Flutter Bloc and Cubit
andrewyng/context-hub
Helps choose between Bloc and Cubit in Flutter and sets defaults for packages, lifecycle, widget binding and tests.
A skill your agent uses when building cross-platform applications with Flutter 3+ and Dart.
Install Flutter Expert
$ npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install FNOSP/FlyNarwhal flutter-expert --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/FNOSP/FlyNarwhal.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/flutter-expert .claude/skills/flutter-expert && rm -rf skills-srcUse ~/.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/
Install the "flutter-expert" agent skill from https://github.com/FNOSP/FlyNarwhal/tree/master/.agents/skills/flutter-expert into .claude/skills/flutter-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-expert", 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 install https://github.com/FNOSP/FlyNarwhal/tree/master/.agents/skills/flutter-expertType 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.
$ npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install FNOSP/FlyNarwhal flutter-expert --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/FNOSP/FlyNarwhal.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/flutter-expert .agents/skills/flutter-expert && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "flutter-expert" agent skill from https://github.com/FNOSP/FlyNarwhal/tree/master/.agents/skills/flutter-expert into .agents/skills/flutter-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-expert", 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.
$ npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install FNOSP/FlyNarwhal flutter-expert --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/FNOSP/FlyNarwhal.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/flutter-expert .cursor/skills/flutter-expert && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "flutter-expert" agent skill from https://github.com/FNOSP/FlyNarwhal/tree/master/.agents/skills/flutter-expert into .cursor/skills/flutter-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-expert", 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 https://github.com/FNOSP/FlyNarwhal.git --path .agents/skills/flutter-expert--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install FNOSP/FlyNarwhal flutter-expert --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/FNOSP/FlyNarwhal.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/flutter-expert .gemini/skills/flutter-expert && rm -rf skills-srcUse ~/.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/
Install the "flutter-expert" agent skill from https://github.com/FNOSP/FlyNarwhal/tree/master/.agents/skills/flutter-expert into .gemini/skills/flutter-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-expert", 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.
$ gh skill install FNOSP/FlyNarwhal flutter-expertInstalls 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).
$ npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/FNOSP/FlyNarwhal.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/flutter-expert .github/skills/flutter-expert && rm -rf skills-srcUse ~/.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/
Install the "flutter-expert" agent skill from https://github.com/FNOSP/FlyNarwhal/tree/master/.agents/skills/flutter-expert into .github/skills/flutter-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-expert", 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.
$ npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install FNOSP/FlyNarwhal flutter-expert --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/FNOSP/FlyNarwhal.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/flutter-expert .opencode/skills/flutter-expert && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "flutter-expert" agent skill from https://github.com/FNOSP/FlyNarwhal/tree/master/.agents/skills/flutter-expert into .opencode/skills/flutter-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-expert", 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-expert- GitHub stars
- 495
- Used in
- 2 other repos
- Token cost
- ~758 tokens
- SKILL.md length
- 275 words
- Files
- 7 (incl. references)
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when building cross-platform applications with Flutter 3+ and Dart.
- Works in 5 steps: Setup - Project structure, dependencies,… → State - Riverpod providers or Bloc setup → Widgets - Reusable, const-optimized… → …
- Building cross-platform applications with Flutter 3+ and Dart
- SKILL.md covers Role Definition, When to Use This Skill, Core Workflow and Reference Guide, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Flutter Expert is an agent skill from FNOSP/FlyNarwhal. Use when building cross-platform applications with Flutter 3+ and Dart. Invoke for widget development, Riverpod/Bloc state management, GoRouter navigation, platform-specific implementations, performance optimization.
Its SKILL.md is about 760 tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files (for example `references/bloc-state.md`, `references/gorouter-navigation.md` and `references/performance.md`).
It sits in Mobile, covering Cross-platform mobile apps and State management. It works with Flutter and Dart. The repository describes itself as: 基于 Flutter 框架开发的适用于飞牛影视的跨平台客户端. The licence is MIT.
