sentry-flutter-sdk

name	sentry-flutter-sdk
description	Full Sentry SDK setup for Flutter and Dart. Use when asked to "add Sentry to Flutter", "install sentry_flutter", "setup Sentry in Dart", or configure error monitoring, tracing, profiling, session replay, or logging for Flutter applications. Supports Android, iOS, macOS, Linux, Windows, and Web.
license	Apache-2.0
category	sdk-setup
parent	sentry-sdk-setup
disable-model-invocation	true

All Skills > SDK Setup > Flutter SDK

Sentry Flutter SDK

Opinionated wizard that scans your Flutter or Dart project and guides you through complete Sentry setup — error monitoring, tracing, session replay, logging, profiling, and ecosystem integrations.

Invoke This Skill When

• User asks to "add Sentry to Flutter" or "set up Sentry" in a Flutter or Dart app
• User wants error monitoring, tracing, profiling, session replay, or logging in Flutter
• User mentions sentry_flutter, sentry_dart, mobile error tracking, or Sentry for Flutter
• User wants to monitor native crashes, ANRs, or app hangs on iOS/Android

Note: SDK versions and APIs below reflect sentry_flutter ≥9.14.0 (current stable, February 2026). Always verify against docs.sentry.io/platforms/flutter/ before implementing.

---

Phase 1: Detect

Run these commands to understand the project before making any recommendations:

# Detect Flutter project type and existing Sentry
cat pubspec.yaml | grep -E '(sentry|flutter|dart)'

# Check SDK version
cat pubspec.yaml | grep -A2 'environment:'

# Check for existing Sentry initialization
grep -r "SentryFlutter.init\|Sentry.init" lib/ 2>/dev/null | head -5

# Detect navigation library
grep -E '(go_router|auto_route|get:|beamer|routemaster)' pubspec.yaml

# Detect HTTP client
grep -E '(dio:|http:|chopper:)' pubspec.yaml

# Detect database packages
grep -E '(sqflite|drift|hive|isar|floor)' pubspec.yaml

# Detect state management (for integration patterns)
grep -E '(flutter_bloc|riverpod|provider:|get:)' pubspec.yaml

# Detect GraphQL
grep -E '(graphql|ferry|gql)' pubspec.yaml

# Detect Firebase
grep -E '(firebase_core|supabase)' pubspec.yaml

# Detect backend for cross-link
ls ../backend/ ../server/ ../api/ 2>/dev/null
find .. -maxdepth 3 \( -name "go.mod" -o -name "requirements.txt" -o -name "Gemfile" -o -name "*.csproj" \) 2>/dev/null | grep -v flutter | head -10

# Detect platform targets
ls android/ ios/ macos/ linux/ windows/ web/ 2>/dev/null

What to determine:

Question	Impact
sentry_flutter already in pubspec.yaml?	Skip install, jump to feature config
Dart SDK >=3.5?	Required for sentry_flutter ≥9.0.0
go_router or auto_route present?	Use SentryNavigatorObserver — specific patterns apply
dio present?	Recommend sentry_dio integration
sqflite, drift, hive, isar present?	Recommend matching sentry_* DB package
Has android/ and ios/ directories?	Full mobile feature set available
Has web/ directory only?	Session Replay and Profiling unavailable
Has macos/ directory?	Profiling available (alpha)
Backend directory detected?	Trigger Phase 4 cross-link

---

Phase 2: Recommend

Present a concrete recommendation based on what you found. Don't ask open-ended questions — lead with a proposal:

Recommended (core coverage — always set up these):

• ✅ Error Monitoring — captures Dart exceptions, Flutter framework errors, and native crashes (iOS + Android)
• ✅ Tracing — auto-instruments navigation, app start, network requests, and UI interactions
• ✅ Session Replay — captures widget tree screenshots for debugging (iOS + Android only)

Optional (enhanced observability):

• ⚡ Profiling — CPU profiling; iOS and macOS only (alpha)
• ⚡ Logging — structured logs via Sentry.logger.* and sentry_logging integration
• ⚡ Metrics — counters, gauges, distributions (SDK ≥9.11.0)

Platform limitations — be upfront:

