agentmods.dev

flutter-error-handling

flutter-error-handling is a skill for Claude Code, Codex from yendangn/flutter-app-builder. It costs 58 tokens per session (424 once invoked), scanned A, original, MIT.

An error-handling setup for Flutter apps that catches framework, platform and asynchronous errors and displays a fallback screen when a widget fails.

In plain words
What is it for?
Use it to connect error reporting and logging, catch uncaught errors, add recovery screens around feature areas, and show detailed messages outside production.
Why use it?
It brings different kinds of failures into one reporting path and separates expected app errors from unexpected crashes.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 6repo +1 3mo ago A scan 58 tokens original MIT

Good fit Use it to connect error reporting and logging, catch uncaught errors, add recovery screens around feature areas, and show detailed messages outside production.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/yendangn/flutter-app-builder/flutter-error-handling
View source ↗ yendangn/flutter-app-builder
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add yendangn/flutter-app-builder --skill flutter-error-handling
Clone the repo
git clone --depth 1 https://github.com/yendangn/flutter-app-builder

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for flutter-error-handling

README.md
[![agentmods](https://agentmods.dev/badge/skills/yendangn/flutter-app-builder/flutter-error-handling/github.svg)](https://agentmods.dev/skills/yendangn/flutter-app-builder/flutter-error-handling)
Your own site
<a href="https://agentmods.dev/skills/yendangn/flutter-app-builder/flutter-error-handling"><img src="https://agentmods.dev/badge/skills/yendangn/flutter-app-builder/flutter-error-handling/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for flutter-error-handling

Your own site · 80×15
<a href="https://agentmods.dev/skills/yendangn/flutter-app-builder/flutter-error-handling"><img src="https://agentmods.dev/badge/skills/yendangn/flutter-app-builder/flutter-error-handling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 424 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00058 $0.00424
Opus 5.5 $0.00023 $0.00170
Sonnet 5.5 $0.00012 $0.00085
Haiku 4.5 $0.00006 $0.00042

Measured 1mo ago against content hash 7bb47824bc41, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

flutter-error-handling scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/flutter-error-handling/SKILL.md · 37 lines

What it actually says

Flutter Error Handling

Full reference: template.md

Key rules

  • ErrorHandler is the central service. Wire it to three sources in appBootstrap():
    1. FlutterError.onError — Flutter framework errors (layout overflow, widget errors).
    2. PlatformDispatcher.instance.onError — platform-level uncaught errors.
    3. runZonedGuarded — Dart zone errors (async exceptions not caught elsewhere).
  • ErrorHandler forwards to AppLogger.error() + CrashReporter.recordError().
  • ErrorBoundary widget wraps subtrees that might throw during build. On error, renders a fallback AppErrorState. Place at feature boundaries, not globally.
  • In dev/uat: show error details in ErrorBoundary fallback. In prod: show generic message only.
  • FailureException is expected — it represents a known domain error. Do not forward to CrashReporter. Log at warn level only.
  • Unknown exceptions (not FailureException) are unexpected — always forward to CrashReporter.

Files

lib/src/core/error/
  failure.dart            ← sealed Failure + FailureException
  error_handler.dart      ← interface + impl (wires zone guard, FlutterError, PlatformDispatcher)
  error_boundary.dart     ← widget (wraps subtree, catches build errors)

Co-load with

  • flutter-logging — ErrorHandler calls AppLogger.error()
  • flutter-analytics — forward unexpected errors to CrashReporter
  • flutter-di — ErrorHandler registered as singleton, called in bootstrap
  • flutter-flavors — error detail visibility depends on env
Files

What ships with it

8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 37 lines · 58 tokens per session scan A 7bb47824bc41

Subscribe to this mod's changes

flutter-error-handling is a skill published in the GitHub repository yendangn/flutter-app-builder (6 stars, last pushed 3mo ago), licensed MIT. It adds 58 tokens to every session and 424 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

DebuggingMobile
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