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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:

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:

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

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:

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

Configuration Reference

Core SentryFlutter.init() Options

Tracing Options

Profiling Options

Native / Mobile Options

Session & Release Health Options

Replay Options (options.replay)

Replay Privacy Options (options.privacy)

HTTP Options

Hook Options

Environment Variables

Pass via --dart-define at build time:

Usage:

flutter build apk --release \
  --dart-define=SENTRY_DSN=https://xxx@sentry.io/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

Other

State Management Patterns

No official packages — wire Sentry via observer APIs:

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():

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:

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