Feature	Platforms	Notes
Session Replay	iOS, Android	Not available on macOS, Linux, Windows, Web
Profiling	iOS, macOS	Alpha status; not available on Android, Linux, Windows, Web
Native crashes	iOS, Android, macOS	NDK/signal handling; Linux/Windows/Web: Dart exceptions only
App Start metrics	iOS, Android	Not available on desktop/web
Slow/frozen frames	iOS, Android, macOS	Not available on Linux, Windows, Web
Crons	N/A	Not available in the Flutter/Dart SDK

Propose: "For your Flutter app targeting iOS/Android, I recommend Error Monitoring + Tracing + Session Replay. Want me to also add Logging and Profiling (iOS/macOS alpha)?"

---

Phase 3: Guide

Determine Your Setup Path

Project type	Recommended setup
Any Flutter app	Wizard CLI (handles pubspec, init, symbol upload)
Manual preferred	Path B below — pubspec.yaml + main.dart
Dart-only (CLI, server)	Path C below — pure sentry package

---

Path A: Wizard CLI (Recommended)

You need to run this yourself — the wizard opens a browser for login and requires interactive input that the agent can't handle. Copy-paste into your terminal:

brew install getsentry/tools/sentry-wizard && sentry-wizard -i flutter

It handles org/project selection, adds sentry_flutter to pubspec.yaml, updates main.dart, configures sentry_dart_plugin for debug symbol upload, and adds build scripts. Here's what it creates/modifies:

File	Action	Purpose
pubspec.yaml	Adds sentry_flutter dependency and sentry: config block	SDK + symbol upload config
lib/main.dart	Wraps main() with SentryFlutter.init()	SDK initialization
android/app/build.gradle	Adds Proguard config reference	Android obfuscation support
.sentryclirc	Auth token and org/project config	Symbol upload credentials

Once it finishes, come back and skip to Verification.

If the user skips the wizard, proceed with Path B (Manual Setup) below.

---

Path B: Manual — Flutter App

Step 1 — Install

flutter pub add sentry_flutter

Or add to pubspec.yaml manually:

dependencies:
  flutter:
    sdk: flutter
  sentry_flutter: ^9.14.0

Then run:

flutter pub get

Step 2 — Initialize Sentry in lib/main.dart

import 'package:flutter/widgets.dart';
import 'package:sentry_flutter/sentry_flutter.dart';

Future<void> main() async {
  await SentryFlutter.init(
    (options) {
      options.dsn = 'YOUR_SENTRY_DSN';
      options.sendDefaultPii = true;

      // Tracing
      options.tracesSampleRate = 1.0; // lower to 0.1–0.2 in production

      // Profiling (iOS and macOS only — alpha)
      options.profilesSampleRate = 1.0;

      // Session Replay (iOS and Android only)
      options.replay.sessionSampleRate = 0.1;
      options.replay.onErrorSampleRate = 1.0;

      // Structured Logging (SDK ≥9.5.0)
      options.enableLogs = true;

      options.environment = const bool.fromEnvironment('dart.vm.product')
          ? 'production'
          : 'development';
    },
    // REQUIRED: wrap root widget to enable screenshots, replay, user interaction tracing
    appRunner: () => runApp(SentryWidget(child: MyApp())),
  );
}

Step 3 — Add Navigation Observer

Add SentryNavigatorObserver to your MaterialApp or CupertinoApp:

import 'package:flutter/material.dart';
import 'package:sentry_flutter/sentry_flutter.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorObservers: [
        SentryNavigatorObserver(),
      ],
      // Always name your routes for Sentry to track them
      routes: {
        '/': (context) => HomeScreen(),
        '/profile': (context) => ProfileScreen(),
      },
    );
  }
}

For GoRouter:

import 'package:go_router/go_router.dart';
import 'package:sentry_flutter/sentry_flutter.dart';

final GoRouter router = GoRouter(
  observers: [SentryNavigatorObserver()],
  routes: [
    GoRoute(
      path: '/',
      name: 'home', // name is REQUIRED for Sentry route tracking
      builder: (context, state) => const HomeScreen(),
      routes: [
        GoRoute(
          path: 'profile/:id',
          name: 'profile', // name is REQUIRED
          builder: (context, state) => ProfileScreen(
            id: state.pathParameters['id']!,
          ),
        ),
      ],
    ),
  ],
);

Step 4 — Configure Debug Symbol Upload

Readable stack traces in Sentry require uploading debug symbols when building with --obfuscate.

