Agent skill

Flutter Localizing Apps

Configures a Flutter app to support multiple languages and regions.

BSD-3-ClauseAuto-check passedMobile

Install Flutter Localizing Apps

skills CLI

$ npx skills add btwld/superdeck --skill flutter-localizing-apps -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install btwld/superdeck flutter-localizing-apps --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/flutter-localizing-apps .claude/skills/flutter-localizing-apps && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "flutter-localizing-apps" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-localizing-apps into .claude/skills/flutter-localizing-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-localizing-apps", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-localizing-apps

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add btwld/superdeck --skill flutter-localizing-apps -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install btwld/superdeck flutter-localizing-apps --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/flutter-localizing-apps .agents/skills/flutter-localizing-apps && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "flutter-localizing-apps" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-localizing-apps into .agents/skills/flutter-localizing-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-localizing-apps", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add btwld/superdeck --skill flutter-localizing-apps -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install btwld/superdeck flutter-localizing-apps --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/flutter-localizing-apps .cursor/skills/flutter-localizing-apps && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "flutter-localizing-apps" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-localizing-apps into .cursor/skills/flutter-localizing-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-localizing-apps", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/btwld/superdeck.git --path .agents/skills/flutter-localizing-apps

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add btwld/superdeck --skill flutter-localizing-apps -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install btwld/superdeck flutter-localizing-apps --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/flutter-localizing-apps .gemini/skills/flutter-localizing-apps && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "flutter-localizing-apps" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-localizing-apps into .gemini/skills/flutter-localizing-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-localizing-apps", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install btwld/superdeck flutter-localizing-apps

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add btwld/superdeck --skill flutter-localizing-apps -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/flutter-localizing-apps .github/skills/flutter-localizing-apps && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "flutter-localizing-apps" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-localizing-apps into .github/skills/flutter-localizing-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-localizing-apps", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add btwld/superdeck --skill flutter-localizing-apps -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install btwld/superdeck flutter-localizing-apps --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/flutter-localizing-apps .opencode/skills/flutter-localizing-apps && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "flutter-localizing-apps" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-localizing-apps into .opencode/skills/flutter-localizing-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-localizing-apps", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: flutter-localizing-apps
GitHub stars: 130
Token cost: ~1.5k tokens
SKILL.md length: 369 words
Files: 1
Skills in repo: 23
Repo updated: Sep 28, 2026
First seen: Oct 7, 2026
Licence: BSD-3-Clause

At a glance

Configures a Flutter app to support multiple languages and regions.

Works in 2 steps: Add required dependencies to pubspec.yaml → Create an l10n.yaml file in the project…
Preparing an application for international markets and diverse user locales
SKILL.md covers Contents, Core Configuration, Defining ARB Resources and App Integration, plus 3 more sections
Calls flutter

What it does

Flutter Localizing Apps is an agent skill from btwld/superdeck. Configures a Flutter app to support multiple languages and regions. Use when preparing an application for international markets and diverse user locales.

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Mobile, covering Cross-platform mobile apps and Internationalization. It works with Flutter and iOS. The repository describes itself as: Presentation slides for Flutter with Flutter. The licence is BSD-3-Clause.

When your agent uses it

Preparing an application for international markets and diverse user locales
Tasks that involve Cross-platform mobile apps
Tasks that involve Internationalization

Example prompts

“Use the flutter-localizing-apps skill to configure a Flutter app to support multiple languages and regions”
“/flutter-localizing-apps”

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

Add required dependencies to pubspec.yaml
Create an l10n.yaml file in the project root to configure the gen-l10n tool

What it can do on your machine

Read from SKILL.md and the folder at commit 815a746. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- flutter
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Flutter Localizing Apps loads about 1.5k tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 369 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~44
When it runs · the whole SKILL.md, loaded when a task matches: ~1.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from btwld/superdeck at commit 815a746, republished under its BSD-3-Clause licence (© btwld). 369 words, ~1,493 tokens.

Download SKILL.mdSave it as .claude/skills/flutter-localizing-apps/SKILL.md (or your agent's skills folder).

name: flutter-localizing-apps
description: Configures a Flutter app to support multiple languages and regions. Use when preparing an application for international markets and diverse user locales.
metadata.model: models/gemini-3.1-pro-preview
metadata.last_modified: Thu, 12 Mar 2026 22:17:07 GMT

Core Configuration

Configure the project to support code generation for localizations.

