Senior Mobile
borghei/Claude-Skills
A skill your agent uses when the user asks to "build a mobile app", "scaffold React Native project", "create SwiftUI views", "set up Jetpack Compose", "optimize mobile performance", "configure Expo…
Measures and optimizes the size of Flutter application bundles for deployment.
Install Flutter Reducing App Size
$ npx skills add btwld/superdeck --skill flutter-reducing-app-size -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install btwld/superdeck flutter-reducing-app-size --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/btwld/superdeck.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/flutter-reducing-app-size .claude/skills/flutter-reducing-app-size && 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-reducing-app-size" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-reducing-app-size into .claude/skills/flutter-reducing-app-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-reducing-app-size", 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/btwld/superdeck/tree/main/.agents/skills/flutter-reducing-app-sizeType 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 btwld/superdeck --skill flutter-reducing-app-size -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install btwld/superdeck flutter-reducing-app-size --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/flutter-reducing-app-size .agents/skills/flutter-reducing-app-size && 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-reducing-app-size" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-reducing-app-size into .agents/skills/flutter-reducing-app-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-reducing-app-size", 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 btwld/superdeck --skill flutter-reducing-app-size -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install btwld/superdeck flutter-reducing-app-size --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/flutter-reducing-app-size .cursor/skills/flutter-reducing-app-size && 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-reducing-app-size" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-reducing-app-size into .cursor/skills/flutter-reducing-app-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-reducing-app-size", 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/btwld/superdeck.git --path .agents/skills/flutter-reducing-app-size--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 btwld/superdeck --skill flutter-reducing-app-size -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install btwld/superdeck flutter-reducing-app-size --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/flutter-reducing-app-size .gemini/skills/flutter-reducing-app-size && 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-reducing-app-size" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-reducing-app-size into .gemini/skills/flutter-reducing-app-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-reducing-app-size", 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 btwld/superdeck flutter-reducing-app-sizeInstalls 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 btwld/superdeck --skill flutter-reducing-app-size -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/flutter-reducing-app-size .github/skills/flutter-reducing-app-size && 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-reducing-app-size" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-reducing-app-size into .github/skills/flutter-reducing-app-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-reducing-app-size", 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 btwld/superdeck --skill flutter-reducing-app-size -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install btwld/superdeck flutter-reducing-app-size --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/btwld/superdeck.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/flutter-reducing-app-size .opencode/skills/flutter-reducing-app-size && 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-reducing-app-size" agent skill from https://github.com/btwld/superdeck/tree/main/.agents/skills/flutter-reducing-app-size into .opencode/skills/flutter-reducing-app-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flutter-reducing-app-size", 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-reducing-app-size- GitHub stars
- 130
- Token cost
- ~1.4k tokens
- SKILL.md length
- 602 words
- Files
- 1
- Skills in repo
- 23
- Repo updated
- First seen
- Licence
- BSD-3-Clause
At a glance
Measures and optimizes the size of Flutter application bundles for deployment.
- Works in 4 steps: Identify the largest contributors to app… → Determine if the dependency or asset is… → Remove, replace, or optimize the… → …
- Minimizing download size
- SKILL.md covers Contents, Core Concepts, Workflow: Generating Size… and Workflow: Analyzing Size Data…, plus 3 more sections
- Calls flutter and dart
What it does
Flutter Reducing App Size is an agent skill from btwld/superdeck. Measures and optimizes the size of Flutter application bundles for deployment. Use when minimizing download size or meeting app store package constraints.
Its SKILL.md is about 1.4k 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, App store release and Mobile performance. 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
- Minimizing download size
- Meeting app store package constraints
Example prompts
- “Use the flutter-reducing-app-size skill to measure and optimizes the size of Flutter application bundles for deployment”
- “/flutter-reducing-app-size”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Identify the largest contributors to app size.
- Determine if the dependency or asset is strictly necessary.
- Remove, replace, or optimize the identified component.
- Regenerate the Size Analysis JSON and compare the new build against the old build using the DevTools "Diff" tab.
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:
flutterdart
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 Reducing App Size loads about 1.4k tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 602 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 btwld/superdeck at commit 815a746, republished under its BSD-3-Clause licence (© btwld). 602 words, ~1,414 tokens.