Add to pubspec.yaml:

dev_dependencies:
  sentry_dart_plugin: ^3.2.1

sentry:
  project: YOUR_PROJECT_SLUG
  org: YOUR_ORG_SLUG
  auth_token: YOUR_AUTH_TOKEN  # prefer SENTRY_AUTH_TOKEN env var instead
  upload_debug_symbols: true
  upload_sources: true
  upload_source_maps: true     # for Web

Build and upload:

# Android
flutter build apk \
  --release \
  --obfuscate \
  --split-debug-info=build/debug-info \
  --extra-gen-snapshot-options=--save-obfuscation-map=build/app/obfuscation.map.json
dart run sentry_dart_plugin

# iOS
flutter build ipa \
  --release \
  --obfuscate \
  --split-debug-info=build/debug-info \
  --extra-gen-snapshot-options=--save-obfuscation-map=build/app/obfuscation.map.json
dart run sentry_dart_plugin

# Web
flutter build web --release --source-maps
dart run sentry_dart_plugin

---

Path C: Manual — Dart-Only (CLI / Server)

# pubspec.yaml
dependencies:
  sentry: ^9.14.0

import 'package:sentry/sentry.dart';

Future<void> main() async {
  await Sentry.init(
    (options) {
      options.dsn = 'YOUR_SENTRY_DSN';
      options.tracesSampleRate = 1.0;
      options.enableLogs = true;
    },
    appRunner: myApp,
  );
}

---

Quick Reference: Full-Featured SentryFlutter.init()

import 'package:sentry_flutter/sentry_flutter.dart';

Future<void> main() async {
  await SentryFlutter.init(
    (options) {
      options.dsn = 'YOUR_SENTRY_DSN';
      options.sendDefaultPii = true;

      // Environment — detect release builds via dart.vm.product
      options.environment = const bool.fromEnvironment('dart.vm.product')
          ? 'production'
          : 'development';

      // Release is auto-set on iOS/Android as "packageName@version+build"
      // Override if needed:
      // options.release = 'my-app@1.0.0+42';

      // Error sampling — reduce to drop a fraction of errors in high-volume production
      options.sampleRate = 1.0;

      // Tracing — lower to 0.1–0.2 in high-traffic production
      options.tracesSampleRate = 1.0;

      // Profiling — iOS and macOS only (alpha); relative to tracesSampleRate
      options.profilesSampleRate = 1.0;

      // Session Replay — iOS and Android only (SDK ≥9.0.0)
      options.replay.sessionSampleRate = 0.1;   // record 10% of all sessions
      options.replay.onErrorSampleRate = 1.0;   // always record error sessions

      // Privacy defaults — all text and images masked
      options.privacy.maskAllText = true;
      options.privacy.maskAllImages = true;

      // Structured logging (SDK ≥9.5.0)
      options.enableLogs = true;

      // Attachments
      options.attachScreenshot = true;          // screenshot on error
      options.attachViewHierarchy = true;       // widget tree on error

      // HTTP client
      options.captureFailedRequests = true;     // auto-capture HTTP errors
      options.maxRequestBodySize = MaxRequestBodySize.small;

      // Android specifics
      options.anrEnabled = true;                // ANR detection
      options.enableNdkScopeSync = true;        // sync scope to native
      options.enableTombstone = false;          // Android 12+ tombstone (opt-in)

      // Navigation (Time to Full Display — opt-in)
      options.enableTimeToFullDisplayTracing = true;
    },
    appRunner: () => runApp(SentryWidget(child: MyApp())),
  );
}

---

Navigation: Time to Full Display (TTFD)

TTID (Time to Initial Display) is always enabled. TTFD is opt-in:

// Enable in options:
options.enableTimeToFullDisplayTracing = true;

Then report when your screen has loaded its data:

// Option 1: Widget wrapper (marks TTFD when child first renders)
SentryDisplayWidget(child: MyWidget())

// Option 2: Manual API call (after async data loads)
await _loadData();
SentryFlutter.currentDisplay()?.reportFullyDisplayed();