When your agent uses it
- Building cross-platform applications with Flutter 3+ and Dart
- Tasks that involve Cross-platform mobile apps
- Tasks that involve State management
Example prompts
- “/flutter-expert”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Setup - Project structure, dependencies, routing
- State - Riverpod providers or Bloc setup
- Widgets - Reusable, const-optimized components
- Test - Widget tests, integration tests
- Optimize - Profile, reduce rebuilds
What it can do on your machine
Read from SKILL.md and the folder at commit c94d847. 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
No scripts in the folder and no shell commands in SKILL.md.
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 Expert loads about 758 tokens when it runs, and up to ~5.2k if it reads all its reference files. Until then it costs about 58 tokens; SKILL.md has 275 words of instructions outside code blocks.
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 FNOSP/FlyNarwhal at commit c94d847, republished under its MIT licence (© FNOSP). 275 words, ~758 tokens.
Download SKILL.mdSave it as
.claude/skills/flutter-expert/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.- name
- flutter-expert
- description
- Use when building cross-platform applications with Flutter 3+ and Dart. Invoke for widget development, Riverpod/Bloc state management, GoRouter navigation, platform-specific implementations, performance optimization.
- license
- MIT
- metadata.author
- https://github.com/Jeffallan
- metadata.version
- 1.0.0
- metadata.domain
- frontend
- metadata.triggers
- Flutter, Dart, widget, Riverpod, Bloc, GoRouter, cross-platform
- metadata.role
- specialist
- metadata.scope
- implementation
- metadata.output-format
- code
- metadata.related-skills
- react-native-expert, test-master, fullstack-guardian
Flutter Expert
Senior mobile engineer building high-performance cross-platform applications with Flutter 3 and Dart.
Role Definition
You are a senior Flutter developer with 6+ years of experience. You specialize in Flutter 3.19+, Riverpod 2.0, GoRouter, and building apps for iOS, Android, Web, and Desktop. You write performant, maintainable Dart code with proper state management.
When to Use This Skill
- Building cross-platform Flutter applications
- Implementing state management (Riverpod, Bloc)
- Setting up navigation with GoRouter
- Creating custom widgets and animations
- Optimizing Flutter performance
- Platform-specific implementations
Core Workflow
- Setup - Project structure, dependencies, routing
- State - Riverpod providers or Bloc setup
- Widgets - Reusable, const-optimized components
- Test - Widget tests, integration tests
- Optimize - Profile, reduce rebuilds
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Riverpod | references/riverpod-state.md | State management, providers, notifiers |
| Bloc | references/bloc-state.md | Bloc, Cubit, event-driven state, complex business logic |
| GoRouter | references/gorouter-navigation.md | Navigation, routing, deep linking |
| Widgets | references/widget-patterns.md | Building UI components, const optimization |
| Structure | references/project-structure.md | Setting up project, architecture |
| Performance | references/performance.md | Optimization, profiling, jank fixes |
Constraints
MUST DO
- Use const constructors wherever possible
- Implement proper keys for lists
- Use Consumer/ConsumerWidget for state (not StatefulWidget)
- Follow Material/Cupertino design guidelines
- Profile with DevTools, fix jank
- Test widgets with flutter_test
MUST NOT DO
- Build widgets inside build() method
- Mutate state directly (always create new instances)
- Use setState for app-wide state
- Skip const on static widgets
- Ignore platform-specific behavior
- Block UI thread with heavy computation (use compute())
Output Templates
When implementing Flutter features, provide:
- Widget code with proper const usage
- Provider/Bloc definitions
- Route configuration if needed
- Test file structure
Knowledge Reference
Flutter 3.19+, Dart 3.3+, Riverpod 2.0, Bloc 8.x, GoRouter, freezed, json_serializable, Dio, flutter_hooks
© FNOSP, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 6 other files (references) in .agents/skills/flutter-expert of FNOSP/FlyNarwhal.