Add required dependencies to pubspec.yaml:

yaml

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter
  intl: any

flutter:
  generate: true # Required for l10n code generation

Create an l10n.yaml file in the project root to configure the gen-l10n tool:

yaml

arb-dir: lib/l10n
template-arb-file: app_en.arb
output-localization-file: app_localizations.dart
# Optional: Set to false to generate files into lib/ instead of the synthetic package
# synthetic-package: false

Defining ARB Resources

Store localized strings in Application Resource Bundle (.arb) files within the configured arb-dir.

Create the template file (e.g., lib/l10n/app_en.arb):

json

{
  "helloWorld": "Hello World!",
  "@helloWorld": {
    "description": "The conventional newborn programmer greeting"
  }
}

Create translation files (e.g., lib/l10n/app_es.arb):

json

{
  "helloWorld": "¡Hola Mundo!"
}

App Integration

Initialize the Localizations widget by configuring the root MaterialApp or CupertinoApp.

dart

import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart'; // Adjust import if synthetic-package is false

return MaterialApp(
  title: 'Localized App',
  localizationsDelegates: const [
    AppLocalizations.delegate,
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
    GlobalCupertinoLocalizations.delegate,
  ],
  supportedLocales: const [
    Locale('en'), // English
    Locale('es'), // Spanish
  ],
  home: const MyHomePage(),
);

Access localized values in the widget tree using the generated AppLocalizations class:

dart

Text(AppLocalizations.of(context)!.helloWorld)

Note: If using WidgetsApp instead of MaterialApp, omit GlobalMaterialLocalizations.delegate.

Advanced Formatting

Use placeholders, plurals, and selects for dynamic content. Define parameters in the @key metadata.

Placeholders

json

"hello": "Hello {userName}",
"@hello": {
  "description": "A message with a single parameter",
  "placeholders": {
    "userName": {
      "type": "String",
      "example": "Bob"
    }
  }
}

Plurals

json

"nWombats": "{count, plural, =0{no wombats} =1{1 wombat} other{{count} wombats}}",
"@nWombats": {
  "placeholders": {
    "count": {
      "type": "num",
      "format": "compact"
    }
  }
}

Selects (Gender/Enums)

json

"pronoun": "{gender, select, male{he} female{she} other{they}}",
"@pronoun": {
  "placeholders": {
    "gender": {
      "type": "String"
    }
  }
}

Dates and Numbers

Use format and optionalParameters to leverage intl formatting.

json

"dateMessage": "Date: {date}",
"@dateMessage": {
  "placeholders": {
    "date": {
      "type": "DateTime",
      "format": "yMd"
    }
  }
}

Workflows

Task Progress: Adding a New Language

Copy this checklist to track progress when introducing a new locale.

Create a new .arb file in the arb-dir (e.g., app_fr.arb).
Translate all keys present in the template .arb file.
Add the new Locale to the supportedLocales list in MaterialApp.
Run validator -> Execute flutter gen-l10n to verify ARB syntax and regenerate AppLocalizations.
Review errors -> Fix any missing placeholders or malformed plural/select statements.
If targeting iOS, complete the "Configuring iOS App Bundle" workflow.

Show full SKILL.md (151 more words)Show less

Task Progress: Configuring iOS App Bundle

Flutter handles runtime localization, but iOS requires bundle-level configuration for the App Store and system settings.

Open ios/Runner.xcodeproj in Xcode.
Select the Runner project in the Project Navigator.
Navigate to the Info tab.
Under the Localizations section, click the + button.
Add the newly supported languages/regions.
Run validator -> Build the iOS app to ensure project.pbxproj is correctly updated.

Troubleshooting & Gotchas

Missing Localizations Ancestor

Widgets like TextField and CupertinoTabBar require a Localizations ancestor with specific delegates (MaterialLocalizations or CupertinoLocalizations).