---

For Each Agreed Feature

Walk through features one at a time. Load the reference file for each, follow its steps, then verify before moving on:

Feature	Reference	Load when...
Error Monitoring	${SKILL_ROOT}/references/error-monitoring.md	Always (baseline)
Tracing & Performance	${SKILL_ROOT}/references/tracing.md	Always — navigation, HTTP, DB spans
Session Replay	${SKILL_ROOT}/references/session-replay.md	iOS/Android user-facing apps
Profiling	${SKILL_ROOT}/references/profiling.md	iOS/macOS performance-sensitive apps
Logging	${SKILL_ROOT}/references/logging.md	Structured logging / log-trace correlation
Metrics	${SKILL_ROOT}/references/metrics.md	Custom business metrics

For each feature: Read ${SKILL_ROOT}/references/<feature>.md, follow steps exactly, verify it works.

---

Configuration Reference

Core SentryFlutter.init() Options

Option	Type	Default	Purpose
dsn	string	—	Required. Project DSN. Env: SENTRY_DSN via --dart-define
environment	string	—	e.g., "production", "staging". Env: SENTRY_ENVIRONMENT
release	string	Auto on iOS/Android	"packageName@version+build". Env: SENTRY_RELEASE
dist	string	—	Distribution identifier; max 64 chars. Env: SENTRY_DIST
sendDefaultPii	bool	false	Include PII: IP address, user labels, widget text in replay
sampleRate	double	1.0	Error event sampling (0.0–1.0)
maxBreadcrumbs	int	100	Max breadcrumbs per event
attachStacktrace	bool	true	Auto-attach stack traces to messages
attachScreenshot	bool	false	Capture screenshot on error (mobile/desktop only)
screenshotQuality	enum	high	Screenshot quality: full, high, medium, low
attachViewHierarchy	bool	false	Attach JSON widget tree as attachment on error
debug	bool	true in debug	Verbose SDK output. Never force true in production
diagnosticLevel	enum	warning	Log verbosity: debug, info, warning, error, fatal
enabled	bool	true	Disable SDK entirely (e.g., for testing)
maxCacheItems	int	30	Max offline-cached envelopes (not supported on Web)
sendClientReports	bool	true	Send SDK health reports (dropped events, etc.)
reportPackages	bool	true	Report pubspec.yaml dependency list
reportSilentFlutterErrors	bool	false	Capture FlutterErrorDetails.silent errors
idleTimeout	Duration	3000ms	Auto-finish idle user interaction transactions

Tracing Options

Option	Type	Default	Purpose
tracesSampleRate	double	—	Transaction sample rate (0–1). Enable by setting >0
tracesSampler	function	—	Per-transaction sampling; overrides tracesSampleRate
tracePropagationTargets	List	—	URLs to attach sentry-trace + baggage headers
propagateTraceparent	bool	false	Also send W3C traceparent header (SDK ≥9.7.0)
enableTimeToFullDisplayTracing	bool	false	Opt-in TTFD tracking per screen
enableAutoPerformanceTracing	bool	true	Auto-enable performance monitoring
enableUserInteractionTracing	bool	true	Create transactions for tap/click/long-press events
enableUserInteractionBreadcrumbs	bool	true	Breadcrumbs for every tracked user interaction

Profiling Options

Option	Type	Default	Purpose
profilesSampleRate	double	—	Profiling rate relative to tracesSampleRate. iOS/macOS only

Native / Mobile Options

Option	Type	Default	Purpose
autoInitializeNativeSdk	bool	true	Auto-initialize native Android/iOS SDK layer
enableNativeCrashHandling	bool	true	Capture native crashes (NDK, signal, Mach exception)
enableNdkScopeSync	bool	true	Sync Dart scope to Android NDK
enableScopeSync	bool	true	Sync scope data to native SDKs
anrEnabled	bool	true	ANR detection (Android)
anrTimeoutInterval	int	5000	ANR timeout in milliseconds (Android)
enableWatchdogTerminationTracking	bool	true	OOM kill tracking (iOS)
enableTombstone	bool	false	Android 12+ native crash info via ApplicationExitInfo
attachThreads	bool	false	Attach all threads on crash (Android)
captureNativeFailedRequests	bool	—	Native HTTP error capture, independent of Dart client (iOS/macOS, v9.11.0+)
enableAutoNativeAppStart	bool	true	App start timing instrumentation (iOS/Android)
enableFramesTracking	bool	true	Slow/frozen frame monitoring (iOS/Android/macOS)
proguardUuid	string	—	Proguard UUID for Android obfuscation mapping

