monitoring

monitoring is a skill for Claude Code from sonature-lab/timsquad. It costs 36 tokens per session (1,021 once invoked), scanned A, original, MIT.

A guide for monitoring Flutter apps in production using crash reports, usage events, performance measurements, and structured logs. It covers Firebase Crashlytics, Analytics, Performance Monitoring, and Sentry.

In plain words
What is it for?
Use it to configure crash capture, analytics events, performance traces, Sentry integration, structured logging, alerts, and masking of sensitive data.
Why use it?
It helps teams find crashes, errors, slow operations, and user behavior problems after an app has been released.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Good fit Use it to configure crash capture, analytics events, performance traces, Sentry integration, structured logging, alerts, and masking of sensitive data.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sonature-lab/timsquad/monitoring
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 sonature-lab/timsquad --skill monitoring
Clone the repo
git clone --depth 1 https://github.com/sonature-lab/timsquad

Made for: Claude Code.

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 monitoring

README.md
[![agentmods](https://agentmods.dev/badge/skills/sonature-lab/timsquad/monitoring/github.svg)](https://agentmods.dev/skills/sonature-lab/timsquad/monitoring)
Your own site
<a href="https://agentmods.dev/skills/sonature-lab/timsquad/monitoring"><img src="https://agentmods.dev/badge/skills/sonature-lab/timsquad/monitoring/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 monitoring

Your own site · 80×15
<a href="https://agentmods.dev/skills/sonature-lab/timsquad/monitoring"><img src="https://agentmods.dev/badge/skills/sonature-lab/timsquad/monitoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,021 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 $0.00036 $0.01021
Opus 5.5 $0.00014 $0.00408
Sonnet 5.5 $0.00007 $0.00204
Haiku 4.5 $0.00004 $0.00102

Measured 1mo ago against content hash f3d34950abc4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

monitoring 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.

templates/base/skills/tsq-flutter/monitoring/SKILL.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Monitoring & Analytics

Flutter 앱 모니터링 통합 가이드. Firebase Crashlytics + Analytics + Performance, Sentry, 구조화된 로깅으로 프로덕션 품질을 수치로 관리.

Philosophy

  • 크래시는 0순위 — Crashlytics 비활성화 금지, 모든 비치명 에러도 기록
  • 이벤트는 설계 — 무분별한 로깅 금지, 이벤트 택소노미 먼저 정의
  • 성능은 측정 — 체감이 아닌 custom trace와 HTTP metric으로 수치화

Resources

5개 규칙 + 1개 참조. 크래시부터 로깅까지 모니터링 파이프라인 전체를 커버.

Priority Type Resource Description
CRITICAL rule crashlytics-setup Crashlytics 초기화, 에러 캡처, 사용자 식별
HIGH rule analytics Analytics 이벤트 택소노미, 사용자 속성, 화면 추적
HIGH rule performance-monitoring Performance custom trace, HTTP metric, 프레임 모니터링
MEDIUM rule sentry-integration Sentry 초기화, breadcrumbs, scope, Crashlytics 공존
MEDIUM rule logging 구조화된 로깅, 레벨 관리, 민감 데이터 마스킹
— ref monitoring-architecture 모니터링 레이어, 대시보드, 알림, 데이터 보존

Quick Rules

Crashlytics

  • FlutterError.onError = FirebaseCrashlytics.instance.recordFlutterFatalError
  • PlatformDispatcher.instance.onError → 비동기 에러 캡처
  • 비치명 에러 → recordError(error, stack, fatal: false)
  • setUserIdentifier → 크래시와 사용자 매핑
  • setCustomKey → 디바이스 상태, 기능 플래그 등 컨텍스트

Analytics

  • 이벤트 택소노미 먼저 정의 (screen_view, button_click, feature_use)
  • setUserProperty → user_type, subscription_tier 등 세그먼트 기준
  • AnalyticsObserver → go_router 화면 전환 자동 추적
  • 디버그 → adb shell setprop debug.firebase.analytics.app <package>

Performance

  • FirebasePerformance.instance.newTrace('name') → custom trace
  • HTTP metric → 자동 수집 (dio interceptor 또는 http_client)
  • 느린 프레임 임계값 16ms (60fps), 8ms (120fps)

Sentry

  • SentryFlutter.init → DSN 환경별 분리 (dev/staging/prod)
  • Sentry.addBreadcrumb → 네비게이션, HTTP, 사용자 액션 추적
  • Crashlytics + Sentry 공존 → 각자 역할 분리 (crash vs context)

Logging

  • logger 패키지 → 레벨별 색상 출력 (개발), JSON 구조화 (프로덕션)
  • 릴리스 빌드 → verbose/debug 레벨 비활성화
  • 민감 데이터 (토큰, PII) → 마스킹 필수

Read the full file on GitHub · 82 lines

Files

What ships with it

6 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 · 82 lines · 36 tokens per session scan A f3d34950abc4

Subscribe to this mod's changes

monitoring is a skill published in the GitHub repository sonature-lab/timsquad (12 stars, last pushed 1mo ago), licensed MIT. It adds 36 tokens to every session and 1,021 once invoked, about $0.0001 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 2026-08-30.

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