Error: No MaterialLocalizations found. or CupertinoTabBar requires a Localizations parent... Fix: Ensure the widget is a descendant of MaterialApp/CupertinoApp. If building a standalone widget tree (e.g., in tests or a custom WidgetsApp), wrap the widget in a Localizations widget:

dart

Localizations(
  locale: const Locale('en', 'US'),
  delegates: const [
    DefaultWidgetsLocalizations.delegate,
    DefaultMaterialLocalizations.delegate, // Required for TextField
    DefaultCupertinoLocalizations.delegate, // Required for CupertinoTabBar
  ],
  child: child,
)

Advanced Locale Definition

If supporting languages with multiple scripts (e.g., Chinese), use Locale.fromSubtags to explicitly define the scriptCode and countryCode to prevent Flutter from resolving to an unexpected variant.

dart

supportedLocales: const [
  Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),
  Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'TW'),
]

Files

Just SKILL.md in .agents/skills/flutter-localizing-apps of btwld/superdeck.

Open the folder on GitHubat commit 815a746

Compare with similar skills

Flutter Localizing Apps next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Flutter Localizing Apps compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Flutter Localizing Apps this skillbtwld/superdeck	130	—	~1.5k	Automated safety check: Pass	BSD-3-Clause	10 days ago
Engine Whats Newflutter/flutter	179k	—	~978	Automated safety check: Pass	BSD-3-Clause	today
Run Devicelab With Ledflutter/flutter	179k	—	~786	Automated safety check: Pass	BSD-3-Clause	today
Apple Designvrcm-team/VRCM	179	1 repos	~6.2k	Automated safety check: Pass	MIT	7 days ago
Add Flutter Docusaurus Localematthiasn/lotti	1.2k	—	~1.2k	Automated safety check: Pass	GPL-3.0	today
Liquid Glass Widgetssdegenaar/liquid_glass_widgets	712	—	~3.8k	Automated safety check: Pass	MIT	today

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Questions about Flutter Localizing Apps

What does Flutter Localizing Apps do?

Configures a Flutter app to support multiple languages and regions. Flutter Localizing Apps is an agent skill from btwld/superdeck. Configures a Flutter app to support multiple languages and regions.

When should I use Flutter Localizing Apps?

Flutter Localizing Apps fits situations like: preparing an application for international markets and diverse user locales; tasks that involve Cross-platform mobile apps; tasks that involve Internationalization.

How do I install Flutter Localizing Apps in Claude Code?

Run `npx skills add btwld/superdeck --skill flutter-localizing-apps -a claude-code`. Or copy the skill folder (.agents/skills/flutter-localizing-apps in btwld/superdeck) into .claude/skills/flutter-localizing-apps in your project. Claude Code loads it when a task matches its description.

How do I install Flutter Localizing Apps in Codex?

Run `npx skills add btwld/superdeck --skill flutter-localizing-apps -a codex`. Or copy the skill folder (.agents/skills/flutter-localizing-apps in btwld/superdeck) into .agents/skills/flutter-localizing-apps in your project. Codex loads it when a task matches its description.

Can I use Flutter Localizing Apps in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add btwld/superdeck --skill flutter-localizing-apps -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/flutter-localizing-apps, .gemini/skills/flutter-localizing-apps, .github/skills/flutter-localizing-apps and .opencode/skills/flutter-localizing-apps in your project.

What does Flutter Localizing Apps need to run?

Going by SKILL.md and its folder, Flutter Localizing Apps needs the command-line tools its instructions call (flutter).

Does Flutter Localizing Apps access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Flutter Localizing Apps safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Flutter Localizing Apps use?

Flutter Localizing Apps is published under the BSD-3-Clause licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Flutter Localizing Apps use?

About 1.5k tokens (SKILL.md is roughly 6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Flutter Localizing Apps?

Skills that share tags, products or a category with Flutter Localizing Apps: Engine Whats New (flutter/flutter, 179k stars), Run Devicelab With Led (flutter/flutter, 179k stars), Apple Design (vrcm-team/VRCM, 179 stars) and Add Flutter Docusaurus Locale (matthiasn/lotti, 1.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Flutter Localizing Apps?

btwld (a GitHub organization) maintains it in btwld/superdeck, which has 130 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on September 28, 2026.

Source: btwld/superdeck on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Flutter Localizing Apps

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Localizing Flutter Applications

Contents

Core Configuration

Defining ARB Resources

App Integration

Advanced Formatting

Placeholders

Plurals

Selects (Gender/Enums)

Dates and Numbers

Workflows

Task Progress: Adding a New Language

Task Progress: Configuring iOS App Bundle

Troubleshooting & Gotchas

Missing Localizations Ancestor

Advanced Locale Definition

Files

Compare with similar skills

Similar skills

More from btwld/superdeck

Related

Questions about Flutter Localizing Apps