What is flutter-widget-architecture?

A guide to structuring Flutter screens as small, reusable widgets. Widgets are Flutter's building blocks for describing what appears on screen; the guide keeps business rules and data work outside those visual pieces.

Use it when building Flutter screens, splitting complex layouts into components, managing local versus app-wide state, and applying shared theme values.

Large widgets that mix layout, network calls, and business rules are difficult to test and change. Separating these concerns also helps avoid unnecessary redraws and hardcoded styles.

flutter-widget-architecture — Skill by makifbaysal/tasktrooper

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 makifbaysal/tasktrooper --skill flutter-widget-architecture

Clone the repo

git clone --depth 1 https://github.com/makifbaysal/tasktrooper

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/makifbaysal/tasktrooper/flutter-widget-architecture/github.svg)](https://agentmods.dev/skills/makifbaysal/tasktrooper/flutter-widget-architecture)

Your own site

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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/makifbaysal/tasktrooper/flutter-widget-architecture"><img src="https://agentmods.dev/badge/skills/makifbaysal/tasktrooper/flutter-widget-architecture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,263 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 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	$0.00046	$0.01263
Opus 5.5	$0.00018	$0.00505
Sonnet 5.5	$0.00009	$0.00253
Haiku 4.5	$0.00005	$0.00126

Measured 8d ago against content hash ffc9a9ec17a2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

flutter-widget-architecture 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.

catalog/agents/mobile-developer/skills/flutter-widget-architecture/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Overview

Flutter UI is a tree of widgets. The quality difference is in decomposition: small, focused, mostly-stateless widgets that read like the UI they render, with business logic pushed out of the widget tree.

Core principle: Widgets describe what the UI looks like given state. They do not fetch data, hold business rules, or talk to the network — that lives in state/services (see flutter-state-management).

Rules

Prefer StatelessWidget. Reach for StatefulWidget only for truly local, ephemeral UI state (an animation controller, a text field's focus). App/business state lives in your state management layer.
Small widgets over deep build methods. A build longer than ~40 lines or nested 5+ deep is a set of extract-widget opportunities. Extract named widgets, not Widget _buildX() helper methods (named widgets get their own rebuild scope and are testable).
const constructors everywhere possible — a const widget subtree is skipped on rebuild. This is the cheapest performance win in Flutter.
Theme, not hardcoded styles. Colors, text styles, spacing come from Theme.of(context) / a design-token file (context.space, see mobile-design-system-foundation) — never scattered Color(0xFF...) and magic paddings. This is the Flutter equivalent of "no custom CSS."
Keys only when you need identity across rebuilds (reorderable lists) — don't sprinkle them.
Decide layout by available width, not device type or orientation. Use LayoutBuilder or MediaQuery.sizeOf(context) — never MediaQuery.of(context).size (that rebuilds on every metric change, not just size) and never a device-type/orientation check to pick a layout. See adaptive-layout and mobile-visual-self-review for the size matrix this must hold at.
Color.withValues(alpha:), not the deprecated withOpacity (precision loss). TextScaler (MediaQuery.textScalerOf(context).scale(...)), not the deprecated textScaleFactor.

Read the full file on GitHub · 81 lines

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 · 81 lines · 46 tokens per session scan A ffc9a9ec17a2

Subscribe to this mod's changes

flutter-widget-architecture is a skill published in the GitHub repository makifbaysal/tasktrooper (113 stars, last pushed yesterday), licensed Apache-2.0. It adds 46 tokens to every session and 1,263 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 2026-10-05.

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architecture-design

Use this skill to design system architecture with documented trade-offs and decisions before any implementation begins. Activates when a feature, system, or component requires non-trivial structural decisions about how components interact, what data stores to use, or how to decompose a problem.

karthikrshet/aiskills · 60 tokens

repository-discovery

Use this skill to systematically explore an unfamiliar codebase before making any changes. Activates when starting work in an unknown repository, adding a new feature, debugging without prior context, or when no CONTEXT.md exists. Produces a grounded understanding of architecture, conventions, and constraints.