Session & Release Health Options

Option	Type	Default	Purpose
enableAutoSessionTracking	bool	true	Session tracking for crash-free user/session metrics
autoSessionTrackingInterval	Duration	30s	Background inactivity before session ends

Replay Options (options.replay)

Option	Type	Default	Purpose
replay.sessionSampleRate	double	0.0	Fraction of all sessions recorded
replay.onErrorSampleRate	double	0.0	Fraction of error sessions recorded

Replay Privacy Options (options.privacy)

Option / Method	Default	Purpose
privacy.maskAllText	true	Mask all text widget content
privacy.maskAllImages	true	Mask all image widgets
privacy.maskAssetImages	true	Mask images from root asset bundle
privacy.mask<T>()	—	Mask a specific widget type and all subclasses
privacy.unmask<T>()	—	Unmask a specific widget type
privacy.maskCallback<T>()	—	Custom masking decision per widget instance

HTTP Options

Option	Type	Default	Purpose
captureFailedRequests	bool	true (Flutter)	Auto-capture HTTP errors
maxRequestBodySize	enum	never	Body capture: never, small, medium, always
failedRequestStatusCodes	List	[500–599]	Status codes treated as failures
failedRequestTargets	List	['.*']	URL patterns to monitor

Hook Options

Option	Type	Purpose
beforeSend	(SentryEvent, Hint) → SentryEvent?	Modify or drop error events. Return null to drop
beforeSendTransaction	(SentryEvent) → SentryEvent?	Modify or drop transaction events
beforeBreadcrumb	(Breadcrumb, Hint) → Breadcrumb?	Process breadcrumbs before storage
beforeSendLog	(SentryLog) → SentryLog?	Filter structured logs before sending

---

Environment Variables

Pass via --dart-define at build time:

Variable	Purpose	Notes
SENTRY_DSN	Data Source Name	Falls back from options.dsn
SENTRY_ENVIRONMENT	Deployment environment	Falls back from options.environment
SENTRY_RELEASE	Release identifier	Falls back from options.release
SENTRY_DIST	Build distribution	Falls back from options.dist
SENTRY_AUTH_TOKEN	Upload debug symbols	Never embed in app — build tool only
SENTRY_ORG	Organization slug	Used by sentry_dart_plugin
SENTRY_PROJECT	Project slug	Used by sentry_dart_plugin

Usage:

flutter build apk --release \
  --dart-define=SENTRY_DSN=https://[e-mail]/123 \
  --dart-define=SENTRY_ENVIRONMENT=production

Then in code:

options.dsn = const String.fromEnvironment('SENTRY_DSN');
options.environment = const String.fromEnvironment('SENTRY_ENVIRONMENT', defaultValue: 'development');

---

Ecosystem Integrations

Add these packages alongside sentry_flutter for deeper instrumentation:

HTTP Clients

Standard http package — built into sentry_flutter, no extra install:

import 'package:sentry/sentry.dart';

// Wrap your http client
final client = SentryHttpClient(
  captureFailedRequests: true,
  failedRequestStatusCodes: [SentryStatusCode.range(400, 599)],
);
try {
  final response = await client.get(Uri.parse('https://api.example.com/users'));
} finally {
  client.close();
}

Dio — install sentry_dio:

flutter pub add sentry_dio

import 'package:dio/dio.dart';
import 'package:sentry_dio/sentry_dio.dart';

final dio = Dio();
// Add your interceptors first, THEN addSentry() last
dio.addSentry(
  captureFailedRequests: true,
  failedRequestStatusCodes: [SentryStatusCode.range(400, 599)],
);

