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Agent skill

Flutter Concurrency

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Execute long-running tasks in background isolates to keep the UI responsive.

MITAuto-check passedMobile

Install Flutter Concurrency

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill flutter-concurrency -a claude-code

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

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard flutter-concurrency --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/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/flutter/flutter-concurrency .claude/skills/flutter-concurrency && 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-concurrency
GitHub stars
572
Token cost
~680 tokens
SKILL.md length
269 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Execute long-running tasks in background isolates to keep the UI responsive.

  • Performing heavy computations
  • SKILL.md covers Priority: P1 (HIGH), Core Concepts, Decision Matrix and Workflow: Offloading Heavy…, plus 5 more sections
  • Calls flutter
  • Parsing large datasets

What it does

Flutter Concurrency is an agent skill from HoangNguyen0403/agent-skills-standard. Execute long-running tasks in background isolates to keep the UI responsive. Use when performing heavy computations, parsing large datasets, or choosing between async/await and isolates.

Its SKILL.md is about 680 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/isolate-examples.md`).

It sits in Mobile, covering Cross-platform mobile apps and Async programming. It works with Flutter and Dart. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Performing heavy computations
  • Parsing large datasets
  • Choosing between async/await and isolates

Example prompts

  • “/flutter-concurrency”

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. 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:

    • flutter

    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 Concurrency loads about 680 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 52 tokens; SKILL.md has 269 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~52
When it runs · the whole SKILL.md, loaded when a task matches
~680
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.3k

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 HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 269 words, ~680 tokens.

Download SKILL.mdSave it as .claude/skills/flutter-concurrency/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
flutter-concurrency
description
Execute long-running tasks in background isolates to keep the UI responsive. Use when performing heavy computations, parsing large datasets, or choosing between async/await and isolates.

Dart Concurrency and Isolates

Priority: P1 (HIGH)

Core Concepts

Dart uses a single-threaded event loop. All Flutter code runs on the Main Isolate by default. Blocking it causes jank.

  • async/await: For non-blocking I/O (network, file). The event loop continues while waiting.
  • Isolates: Dart's lightweight threads with isolated memory. Communicate via message passing only.

Decision Matrix

ConditionApproach
I/O bound (HTTP, database)async/await on Main Isolate
CPU-bound, < 16msasync/await on Main Isolate
CPU-bound, one-off heavy taskIsolate.run()
Continuous background processingIsolate.spawn() with ports

Workflow: Offloading Heavy Computation

  • 1. Identify the CPU-bound operation blocking the UI.
  • 2. Extract computation into a standalone top-level or static function.
  • 3. Ensure the function accepts exactly one argument (Isolate constraint).
  • 4. Call Isolate.run(() => myFunction(data)).
  • 5. await the result on the Main Isolate.

Workflow: Long-Lived Worker Isolate

  • 1. Create a ReceivePort on the Main Isolate.
  • 2. Spawn worker with Isolate.spawn(entryPoint, mainPort.sendPort).
  • 3. In worker, create its own ReceivePort and send its SendPort back.
  • 4. Store worker's SendPort for bidirectional communication.
  • 5. Close ports and kill isolate on dispose.

See examples for complete code.

Anti-Patterns

  • No JSON parsing on Main Isolate: Large JSON decoding (>1MB) blocks frames. Use Isolate.run.
  • No shared mutable state: Isolates cannot share memory. Pass data via messages.
  • No FutureBuilder in build without caching: FutureBuilder re-fires on every rebuild if the future is created inline.

Verification

  • No frame drops during heavy computation (check with DevTools).
  • Worker isolates are disposed when no longer needed.
  • flutter test passes.

References

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • Dart Concurrency and Isolates

© HoangNguyen0403, 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 2 other files (references) in skills/flutter/flutter-concurrency of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/isolate-examples.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Flutter Concurrency 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 Concurrency compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Flutter Concurrency this skillHoangNguyen0403/agent-skills-standard572—~680Automated safety check: PassMIT
Squadron Workerd-markey/squadron138—~1.6kAutomated safety check: PassMIT
Flutter Handling Concurrencybtwld/superdeck130—~1.8kAutomated safety check: PassBSD-3-Clause
Signals Core Advanced Primitivesrodydavis/signals.dart819—~1.7kAutomated safety check: PassApache-2.0
Engine Whats Newflutter/flutter180k—~978Automated safety check: PassBSD-3-Clause
Flutter Cherry Pickflutter/flutter180k—~1.8kAutomated safety check: PassBSD-3-Clause

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Works with

Categories

Questions about Flutter Concurrency

What does Flutter Concurrency do?

Execute long-running tasks in background isolates to keep the UI responsive. Flutter Concurrency is an agent skill from HoangNguyen0403/agent-skills-standard. Execute long-running tasks in background isolates to keep the UI responsive.

When should I use Flutter Concurrency?

Flutter Concurrency fits situations like: performing heavy computations; parsing large datasets; choosing between async/await and isolates.

How do I install Flutter Concurrency in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill flutter-concurrency -a claude-code`. Or copy the skill folder (skills/flutter/flutter-concurrency in HoangNguyen0403/agent-skills-standard) into .claude/skills/flutter-concurrency in your project. Claude Code loads it when a task matches its description.

How do I install Flutter Concurrency in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill flutter-concurrency -a codex`. Or copy the skill folder (skills/flutter/flutter-concurrency in HoangNguyen0403/agent-skills-standard) into .agents/skills/flutter-concurrency in your project. Codex loads it when a task matches its description.

Can I use Flutter Concurrency 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 HoangNguyen0403/agent-skills-standard --skill flutter-concurrency -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-concurrency, .gemini/skills/flutter-concurrency, .github/skills/flutter-concurrency and .opencode/skills/flutter-concurrency in your project.

What does Flutter Concurrency need to run?

Going by SKILL.md and its folder, Flutter Concurrency needs the command-line tools its instructions call (flutter).

Does Flutter Concurrency 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 Concurrency 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 Concurrency use?

Flutter Concurrency is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Flutter Concurrency use?

About 680 tokens (SKILL.md is roughly 2.7k 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 655 tokens, read only when the agent opens those files.

What are the alternatives to Flutter Concurrency?

Skills that share tags, products or a category with Flutter Concurrency: Squadron Worker (d-markey/squadron, 138 stars), Flutter Handling Concurrency (btwld/superdeck, 130 stars), Signals Core Advanced Primitives (rodydavis/signals.dart, 819 stars) and Engine Whats New (flutter/flutter, 180k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Flutter Concurrency?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.