Flutter AI Skills for Claude Code, Codex, Cursor, Antigravity, and Other AI Coding Agents

36 Flutter and Dart skills your coding agent loads by itself, sourced only from official documentation.

A skill is a folder with a SKILL.md file. Your agent reads the description, decides a task matches, and pulls in the guidance — you don't paste anything into a rules file or remember to @-mention a doc. Install once, and Firebase Auth guidance shows up when you touch auth, Riverpod guidance when you touch providers.

A comprehensive, (almost) non-opinionated collection: everything here is derived from official Flutter, Dart, Firebase, and package documentation. No personal preferences, no invented conventions.

⚡ Quick start

npx skills add evanca/flutter-ai-rules

That's it. The Skills CLI discovers the packages under skills/ and installs them for supported agents. It needs Node 22.20 or newer — on older versions it exits with SyntaxError: ... does not provide an export named 'styleText' before it does anything. Every other install route below works on any Node version, or none at all.

Browse before installing, or take just one:

npx skills add evanca/flutter-ai-rules --list
npx skills add evanca/flutter-ai-rules --skill flutter-best-practices

Install as a plugin

This repo is also a plugin marketplace, so agents that support plugins can install the whole set and keep it updated in place. The manifests live at .claude-plugin/, .codex-plugin/, .cursor-plugin/, .agents/plugins/, and plugin.json — all pointing at the same skills/ directory.

Claude Code — plugin marketplaces:

/plugin marketplace add evanca/flutter-ai-rules
/plugin install flutter-ai-skills@flutter-ai-rules

Skills then load as flutter-ai-skills:bloc, flutter-ai-skills:riverpod, and so on.

Codex — plugins:

codex plugin marketplace add evanca/flutter-ai-rules
codex plugin install flutter-ai-skills@flutter-ai-rules

Cursor — plugins: in Cursor, run /add-plugin, or add the repo as a team marketplace under Dashboard → Settings → Plugins → Import from Repo:

https://github.com/evanca/flutter-ai-rules

Antigravity — plugins:

git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git
agy plugin install ./flutter-ai-rules

Windsurf / Devin has no plugin manifest, but Cascade already scans .agents/skills/ and ~/.agents/skills/, so the manual copy below is the install path. GitHub Copilot doesn't read SKILL.md at all — see Rules and combined sets for what to use instead.

Prefer to do it by hand? Copy or symlink any skill folder into your agent's skills directory — .claude/skills/, .cursor/skills/, .codex/skills/, .agents/skills/ (Antigravity, Codex, Windsurf), .windsurf/skills/. Or vendor the whole set into your project:

git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git temp_repo && mkdir -p .skills && cp -r temp_repo/skills/* .skills && rm -rf temp_repo

With a .skills/ folder you can also reference a skill explicitly when you want it: "Read @.skills/bloc/SKILL.md and create test coverage for the new methods."

🧠 What's in the box

Flutter and Dart foundations

Skill	Loads when you're…
flutter-best-practices	Writing, reviewing, or planning Flutter code
effective-dart	Writing Dart, naming things, adding doc comments
dart-3-updates	Using records, patterns, sealed classes, switch expressions
flutter-app-architecture	Scaffolding a project or refactoring into layers
architecture-feature-first	Designing folder structure for a new feature
flutter-errors	Hitting RenderFlex overflows, unbounded constraints, layout errors
flutter-use-column-row-first	Building responsive layouts with Row, Column, Expanded, Flexible
flutter-pre-caching	Preloading fonts, images, animations, or config

State management

Skill	Loads when you're…
bloc	Creating a Cubit or Bloc, modeling state, wiring providers
riverpod	Setting up providers, combining requests, managing disposal
provider	Consuming state, optimizing rebuilds, using ProxyProvider
flutter-change-notifier	Setting up ChangeNotifier models and consuming them

Testing and review

Skill	Loads when you're…
testing	Writing unit, widget, or golden tests; fixing flaky tests
mockito	Generating mocks, stubbing, verifying interactions
mocktail	Mocking without codegen, registering fallback values
patrol-e2e-testing	Writing E2E tests that touch native permissions or dialogs
code-review	Reviewing a PR, branch, or diff

Firebase

Skill	Loads when you're…
flutterfire-configure	Adding Firebase to a project, running flutterfire configure
firebase-auth	Setting up auth, managing auth state, social sign-in
firebase-cloud-firestore	Designing schemas, CRUD, listeners, pagination
firebase-database	Syncing real-time data, structuring JSON trees
firebase-storage	Uploading and downloading files, managing metadata
firebase-analytics	Logging events, setting user properties
firebase-crashlytics	Capturing fatal and non-fatal errors
firebase-messaging	Setting up FCM, handling background messages
firebase-in-app-messaging	Running in-app campaigns
firebase-remote-config	Implementing feature flags or A/B tests
firebase-app-check	Configuring attestation and debug tokens
firebase-cloud-functions	Calling callable functions, handling errors
firebase-ai	Generating text or chat with Gemini via firebase_ai
generate-images-with-firebase-ai	Generating or editing images with a Gemini image model (Nano Banana)
firebase-data-connect	Writing GraphQL queries against Data Connect

Shipping and product

Skill	Loads when you're…
accessibility	Working on a11y, WCAG, screen readers, focus order
inclusive-design	Handling i18n, global name/address forms, low-end devices
store-listing-assets	Writing store copy to character limits
revenuecat-testing	Testing purchases, subscriptions, sandbox flows
developing-genkit-dart	Building AI agents in Dart with Genkit

🗂️ Rules and combined sets (legacy)

Before skills existed, this repo shipped rule files you pasted into a config, plus pre-merged bundles squeezed under Windsurf's character cap. Both still work and both are still updated, but skills are the recommended path — they load contextually instead of consuming your context window on every request.

