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Agent skill

Flutter Animating Apps

by btwld in btwld/superdeck

Implements animated effects, transitions, and motion in a Flutter app.

BSD-3-ClauseAuto-check passedMobile

Install Flutter Animating Apps

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

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

GitHub CLI
$ gh skill install btwld/superdeck flutter-animating-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-animating-apps .claude/skills/flutter-animating-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/

Facts

Skill name
flutter-animating-apps
GitHub stars
130
Token cost
~1.9k tokens
SKILL.md length
566 words
Files
1
Skills in repo
23
Repo updated
First seen
Licence
BSD-3-Clause

At a glance

Implements animated effects, transitions, and motion in a Flutter app.

  • Adding visual feedback
  • SKILL.md covers Contents, Core Concepts, Animation Strategies and Workflows, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Shared element transitions

What it does

Flutter Animating Apps is an agent skill from btwld/superdeck. Implements animated effects, transitions, and motion in a Flutter app. Use when adding visual feedback, shared element transitions, or physics-based animations.

Its SKILL.md is about 1.9k 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. It works with Flutter. The repository describes itself as: Presentation slides for Flutter with Flutter. The licence is BSD-3-Clause.

When your agent uses it

  • Adding visual feedback
  • Shared element transitions
  • Physics-based animations

Example prompts

  • “Use the flutter-animating-apps skill to implement animated effects, transitions, and motion in a Flutter app”
  • “/flutter-animating-apps”

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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are dart).

    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 Animating Apps loads about 1.9k tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 566 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~1.9k

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). 566 words, ~1,943 tokens.

Download SKILL.mdSave it as .claude/skills/flutter-animating-apps/SKILL.md (or your agent's skills folder).
name
flutter-animating-apps
description
Implements animated effects, transitions, and motion in a Flutter app. Use when adding visual feedback, shared element transitions, or physics-based animations.
metadata.model
models/gemini-3.1-pro-preview
metadata.last_modified
Thu, 12 Mar 2026 22:16:34 GMT

Implementing Flutter Animations

Contents

Core Concepts

Manage Flutter animations using the core typed Animation system. Do not manually calculate frames; rely on the framework's ticker and interpolation classes.

  • Animation<T>: Treat this as an abstract representation of a value that changes over time. It holds state (completed, dismissed) and notifies listeners, but knows nothing about the UI.
  • AnimationController: Instantiate this to drive the animation. It generates values (typically 0.0 to 1.0) tied to the screen refresh rate. Always provide a vsync (usually via SingleTickerProviderStateMixin) to prevent offscreen resource consumption. Always dispose() controllers to prevent memory leaks.
  • Tween<T>: Define a stateless mapping from an input range (usually 0.0-1.0) to an output type (e.g., Color, Offset, double). Chain tweens with curves using .animate().
  • Curve: Apply non-linear timing (e.g., Curves.easeIn, Curves.bounceOut) to an animation using a CurvedAnimation or CurveTween.

Animation Strategies

Apply conditional logic to select the correct animation approach:

  • If animating simple property changes (size, color, opacity) without playback control: Use Implicit Animations (e.g., AnimatedContainer, AnimatedOpacity, TweenAnimationBuilder).
  • If requiring playback control (play, pause, reverse, loop) or coordinating multiple properties: Use Explicit Animations (e.g., AnimationController with AnimatedBuilder or AnimatedWidget).
  • If animating elements between two distinct routes: Use Hero Animations (Shared Element Transitions).
  • If modeling real-world motion (e.g., snapping back after a drag): Use Physics-Based Animations (e.g., SpringSimulation).
  • If animating a sequence of overlapping or delayed motions: Use Staggered Animations (multiple Tweens driven by a single AnimationController using Interval curves).

Workflows

Implementing Implicit Animations

Use this workflow for "fire-and-forget" state-driven animations.

  • Task Progress:
    • Identify the target properties to animate (e.g., width, color).
    • Replace the static widget (e.g., Container) with its animated counterpart (e.g., AnimatedContainer).
    • Define the duration property.
    • (Optional) Define the curve property for non-linear motion.
    • Trigger the animation by updating the properties inside a setState() call.
    • Run validator -> review UI for jank -> adjust duration/curve if necessary.
Show full SKILL.md (246 more words)Show less
Implementing Explicit Animations

Use this workflow when you need granular control over the animation lifecycle.

  • Task Progress:
    • Add SingleTickerProviderStateMixin (or TickerProviderStateMixin for multiple controllers) to the State class.
    • Initialize an AnimationController in initState(), providing vsync: this and a duration.
    • Define a Tween and chain it to the controller using .animate().
    • Wrap the target UI in an AnimatedBuilder (preferred for complex trees) or subclass AnimatedWidget.
    • Pass the Animation object to the AnimatedBuilder's animation property.
    • Control playback using controller.forward(), controller.reverse(), or controller.repeat().
    • Call controller.dispose() in the dispose() method.
    • Run validator -> check for memory leaks -> ensure dispose() is called.
Implementing Hero Transitions

Use this workflow to fly a widget between two routes.

