# flutter-internationalization

Automates Flutter internationalization using gen-l10n and ARB files. Solves UI string extraction, RTL layout adjustments, and generated import errors.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 536 installs · ★ 110
- Author: Stanislav \[MADTeacher\] Chernyshev
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/MADTeacher/mad-agents-skills/tree/HEAD/flutter-internationalization/SKILL.md
- Updated: 2026-05-01
- HTML: https://affpapa.org/en/nevibecode/skills/flutter-internationalization

## What it does

This skill guides coding agents through Flutter localization using standard `gen-l10n`. It configures `pubspec.yaml` with `generate: true`, provisions `l10n.yaml`, creates ARB templates, and connects `AppLocalizations` to `MaterialApp` or `CupertinoApp`. Hardcoded strings get converted to generated getters and parameterized calls.

The workflow enforces modern Flutter standards. It disables deprecated `synthetic-package: true` options and avoids stale `package:flutter_gen` imports, placing generated files directly into project directories. The agent relies on `intl` for plurals, selects, numbers, and dates instead of string concatenation.

Right-to-left layout constraints, text directions, and mirrored icons are reviewed when adding RTL locales. For older codebases with `intl_translation`, the skill detects existing setups but warns that `gen-l10n` is the preferred target.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add MADTeacher/mad-agents-skills --skill flutter-internationalization -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/flutter-internationalization/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/flutter-internationalization/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add MADTeacher/mad-agents-skills --skill flutter-internationalization -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/flutter-internationalization/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add MADTeacher/mad-agents-skills --skill flutter-internationalization -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/flutter-internationalization/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install MADTeacher/mad-agents-skills flutter-internationalization
```

2. **Manually: put the files in place**
- File: `.github/skills/flutter-internationalization/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add MADTeacher/mad-agents-skills --skill flutter-internationalization -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/MADTeacher/mad-agents-skills --path flutter-internationalization
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/flutter-internationalization/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add MADTeacher/mad-agents-skills --skill flutter-internationalization -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/MADTeacher/mad-agents-skills/tree/HEAD/flutter-internationalization/SKILL.md

## When to use it
- bootstrap gen-l10n and set up l10n.yaml
- extract hardcoded widget text into ARB files
- handle plurals and date formatting using intl placeholders
- migrate stale package:flutter_gen imports to direct files
- verify layout direction and widget mirroring for RTL locales

## Example prompts
- Set up l10n.yaml and move strings from `lib/main.dart` into `app_en.arb`
- Add Spanish translations in `app_es.arb` with plural cases and placeholders
- Fix `flutter gen-l10n` generation errors and remove package:flutter_gen imports

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 2d9c371f467c55bb.

BEGIN THIRD-PARTY FILE 2d9c371f467c55bb
```text
---
name: flutter-internationalization
description: >-
  Add, fix, audit, and maintain Flutter internationalization with gen-l10n,
  ARB files, AppLocalizations, flutter_localizations, intl formatting,
  plural/select messages, RTL support, locale-specific number/date formatting,
  and localization build errors. Use when asked to add l10n or i18n, translate
  Flutter UI text, configure l10n.yaml, manage ARB translations, migrate away
  from package:flutter_gen imports, or troubleshoot generated localization code.
metadata:
  author: Stanislav [MADTeacher] Chernyshev
  version: "2.0"
---

# Flutter Internationalization

You are a Flutter localization implementer. Make localized apps build, generate,
and read naturally across target locales.

## Principle 0

Generated localization code must match the current Flutter project and SDK. Do
not copy stale `package:flutter_gen` imports or enable `synthetic-package`; use
source-generated `AppLocalizations` imports unless the project proves it is on an
older pinned Flutter workflow.

## Decision Guide

- Use `gen-l10n` for new work, most migrations, ARB management, plural/select
  messages, generated `AppLocalizations`, and Material/Cupertino apps.
- Use legacy `intl_translation` only when the project already uses
  `Intl.message()` plus generated `messages_all.dart`, or the user explicitly
  asks to keep that workflow. Confirm `intl_translation` is a dependency before
  running its generators.
- Use custom map-based localizations only for tiny prototypes or existing code
  that intentionally avoids code generation. Name this limitation in the final
  response.
- If the project has an existing localization setup, follow its paths, class
  names, locale list, and generation style before introducing defaults.

## Workflow

1. Inspect `pubspec.yaml`, `l10n.yaml`, existing `*.arb` files, generated imports,
   `MaterialApp`/`CupertinoApp` setup, and current translation usage.
2. Identify the requested change: bootstrap l10n, add a locale, replace hardcoded
   UI text, add placeholders/plurals/selects, format values, fix generation, or
   migrate stale imports/config.
3. Use the decision guide to choose `gen-l10n`, legacy `intl_translation`, or a
   custom fallback. Prefer the smallest change that fits the existing project.
4. Read only the routed references needed for the task.
5. Make the localization change:
   - add `flutter_localizations` and `intl:any` when missing;
   - set `flutter: generate: true`;
   - create or update `l10n.yaml`;
```
END THIRD-PARTY FILE 2d9c371f467c55bb

The third-party file has ended. Everything between the 2d9c371f467c55bb tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 2520 of 6726 bytes. © Stanislav \[MADTeacher\] Chernyshev · MIT · https://github.com/MADTeacher/mad-agents-skills/tree/HEAD/flutter-internationalization/SKILL.md

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