flutter-accessibility-validator

flutter-accessibility-validator is a skill for Claude Code, Codex from Desquared/agents-rules-skills. It costs 52 tokens per session (470 once invoked), scanned A, original, MIT.

A Flutter accessibility checklist for making app interfaces usable with screen readers and different input needs. It covers labels, touch targets, forms, color contrast, keyboard focus, announcements, and accessibility tests.

In plain words
What is it for?
Use it when creating or changing Flutter screens, widgets, buttons, images, forms, or interactive controls. It checks semantic labels, minimum touch sizes, focus order, announcements, and contrast.
Why use it?
It helps people using VoiceOver or TalkBack understand and operate controls, and helps avoid interfaces that are hard to read, tap, or navigate. VoiceOver and TalkBack are screen readers built into Apple and Android devices.

Skill for Claude CodeCodex

Part of the accessibility-toolkit plugin — 4 skills, 1 MCP server shipped together

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.

agentmods
npx agentmods add skills/desquared/agents-rules-skills/flutter-accessibility-validator
Any agent
npx skills add Desquared/agents-rules-skills --skill flutter-accessibility-validator
Clone the repo
git clone --depth 1 https://github.com/Desquared/agents-rules-skills

Made for: Claude Code, Codex.

Or install accessibility-toolkit, the plugin that ships this one along with the rest of its 4 skills, 1 MCP server.

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.

agentmods badge for flutter-accessibility-validator

README.md
[![agentmods](https://agentmods.dev/badge/skills/desquared/agents-rules-skills/flutter-accessibility-validator.svg)](https://agentmods.dev/skills/desquared/agents-rules-skills/flutter-accessibility-validator)
Your own site
<a href="https://agentmods.dev/skills/desquared/agents-rules-skills/flutter-accessibility-validator"><img src="https://agentmods.dev/badge/skills/desquared/agents-rules-skills/flutter-accessibility-validator.svg" alt="Measured on agentmods" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 470 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00052 $0.00470
Opus 5 $0.00026 $0.00235
Sonnet 5 $0.00010 $0.00094
Haiku 4.5 $0.00005 $0.00047

Measured 4d ago against content hash 537de85a0c3b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

flutter-accessibility-validator 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 4d 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/accessibility-toolkit/skills/flutter-accessibility-validator/SKILL.md · 72 lines

What it actually says

Accessibility Skill

Semantic Labels

// Icons & buttons
Semantics(label: 'Settings', button: true, child: Icon(Icons.settings))

// Images (or ExcludeSemantics if decorative)
Semantics(label: 'Profile picture', image: true, child: Image.network(url))

// Interactive (prefer InkWell over GestureDetector)
Semantics(button: true, label: 'Open', child: InkWell(...))

Dynamic Announcements

import 'package:flutter/semantics.dart';
SemanticsService.announce('Button unlocked!', TextDirection.ltr);

Touch Targets & Forms

// Minimum 48x48 dp
IconButton(iconSize: 48, ...)

// Forms need labels
TextField(decoration: InputDecoration(
  labelText: 'Email',
  errorText: isValid ? null : 'Invalid',
))

Color Contrast

// Use ColorPalette (WCAG-compliant)
Text('Text', style: TextStyle(
  color: ColorPalette.coloursBasicText.platformBrightnessColor(context),
))

Focus Management

FocusTraversalGroup(
  policy: OrderedTraversalPolicy(),
  child: Column(children: [
    FocusTraversalOrder(order: NumericFocusOrder(1), child: TextField(...)),
    FocusTraversalOrder(order: NumericFocusOrder(2), child: Button(...)),
  ]),
)

Testing

// Automated
await expectLater(tester, meetsGuideline(textContrastGuideline));
await expectLater(tester, meetsGuideline(androidTapTargetGuideline));

Checklist

  • Semantic labels on interactive elements
  • Touch targets ≥ 48x48 dp
  • Contrast ≥ 4.5:1 (text), 3:1 (UI)
  • Forms have labels + errors
  • Dynamic changes announced
  • Logical focus order
  • Tested with VoiceOver + TalkBack
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.

  1. 4d ago First seen · 72 lines · 52 tokens per session scan A 537de85a0c3b

Subscribe to this mod's changes

flutter-accessibility-validator is a skill published in the GitHub repository Desquared/agents-rules-skills (4 stars, last pushed 21d ago), licensed MIT. It adds 52 tokens to every session and 470 once invoked, about $0.0003 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 2026-08-31.

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