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Agent skill

Flutter Error Handling

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Implement functional repository error recovery with Either/Failure patterns in Flutter.

MITAuto-check passedMobile

Install Flutter Error Handling

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

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

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard flutter-error-handling --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-error-handling .claude/skills/flutter-error-handling && 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-error-handling
GitHub stars
572
Token cost
~640 tokens
SKILL.md length
243 words
Files
5 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Implement functional repository error recovery with Either/Failure patterns in Flutter.

  • Works in 8 steps: Define failures — Create domain-specific… → Return Either — Repositories return… → Catch in Infrastructure only —… → …
  • Handling exceptions
  • SKILL.md covers Priority: P1 (HIGH), Implementation Workflow, Reference & Examples and Anti-Patterns, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Flutter Error Handling is an agent skill from HoangNguyen0403/agent-skills-standard. Implement functional repository error recovery with Either/Failure patterns in Flutter. Use when handling exceptions or dartz Either types in data flows; defer UI-only retry buttons.

Its SKILL.md is about 640 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `evals/evals.json`, `references/REFERENCE.md` and `references/error-mapping.md`).

It sits in Mobile, covering Cross-platform mobile apps and Error handling. It works with Flutter. 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

  • Handling exceptions
  • Dartz Either types in data flows
  • Defer UI-only retry buttons

Example prompts

  • “/flutter-error-handling”

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

  1. Define failures — Create domain-specific failures using @freezed unions (e.g., UnauthorizedFailure, OutOfStockFailure).
  2. Return Either — Repositories return Either. No exceptions in UI/BLoC.
  3. Catch in Infrastructure only — Infrastructure catches exceptions (e.g., DioException) and returns Left(Failure). Never rethrow to UI.
  4. Fold in BLoC — Use .fold(failure, success) in BLoC to emit corresponding states. Remove try/catch from BLoC.
  5. Localize messages — Use failure.failureMessage (returns TRObject or localized string) for UI-safe text.
  6. Log with stable templates — Use low-cardinality message templates; pass variable data via metadata/context.
  7. No Silent Catch: Never swallow errors without logging or documented retry.
  8. Crashlytics Routing: All UI/BLoC catch blocks MUST route errors via AppLogger.error(AppException.fromException(e).message, error: e…

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

    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 Error Handling loads about 640 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 51 tokens; SKILL.md has 243 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~640
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.1k

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). 243 words, ~640 tokens.

Download SKILL.mdSave it as .claude/skills/flutter-error-handling/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
flutter-error-handling
description
Implement functional repository error recovery with Either/Failure patterns in Flutter. Use when handling exceptions or dartz Either types in data flows; defer UI-only retry buttons.

Error Handling

Priority: P1 (HIGH)

Implementation Workflow

  1. Define failures — Create domain-specific failures using @freezed unions (e.g., UnauthorizedFailure, OutOfStockFailure).
  2. Return Either — Repositories return Either<Failure, T>. No exceptions in UI/BLoC.
  3. Catch in Infrastructure only — Infrastructure catches exceptions (e.g., DioException) and returns Left(Failure). Never rethrow to UI.
  4. Fold in BLoC — Use .fold(failure, success) in BLoC to emit corresponding states. Remove try/catch from BLoC.
  5. Localize messages — Use failure.failureMessage (returns TRObject or localized string) for UI-safe text.
  6. Log with stable templates — Use low-cardinality message templates; pass variable data via metadata/context.
  7. No Silent Catch: Never swallow errors without logging or documented retry.
  8. Crashlytics Routing: All UI/BLoC catch blocks MUST route errors via AppLogger.error(AppException.fromException(e).message, error: e, stackTrace: st) for observability and type-safe UI messages.
Repository & BLoC Examples

See implementation examples for repository error mapping and BLoC consumption patterns.

Reference & Examples

For Failure definitions and API error mapping: See references/REFERENCE.md.

Anti-Patterns

  • No Try-Catch in BLoC: BLoC receives Either and folds; try/catch belongs in Infrastructure
  • No Plain String Failures: Define typed @freezed Failure subclasses instead of Left('Something went wrong')
  • No Empty Catch Blocks: Always log and propagate; never swallow errors silently
  • No Repositories Throwing Status: Return Left(Failure) instead of throwing Exception
  • No Missing Log Registration: Use AppLogger.error in BLoC/UI catch to ensure Crashlytics tracking and type-safe UI messages

layer-based-clean-architecture | bloc-state-management

Canonical response anchors

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

  • TRObject

© 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 4 other files (references) in skills/flutter/flutter-error-handling of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/REFERENCE.md
  • references/error-mapping.md
  • references/implementation.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Flutter Error Handling 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 Error Handling compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Flutter Error Handling this skillHoangNguyen0403/agent-skills-standard572—~640Automated safety check: PassMIT
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Flutter Initbear2u/my-skills932—~2.5kAutomated safety check: PassNone
Mobile App UI Designceorkm/mobile-app-ui-design409—~2kAutomated safety check: PassNone
Marionette Flutter Drive Appleancodepl/marionette_mcp482—~11kAutomated safety check: PassApache-2.0

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Works with

Categories

Questions about Flutter Error Handling

What does Flutter Error Handling do?

Implement functional repository error recovery with Either/Failure patterns in Flutter. Flutter Error Handling is an agent skill from HoangNguyen0403/agent-skills-standard. Implement functional repository error recovery with Either/Failure patterns in Flutter.

When should I use Flutter Error Handling?

Flutter Error Handling fits situations like: handling exceptions; dartz Either types in data flows; defer UI-only retry buttons.

How do I install Flutter Error Handling in Claude Code?

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

How do I install Flutter Error Handling in Codex?

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

Can I use Flutter Error Handling 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-error-handling -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-error-handling, .gemini/skills/flutter-error-handling, .github/skills/flutter-error-handling and .opencode/skills/flutter-error-handling in your project.

What does Flutter Error Handling need to run?

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

Does Flutter Error Handling 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 Error Handling 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 Error Handling use?

Flutter Error Handling 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 Error Handling use?

About 640 tokens (SKILL.md is roughly 2.6k 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 472 tokens, read only when the agent opens those files.

What are the alternatives to Flutter Error Handling?

Skills that share tags, products or a category with Flutter Error Handling: Add Flutter Docusaurus Locale (matthiasn/lotti, 1.2k stars), Tm Launcher Design (Far-Se/tabame, 372 stars), Flutter Init (bear2u/my-skills, 932 stars) and Mobile App UI Design (ceorkm/mobile-app-ui-design, 409 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Flutter Error Handling?

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.