="https://agentmods.dev/skills/sgaabdu4/building-flutter-apps/codebase-design"><img src="https://agentmods.dev/badge/skills/sgaabdu4/building-flutter-apps/codebase-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.
<a href="https://agentmods.dev/skills/sgaabdu4/building-flutter-apps/codebase-design"><img src="https://agentmods.dev/badge/skills/sgaabdu4/building-flutter-apps/codebase-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00045 | $0.00143 |
| Opus 5.5 | $0.00018 | $0.00057 |
| Sonnet 5.5 | $0.00009 | $0.00029 |
| Haiku 4.5 | $0.00005 | $0.00014 |
Grade A, and why
codebase-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 22d 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.
What it actually says
Codebase Design
Load the shared structure reference + matching conditional references.
flowchart LR
S[references/structure.md] -->|UI tokens / components / composition| U[references/ui.md]
S -->|Domain model / business rules / context boundaries| D[references/domain.md]
click S "references/structure.md"
click U "references/ui.md"
click D "references/domain.md"
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.
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.
- 22d ago First seen · 18 lines · 45 tokens per session scan A 120ecf7a59a2
codebase-design is a skill published in the GitHub repository sgaabdu4/building-flutter-apps (25 stars, last pushed 4d ago), licensed MIT. It adds 45 tokens to every session and 143 once invoked, about $0.0002 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 2026-09-29.
Other skills, from other repositories
fl-ui-components
Awareness index of every reusable widget in flui, fltheme, flmedia, and core's commonwidget — name, one-line purpose, when to reach for it instead of writing a new one.
fl-theme-usage
Applies the fltheme design system via context.themeColor and context.textTheme without hard-coded colors or Material text-style names.
accessibility
Use when working on accessibility, a11y, WCAG, ARIA, screen readers, keyboard nav, focus order, contrast, alt text, captions, reduced motion, or target sizes; not language/culture/device (see inclusive-design).
inclusive-design
Use when working on inclusion, i18n/localization, global name/address forms, low-end devices, slow/metered networks, affordability, or first-time/low-confidence users; not WCAG/screen readers (see accessibility).
building-shadcn-flutter-ui
Build beautiful, accessible, and highly customizable user interfaces in Flutter using the Shadcn UI design system. This skill ensures proper framework integration (Pure, Material, or Cupertino), consistent theming, and effective use of the 30+ responsive components available in the library.
flutter
Flutter 3.44 — widget catalog, layouts, interactivity, animations, navigation, assets, adaptive/responsive design, accessibility, i18n, state management, data & backend (networking, serialization, Firebase, persistence), app architecture (MVVM, DI), platform integration (Android, iOS, web, Windows, macOS, Linux…