- SKILL.md
- references/bloc-state.md
- references/gorouter-navigation.md
- references/performance.md
- references/project-structure.md
- references/riverpod-state.md
- references/widget-patterns.md
Open the folder on GitHubat commit c94d847
Used in 2 other repositories
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in FNOSP/FlyNarwhal, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Flutter Expert 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Flutter Expert this skillFNOSP/FlyNarwhal | 495 | 2 repos | ~758 | Automated safety check: Pass | MIT | |
| Flutter Bloc and Cubitandrewyng/context-hub | 14k | — | ~998 | Automated safety check: Pass | MIT | |
| Flutter Riverpod State Managementandrewyng/context-hub | 14k | — | ~1.1k | Automated safety check: Pass | MIT | |
| BlocVeryGoodOpenSource/vgv-ai-flutter-plugin | 169 | — | ~2k | Automated safety check: Pass | MIT | |
| Flutter Dart Code Reviewaffaan-m/ECC | 274k | 2 repos | ~5.8k | Automated safety check: Notes | MIT | |
| Signals for Flutterrodydavis/signals.dart | 819 | — | ~1.9k | Automated safety check: Pass | Apache-2.0 |
Similar skills
Flutter Riverpod State Management
andrewyng/context-hub
Guides Flutter state management with Riverpod: choosing provider types, wiring ConsumerWidgets, handling async state and lifecycle, and overriding providers in tests.
Bloc
VeryGoodOpenSource/vgv-ai-flutter-plugin
Best practices for Bloc state management in Flutter/Dart, covering Cubit versus Bloc, event and state naming, sealed classes with Equatable, the Page/View split with BlocProvider, BlocBuilder…
Flutter Dart Code Review
affaan-m/ECC
Library-agnostic Flutter/Dart code review checklist covering widget best practices, state management patterns (BLoC, Riverpod, Provider, GetX, MobX, Signals), Dart idioms, performance…
Signals for Flutter
rodydavis/signals.dart
Reference for the signals_flutter package: reactive signals, computed values, effects, async signals and collection signals bound to Flutter widgets.
Signals Core Advanced Primitives
rodydavis/signals.dart
Reference for the advanced parts of Dart's signals_core: reactive primitives, async signals, reactive collections and utility types, with a linked page for each.
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Categories
Questions about Flutter Expert
What does Flutter Expert do?
A skill your agent uses when building cross-platform applications with Flutter 3+ and Dart. Flutter Expert is an agent skill from FNOSP/FlyNarwhal. Use when building cross-platform applications with Flutter 3+ and Dart.
When should I use Flutter Expert?
Flutter Expert fits situations like: building cross-platform applications with Flutter 3+ and Dart; tasks that involve Cross-platform mobile apps; tasks that involve State management.
How do I install Flutter Expert in Claude Code?
Run `npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a claude-code`. Or copy the skill folder (.agents/skills/flutter-expert in FNOSP/FlyNarwhal) into .claude/skills/flutter-expert in your project. Claude Code loads it when a task matches its description.
How do I install Flutter Expert in Codex?
Run `npx skills add FNOSP/FlyNarwhal --skill flutter-expert -a codex`. Or copy the skill folder (.agents/skills/flutter-expert in FNOSP/FlyNarwhal) into .agents/skills/flutter-expert in your project. Codex loads it when a task matches its description.
Can I use Flutter Expert 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 FNOSP/FlyNarwhal --skill flutter-expert -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-expert, .gemini/skills/flutter-expert, .github/skills/flutter-expert and .opencode/skills/flutter-expert in your project.
What does Flutter Expert need to run?
SKILL.md names no scripts, command-line tools or credentials: Flutter Expert is instructions for the agent only.
Does Flutter Expert 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 Expert 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 Expert use?
Flutter Expert is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Flutter Expert use?
About 758 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.5k tokens, read only when the agent opens those files.
What are the alternatives to Flutter Expert?
Skills that share tags, products or a category with Flutter Expert: Flutter Bloc and Cubit (andrewyng/context-hub, 14k stars), Flutter Riverpod State Management (andrewyng/context-hub, 14k stars), Bloc (VeryGoodOpenSource/vgv-ai-flutter-plugin, 169 stars) and Flutter Dart Code Review (affaan-m/ECC, 274k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Flutter Expert?
FNOSP (a GitHub organization) maintains it in FNOSP/FlyNarwhal, which has 495 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on October 6, 2026.
Source: FNOSP/FlyNarwhal on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.