Reach for these only if your tool has no skills support, or you want one static file you fully control:

• rules/ — six broad foundation files: effective_dart.md, flutter_app_architecture.md, flutter_errors.md, dart_3_updates.md, testing.md, code_review.md. Drop them in your project and reference them by name: "Read @rules/effective_dart.md and follow its conventions." Package-specific guidance (Bloc, Riverpod, Firebase, Mockito…) is skills-only now.
• combined/ — seven topic bundles, each in a full and an __under_6K variant. Paste one into your global or local rules config and you're done. The trimmed variants stay under 6,000 characters to fit Windsurf's global_rules.md hard limit.

GitHub Copilot lives here rather than in the skills section, because it has no SKILL.md support. Three options, in the order Copilot documents them:

• Copy a combined/ bundle to .github/copilot-instructions.md for repo-wide guidance.
• Copy rules/ files into .github/instructions/ as <name>.instructions.md, each with applyTo: "**/*.dart" frontmatter, so they only load for Dart files.
• Copilot also reads a root AGENTS.md, so a bundle pasted there works for Copilot, Codex, and Antigravity at once.

📏 Recommended file sizes by tool

Size guidance from each tool's own official documentation, for rule/instruction files and for SKILL.md files (accessed 2026-07-11).

Tool	Rule file — recommended size	SKILL.md — recommended size
Claude Code	CLAUDE.md: under 200 lines (soft)	Under 500 lines (soft); description 1,536 chars (hard)
Cursor	.mdc rule: under 500 lines (soft)	No numeric limit — "keep focused, move detail to separate files"
OpenAI Codex	AGENTS.md: no limit stated	Skill bundle: zip ≤ 50 MB, uncompressed file ≤ 25 MB, ≤ 500 files/version (no per-SKILL.md text limit)
Google Antigravity	rule file: 12,000 chars each (hard)	No numeric limit stated
Windsurf	global_rules.md: 6,000 chars; .windsurf/rules/*.md: 12,000 chars/file (hard)	No numeric limit — "keeps your context window lean"
GitHub Copilot	copilot-instructions.md: ≤ 2 pages (soft, approx.)	Not supported — no repo-level SKILL.md

Notes:

• Hard = enforced/truncated at the limit; soft = a documented quality recommendation.
• Only Claude Code publishes a numeric SKILL.md length recommendation (under 500 lines). Cursor, Windsurf, and Antigravity just say "keep it focused/lean" with no figure; OpenAI documents skill-bundle limits (50 MB zip / 25 MB per file / 500 files) rather than a text length; and GitHub Copilot has no repo-level SKILL.md — it uses copilot-instructions.md plus path-specific *.instructions.md (no size limit stated for the latter).
• Claude Code loads CLAUDE.md in full regardless of length, but notes files over 200 lines "consume more context and reduce adherence"; its auto-memory MEMORY.md loads only the "first 200 lines or 25KB, whichever comes first."
• Windsurf is still named Windsurf; its docs are served through Cognition (docs.windsurf.com → docs.devin.ai) and reference .windsurf/rules and .windsurf/skills.
• This repo keeps the combined/ sets under 6,000 characters to satisfy the strictest hard limit above (Windsurf global_rules.md).

Official sources: Claude Code — memory · skills | Cursor — rules · skills | OpenAI Codex — AGENTS.md · skills | Google Antigravity — rules · skills | Windsurf — rules & skills | GitHub Copilot — instructions

📌 No opinions, just documentation

Every skill is sourced from official documentation — no personal preferences or subjective interpretations. That's intentional. You're free to alter them to taste, but this repo stays objective by sticking to the source.

One consequence worth knowing: skills can contradict each other, because their sources do. If one package recommends a folder layout and another recommends a different one, you'll see both.

Content is re-fetched from upstream docs on a schedule, so skills track the official guidance as it changes rather than freezing at whatever was true when they were written.

🛠️ Contributing

Contributions are welcome:

1. Fork this repository.
2. Add or modify a skill in skills/, or a rule in rules/.
3. Open a pull request explaining the change.

Include an official documentation link for anything you add or change. That's the one hard requirement — it's what keeps the repo objective and reviewable. If your source isn't already listed in ATTRIBUTION.md, add it there with its license — and if that license isn't a permissive one, restate the guidance instead of quoting it.

📚 Sources

Official documentation these skills are built from:

Flutter — App Architecture · Common Errors · Simple State Management

Dart — Effective Dart · Language tour · Records · Patterns · Pattern types · Branches

State management — Bloc · Riverpod · Provider

Testing — Mockito · Mocktail · Patrol

Firebase — Firebase for Flutter · FlutterFire · Multiple flavors with the FlutterFire CLI

📄 License

MIT — for this repository's own content: the choice of topics, the trigger descriptions, and the wording and structure of every skill.

The underlying documentation keeps its own terms. Most of it is CC BY 4.0 (Flutter, Dart, Firebase), with code samples under BSD-3 or Apache 2.0, package READMEs under MIT or Apache 2.0, and a few sources — Apple, Google Play, RevenueCat — that aren't openly licensed and are therefore restated as fact rather than copied. ATTRIBUTION.md maps every source to its license and to the skills built on it.

If you redistribute this repo or lift a single skill out of it, keep the source links — that's what the CC BY attribution requirement actually asks for.