  • Task Progress:
    • Wrap the source widget in a Hero widget.
    • Assign a unique, data-driven tag to the source Hero.
    • Wrap the destination widget in a Hero widget.
    • Assign the exact same tag to the destination Hero.
    • Ensure the widget trees inside both Hero widgets are visually similar to prevent jarring jumps.
    • Trigger the transition by pushing the destination route via Navigator.
Implementing Physics-Based Animations

Use this workflow for gesture-driven, natural motion.

  • Task Progress:
    • Set up an AnimationController (do not set a fixed duration).
    • Capture gesture velocity using a GestureDetector (e.g., onPanEnd providing DragEndDetails).
    • Convert the pixel velocity to the coordinate space of the animating property.
    • Instantiate a SpringSimulation with mass, stiffness, damping, and the calculated velocity.
    • Drive the controller using controller.animateWith(simulation).

Examples

<details>
<summary><b>Example: Explicit Animation (Staggered with AnimatedBuilder)</b></summary>
dart
class StaggeredAnimationDemo extends StatefulWidget {
  @override
  State<StaggeredAnimationDemo> createState() => _StaggeredAnimationDemoState();
}

class _StaggeredAnimationDemoState extends State<StaggeredAnimationDemo> with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<double> _widthAnimation;
  late Animation<Color?> _colorAnimation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(seconds: 2),
      vsync: this,
    );

    // Staggered width animation (0.0 to 0.5 interval)
    _widthAnimation = Tween<double>(begin: 50.0, end: 200.0).animate(
      CurvedAnimation(
        parent: _controller,
        curve: const Interval(0.0, 0.5, curve: Curves.easeIn),
      ),
    );

    // Staggered color animation (0.5 to 1.0 interval)
    _colorAnimation = ColorTween(begin: Colors.blue, end: Colors.red).animate(
      CurvedAnimation(
        parent: _controller,
        curve: const Interval(0.5, 1.0, curve: Curves.easeOut),
      ),
    );

    _controller.forward();
  }

  @override
  void dispose() {
    _controller.dispose(); // CRITICAL: Prevent memory leaks
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _controller,
      builder: (context, child) {
        return Container(
          width: _widthAnimation.value,
          height: 50.0,
          color: _colorAnimation.value,
        );
      },
    );
  }
}
</details>
<details>
<summary><b>Example: Custom Page Route Transition</b></summary>
dart
Route createCustomRoute(Widget destination) {
  return PageRouteBuilder(
    pageBuilder: (context, animation, secondaryAnimation) => destination,
    transitionsBuilder: (context, animation, secondaryAnimation, child) {
      const begin = Offset(0.0, 1.0); // Start from bottom
      const end = Offset.zero;
      const curve = Curves.easeOut;

      final tween = Tween(begin: begin, end: end).chain(CurveTween(curve: curve));
      final offsetAnimation = animation.drive(tween);

      return SlideTransition(
        position: offsetAnimation,
        child: child,
      );
    },
  );
}

// Usage: Navigator.of(context).push(createCustomRoute(const NextPage()));
</details>

© btwld, BSD-3-Clause. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

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

Open the folder on GitHubat commit 815a746

Compare with similar skills

Flutter Animating 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 Animating Apps compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Flutter Animating Apps this skillbtwld/superdeck130—~1.9kAutomated safety check: PassBSD-3-Clause
Add Flutter Docusaurus Localematthiasn/lotti1.2k—~1.2kAutomated safety check: PassGPL-3.0
Tm Launcher DesignFar-Se/tabame372—~3.1kAutomated safety check: PassMIT
Mobile App UI Designceorkm/mobile-app-ui-design400—~2kAutomated safety check: PassNone
Marionette Flutter Drive Appleancodepl/marionette_mcp473—~11kAutomated safety check: PassApache-2.0
Flutter ScreenshotJustLookAtNow/pt_mate503—~511Automated safety check: PassMIT

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Works with

Categories

Questions about Flutter Animating Apps

What does Flutter Animating Apps do?

Implements animated effects, transitions, and motion in a Flutter app. Flutter Animating Apps is an agent skill from btwld/superdeck. Implements animated effects, transitions, and motion in a Flutter app.

When should I use Flutter Animating Apps?

Flutter Animating Apps fits situations like: adding visual feedback; shared element transitions; physics-based animations.

How do I install Flutter Animating Apps in Claude Code?

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

How do I install Flutter Animating Apps in Codex?

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

Can I use Flutter Animating 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-animating-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-animating-apps, .gemini/skills/flutter-animating-apps, .github/skills/flutter-animating-apps and .opencode/skills/flutter-animating-apps in your project.

What does Flutter Animating Apps need to run?

SKILL.md names no scripts, command-line tools or credentials: Flutter Animating Apps is instructions for the agent only.

Does Flutter Animating 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 Animating 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 Animating Apps use?

Flutter Animating 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 Animating Apps use?

About 1.9k tokens (SKILL.md is roughly 7.8k 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 Animating Apps?

Skills that share tags, products or a category with Flutter Animating Apps: Add Flutter Docusaurus Locale (matthiasn/lotti, 1.2k stars), Tm Launcher Design (Far-Se/tabame, 372 stars), Mobile App UI Design (ceorkm/mobile-app-ui-design, 400 stars) and Marionette Flutter Drive App (leancodepl/marionette_mcp, 473 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Flutter Animating 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.