Download SKILL.mdSave it as
.claude/skills/flutter-reducing-app-size/SKILL.md (or your agent's skills folder).- name
- flutter-reducing-app-size
- description
- Measures and optimizes the size of Flutter application bundles for deployment. Use when minimizing download size or meeting app store package constraints.
- metadata.model
- models/gemini-3.1-pro-preview
- metadata.last_modified
- Thu, 12 Mar 2026 22:22:44 GMT
Reducing Flutter App Size
Contents
- Core Concepts
- Workflow: Generating Size Analysis Files
- Workflow: Analyzing Size Data in DevTools
- Workflow: Estimating iOS Download Size
- Workflow: Implementing Size Reduction Strategies
- Examples
Core Concepts
- Debug vs. Release: Never use debug builds to measure app size. Debug builds include VM overhead and lack Ahead-Of-Time (AOT) compilation and tree-shaking.
- Upload vs. Download Size: The size of an upload package (APK, AAB, IPA) does not represent the end-user download size. App stores filter redundant native library architectures and asset densities based on the target device.
- AOT Tree-Shaking: The Dart AOT compiler automatically removes unused or unreachable code in profile and release modes.
- Size Analysis JSON: The
--analyze-sizeflag generates a*-code-size-analysis_*.jsonfile detailing the byte size of packages, libraries, classes, and functions.
Workflow: Generating Size Analysis Files
Use this workflow to generate the raw data required for size analysis.
Task Progress:
- Determine the target platform (apk, appbundle, ios, linux, macos, windows).
- Run the Flutter build command with the
--analyze-sizeflag. - Locate the generated
*-code-size-analysis_*.jsonfile in thebuild/directory.
Conditional Logic:
- If targeting Android: Run
flutter build apk --analyze-sizeorflutter build appbundle --analyze-size. - If targeting iOS: Run
flutter build ios --analyze-size. Note: This creates a.appfile useful for relative content sizing, but not for estimating final App Store download size. Use the Estimating iOS Download Size workflow for accurate iOS metrics. - If targeting Desktop: Run
flutter build [windows|macos|linux] --analyze-size.
Workflow: Analyzing Size Data in DevTools
Use this workflow to visualize and drill down into the Size Analysis JSON.
Task Progress:
- Launch DevTools by running
dart devtoolsin the terminal. - Select "Open app size tool" from the DevTools landing page.
- Upload the generated
*-code-size-analysis_*.jsonfile. - Inspect the treemap or tree view to identify large packages, libraries, or assets.
- Feedback Loop:
- Identify the largest contributors to app size.
- Determine if the dependency or asset is strictly necessary.
- Remove, replace, or optimize the identified component.
- Regenerate the Size Analysis JSON and compare the new build against the old build using the DevTools "Diff" tab.
Show full SKILL.md (261 more words)Show less
Workflow: Estimating iOS Download Size
Use this workflow to get an accurate projection of iOS download and installation sizes across different devices.
Task Progress:
- Configure the app version and build number in
pubspec.yaml. - Generate an Xcode archive by running
flutter build ipa --export-method development. - Open the generated archive (
build/ios/archive/*.xcarchive) in Xcode. - Click Distribute App and select Development.
- In the App Thinning configuration, select All compatible device variants.
- Check the option to Strip Swift symbols.
- Sign and export the IPA.
- Open the exported directory and review the
App Thinning Size Report.txtfile to evaluate projected sizes per device.
Workflow: Implementing Size Reduction Strategies
Apply these strategies to actively reduce the compiled footprint of the application.
Task Progress:
- Split Debug Info: Strip debug symbols from the compiled binary and store them in separate files.
- Remove Unused Resources: Audit the
pubspec.yamlandassets/directory. Delete any images, fonts, or files not actively referenced in the codebase. - Minimize Library Resources: Review third-party packages. If a package imports massive resource files (e.g., large icon sets or localization files) but only a fraction is used, consider alternative packages or custom implementations.
- Compress Media: Compress all PNG and JPEG assets using tools like
pngquant,imageoptim, or WebP conversion before bundling them into the app.