Databases

Package	Install	Setup
sentry_sqflite	flutter pub add sentry_sqflite	databaseFactory = SentrySqfliteDatabaseFactory();
sentry_drift	flutter pub add sentry_drift	.interceptWith(SentryQueryInterceptor(databaseName: 'db'))
sentry_hive	flutter pub add sentry_hive	Use SentryHive instead of Hive
sentry_isar	flutter pub add sentry_isar	Use SentryIsar.open() instead of Isar.open()

Other

Package	Install	Purpose
sentry_logging	flutter pub add sentry_logging	Dart logging package → Sentry breadcrumbs/events
sentry_link	flutter pub add sentry_link	GraphQL (gql, graphql_flutter, ferry) tracing
sentry_supabase	flutter pub add sentry_supabase	Supabase query tracing (SDK ≥9.9.0)
sentry_firebase_remote_config	flutter pub add sentry_firebase_remote_config	Feature flag tracking
sentry_file	flutter pub add sentry_file	File I/O tracing via .sentryTrace() extension

State Management Patterns

No official packages — wire Sentry via observer APIs:

Framework	Hook point	Pattern
BLoC/Cubit	BlocObserver.onError	Sentry.captureException(error, stackTrace: stackTrace) inside onError; set Bloc.observer = SentryBlocObserver() before init
Riverpod	ProviderObserver.providerDidFail	Fires for FutureProvider/StreamProvider failures; wrap app with ProviderScope(observers: [SentryProviderObserver()])
Provider/ChangeNotifier	try/catch in notifyListeners callers	Manually call Sentry.captureException(e, stackTrace: stack) in catch blocks
GetX	GetMaterialApp.onError	GetMaterialApp(onError: (details) => Sentry.captureException(...))

---

Production Settings

Lower sample rates and harden config before shipping:

Future<void> main() async {
  final isProduction = const bool.fromEnvironment('dart.vm.product');

  await SentryFlutter.init(
    (options) {
      options.dsn = const String.fromEnvironment('SENTRY_DSN');
      options.environment = isProduction ? 'production' : 'development';

      // Trace 10% of transactions in high-traffic production
      options.tracesSampleRate = isProduction ? 0.1 : 1.0;

      // Profile 100% of traced transactions (profiling is always a subset)
      options.profilesSampleRate = 1.0;

      // Replay all error sessions, sample 5% of normal sessions
      options.replay.onErrorSampleRate = 1.0;
      options.replay.sessionSampleRate = isProduction ? 0.05 : 1.0;

      // Disable debug logging in production
      options.debug = !isProduction;
    },
    appRunner: () => runApp(SentryWidget(child: MyApp())),
  );
}

---

Verification

After setup, test that Sentry is receiving events:

// Add a test button somewhere visible during development:
ElevatedButton(
  onPressed: () {
    throw Exception('Sentry test error!');
  },
  child: const Text('Test Sentry Error'),
)

// Or capture manually:
ElevatedButton(
  onPressed: () {
    Sentry.captureMessage('Sentry test message', level: SentryLevel.info);
  },
  child: const Text('Test Sentry Message'),
)

// Test structured logging:
ElevatedButton(
  onPressed: () {
    Sentry.logger.info('Test log from Flutter app');
  },
  child: const Text('Test Sentry Log'),
)

Check the Sentry dashboard:

• Issues → test error should appear within seconds
• Traces → look for a navigation transaction with child spans
• Replays → session recording visible after app interaction (iOS/Android only)
• Logs → structured log entries if enableLogs: true

⚠️ Platform limitations in debug mode:

• Native crashes, session replay, slow/frozen frames, and app start metrics only fully work in release builds on iOS/Android
• Run flutter run --release or use a real device/emulator to test native features
• Debug mode uses the Dart VM with JIT compilation — some native integrations behave differently

---

Default Auto-Enabled Integrations

These are active with no extra config when you call SentryFlutter.init():

Integration	What it does
FlutterErrorIntegration	Captures FlutterError.onError framework errors
RunZonedGuardedIntegration	Catches unhandled Dart exceptions in runZonedGuarded
NativeAppStartIntegration	App start timing (iOS/Android)
FramesTrackingIntegration	Slow/frozen frames (iOS/Android/macOS)
NativeUserInteractionIntegration	User interaction breadcrumbs from native layer
UserInteractionIntegration	Dart-layer tap/click transactions (requires SentryWidget)
DeviceContextIntegration	Device model, OS version, screen resolution
AppContextIntegration	App version, build number, bundle ID
ConnectivityIntegration	Network connectivity change breadcrumbs
HttpClientIntegration	Auto-instrument Dart http requests
SdkIntegration	SDK metadata tagging
ReleaseIntegration	Auto-set release on iOS/Android from package info