Examples
Generating Size Analysis (Android)
# Generate the size analysis JSON for an Android App Bundle
flutter build appbundle --analyze-size --target-platform=android-arm64Splitting Debug Info (Release Build)
# Build an APK while stripping debug info to reduce binary size
flutter build apk --obfuscate --split-debug-info=build/app/outputs/symbolsReading the iOS App Thinning Size Report
When reviewing App Thinning Size Report.txt, look for the specific target device to understand the true impact on the user:
Variant: Runner-7433FC8E-1DF4-4299-A7E8-E00768671BEB.ipa
Supported variant descriptors: [device: iPhone12,1, os-version: 13.0]
App + On Demand Resources size: 5.4 MB compressed, 13.7 MB uncompressed
App size: 5.4 MB compressed, 13.7 MB uncompressedInterpretation: The end-user download size (compressed) is 5.4 MB, and the on-device footprint (uncompressed) is 13.7 MB.
© 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-reducing-app-size of btwld/superdeck.
Open the folder on GitHubat commit 815a746
Compare with similar skills
Flutter Reducing App Size 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 Reducing App Size this skillbtwld/superdeck | 130 | — | ~1.4k | Automated safety check: Pass | BSD-3-Clause | |
| Senior Mobileborghei/Claude-Skills | 881 | — | ~1.9k | Automated safety check: Pass | MIT | |
| OdevioOdevio/Odevio-CLI | 423 | — | ~7.6k | Automated safety check: Pass | MIT | |
| Flutter Appccplugins/awesome-claude-code-plugins | 968 | — | ~1.1k | Automated safety check: Notes | Apache-2.0 | |
| Android Designhashgraph-online/awesome-codex-plugins | 1.2k | — | ~2.5k | Automated safety check: Pass | Apache-2.0 | |
| Ffmpeg Kit macOS Codesign Crashdivinevideo/divine-mobile | 266 | — | ~1.1k | Automated safety check: Pass | MPL-2.0 |
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Categories
Questions about Flutter Reducing App Size
What does Flutter Reducing App Size do?
Measures and optimizes the size of Flutter application bundles for deployment. Flutter Reducing App Size is an agent skill from btwld/superdeck. Measures and optimizes the size of Flutter application bundles for deployment.
When should I use Flutter Reducing App Size?
Flutter Reducing App Size fits situations like: minimizing download size; meeting app store package constraints.
How do I install Flutter Reducing App Size in Claude Code?
Run `npx skills add btwld/superdeck --skill flutter-reducing-app-size -a claude-code`. Or copy the skill folder (.agents/skills/flutter-reducing-app-size in btwld/superdeck) into .claude/skills/flutter-reducing-app-size in your project. Claude Code loads it when a task matches its description.
How do I install Flutter Reducing App Size in Codex?
Run `npx skills add btwld/superdeck --skill flutter-reducing-app-size -a codex`. Or copy the skill folder (.agents/skills/flutter-reducing-app-size in btwld/superdeck) into .agents/skills/flutter-reducing-app-size in your project. Codex loads it when a task matches its description.
Can I use Flutter Reducing App Size 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-reducing-app-size -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-reducing-app-size, .gemini/skills/flutter-reducing-app-size, .github/skills/flutter-reducing-app-size and .opencode/skills/flutter-reducing-app-size in your project.
What does Flutter Reducing App Size need to run?
Going by SKILL.md and its folder, Flutter Reducing App Size needs the command-line tools its instructions call (flutter and dart).
Does Flutter Reducing App Size 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 Reducing App Size 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 Reducing App Size use?
Flutter Reducing App Size 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 Reducing App Size use?
About 1.4k tokens (SKILL.md is roughly 5.7k 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 Reducing App Size?
Skills that share tags, products or a category with Flutter Reducing App Size: Senior Mobile (borghei/Claude-Skills, 881 stars), Odevio (Odevio/Odevio-CLI, 423 stars), Flutter App (ccplugins/awesome-claude-code-plugins, 968 stars) and Android Design (hashgraph-online/awesome-codex-plugins, 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 Reducing App Size?
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.