---

Phase 4: Cross-Link

After completing Flutter setup, check for a backend missing Sentry coverage:

# Adjacent backend directories
ls ../backend ../server ../api 2>/dev/null
cat ../go.mod 2>/dev/null | head -3
cat ../requirements.txt ../pyproject.toml 2>/dev/null | head -3
cat ../Gemfile 2>/dev/null | head -3
ls ../backend/package.json ../server/package.json 2>/dev/null

If a backend exists without Sentry, suggest the matching skill:

Detected	Suggest skill
Go backend (go.mod)	sentry-go-sdk
Python backend (requirements.txt, pyproject.toml)	sentry-python-sdk
Ruby backend (Gemfile)	sentry-ruby-sdk
Node.js backend	sentry-node-sdk
.NET backend (*.csproj)	sentry-dotnet-sdk
React / Next.js web	sentry-react-sdk / sentry-nextjs-sdk

Distributed tracing — if a backend skill is added, configure tracePropagationTargets in Flutter to propagate trace context to your API:

options.tracePropagationTargets = ['api.myapp.com', 'localhost'];
options.propagateTraceparent = true; // also send W3C traceparent header

This links mobile transactions to backend traces in the Sentry waterfall view.

---

Troubleshooting

Issue	Solution
Events not appearing in Sentry	Set options.debug = true — SDK logs to Flutter console; verify DSN is correct
SentryFlutter.init throws	Ensure main() is async and you await SentryFlutter.init(...)
Stack traces unreadable in Sentry	Upload debug symbols with sentry_dart_plugin; build with --obfuscate --split-debug-info
Stack traces missing on Web	Build with --source-maps and run dart run sentry_dart_plugin to upload
Native crashes not captured	Confirm enableNativeCrashHandling: true; test in release mode, not debug
Session replay not recording	iOS/Android only; confirm SentryWidget wraps root; check replay.onErrorSampleRate
Replay shows blank screens	Confirm SentryWidget(child: MyApp()) is outermost widget; not inside navigator
Profiling not working	iOS and macOS only (alpha); confirm tracesSampleRate > 0 is set first
Navigation not tracked	Add SentryNavigatorObserver() to navigatorObservers; name all routes
GoRouter routes unnamed	Add name: to all GoRoute entries — unnamed routes are tracked as null
TTFD never reports	Call SentryFlutter.currentDisplay()?.reportFullyDisplayed() after data loads, or wrap with SentryDisplayWidget
sentry_dart_plugin auth error	Set SENTRY_AUTH_TOKEN env var instead of hardcoding in pubspec.yaml
Android ProGuard mapping missing	Ensure --extra-gen-snapshot-options=--save-obfuscation-map=... flag is set
iOS dSYM not uploaded	sentry_dart_plugin handles this; check upload_debug_symbols: true in pubspec.yaml sentry: block
pub get fails: Dart SDK too old	sentry_flutter ≥9.0.0 requires Dart ≥3.5.0; run flutter upgrade
Hot restart crashes on Android debug	Known issue (fixed in SDK ≥9.9.0); upgrade if on older version
ANR detection too aggressive	Increase anrTimeoutInterval (default: 5000ms)
Too many transactions in dashboard	Lower tracesSampleRate to 0.1 or use tracesSampler to drop health checks
beforeSend not firing for native crashes	Expected — beforeSend intercepts only Dart-layer events; native crashes bypass it
Crons not available	The Flutter/Dart SDK does not support Sentry Crons; use a server-side SDK instead
SentryWidget warning in tests	Wrap test widget with SentryFlutter.init() in setUpAll, or use enabled: false
Firebase Remote Config: Linux/Windows	sentry_firebase_remote_config not supported on Linux/Windows (Firebase limitation)
Isar tracing on Web	sentry_isar does NOT support Web (Isar does not support Web)