Agent skill

Firebase Crashlytics

A skill your agent uses when implementing crash reporting, capturing fatal/non-fatal errors, recording isolate/async exceptions, customizing reports, or uploading obfuscated symbols.

MITAuto-check passedMobile

Install Firebase Crashlytics

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a claude-code

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

GitHub CLI

$ gh skill install evanca/flutter-ai-rules firebase-crashlytics --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/evanca/flutter-ai-rules.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/firebase-crashlytics .claude/skills/firebase-crashlytics && 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/

Paste into Claude Code

Install the "firebase-crashlytics" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/firebase-crashlytics into .claude/skills/firebase-crashlytics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firebase-crashlytics", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/evanca/flutter-ai-rules/tree/main/skills/firebase-crashlytics

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules firebase-crashlytics --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/firebase-crashlytics .agents/skills/firebase-crashlytics && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "firebase-crashlytics" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/firebase-crashlytics into .agents/skills/firebase-crashlytics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firebase-crashlytics", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules firebase-crashlytics --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/firebase-crashlytics .cursor/skills/firebase-crashlytics && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "firebase-crashlytics" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/firebase-crashlytics into .cursor/skills/firebase-crashlytics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firebase-crashlytics", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/evanca/flutter-ai-rules.git --path skills/firebase-crashlytics

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules firebase-crashlytics --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/firebase-crashlytics .gemini/skills/firebase-crashlytics && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "firebase-crashlytics" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/firebase-crashlytics into .gemini/skills/firebase-crashlytics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firebase-crashlytics", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules firebase-crashlytics

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/firebase-crashlytics .github/skills/firebase-crashlytics && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "firebase-crashlytics" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/firebase-crashlytics into .github/skills/firebase-crashlytics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firebase-crashlytics", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules firebase-crashlytics --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/firebase-crashlytics .opencode/skills/firebase-crashlytics && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "firebase-crashlytics" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/firebase-crashlytics into .opencode/skills/firebase-crashlytics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firebase-crashlytics", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: firebase-crashlytics
GitHub stars: 649
Token cost: ~1.4k tokens
SKILL.md length: 424 words
Files: 1
Skills in repo: 37
Repo updated: Sep 14, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

A skill your agent uses when implementing crash reporting, capturing fatal/non-fatal errors, recording isolate/async exceptions, customizing reports, or uploading obfuscated symbols.

Works in 6 steps: Setup and Configuration → Error Handling → Crash Report Customization → …
Implementing crash reporting
SKILL.md covers When to Use, 1. Setup and Configuration, 2. Error Handling and 3. Crash Report Customization, plus 4 more sections
Calls flutter and firebase

What it does

Firebase Crashlytics is an agent skill from evanca/flutter-ai-rules. Use when implementing crash reporting, capturing fatal/non-fatal errors, recording isolate/async exceptions, customizing reports, or uploading obfuscated symbols.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Mobile, covering Cross-platform mobile apps. It works with Firebase and Flutter. The repository describes itself as: Flutter AI Skills and Rules for Claude, Codex, Cursor, and Other AI-Powered IDEs. The licence is MIT.

When your agent uses it

Implementing crash reporting
Capturing fatal/non-fatal errors
Recording isolate/async exceptions
Customizing reports

Example prompts

“/firebase-crashlytics”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

Setup and Configuration
Error Handling
Crash Report Customization
Performance and Optimization
Testing and Debugging
Opt-in Reporting

What it can do on your machine

Read from SKILL.md and the folder at commit 7b9cce2. 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
Shell commands in SKILL.md call:
- flutter
- firebase
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- firebase.google.com
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

Firebase Crashlytics loads about 1.4k tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 424 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~46
When it runs · the whole SKILL.md, loaded when a task matches: ~1.4k

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 evanca/flutter-ai-rules at commit 7b9cce2, republished under its MIT licence (© evanca). 424 words, ~1,378 tokens.

Download SKILL.mdSave it as .claude/skills/firebase-crashlytics/SKILL.md (or your agent's skills folder).

name: firebase-crashlytics
description: Use when implementing crash reporting, capturing fatal/non-fatal errors, recording isolate/async exceptions, customizing reports, or uploading obfuscated symbols.
license: MIT

Firebase Crashlytics Skill

This skill defines how to correctly use Firebase Crashlytics in Flutter applications.

When to Use

Use this skill when:

Implementing crash reporting in a Flutter project.
Capturing fatal errors, non-fatal exceptions, and async/isolate errors.
Customizing crash reports with keys, logs, and user identifiers.
Configuring opt-in data collection or disabling reporting in debug builds.
Uploading symbol files for obfuscated builds.

1. Setup and Configuration

flutter pub add firebase_crashlytics
flutter pub add firebase_analytics  # enables breadcrumb logs for better crash context

Run flutterfire configure to update the Firebase configuration and add the required Crashlytics Gradle plugin for Android.

dart

import 'package:firebase_crashlytics/firebase_crashlytics.dart';

Obfuscated code:

For apps built with --split-debug-info and/or --obfuscate, upload symbol files for readable stack traces.
iOS: Flutter 3.12.0+ and Crashlytics Flutter plugin 3.3.4+ handle symbol upload automatically.
Android: Use Firebase CLI (v11.9.0+) to upload Flutter debug symbols:

bash

firebase crashlytics:symbols:upload --app=FIREBASE_APP_ID PATH/TO/symbols

2. Error Handling

Configure comprehensive error capture in main() to catch errors from all sources:

Fatal Flutter errors:

dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  // Pass all uncaught fatal errors from the framework to Crashlytics
  FlutterError.onError = FirebaseCrashlytics.instance.recordFlutterFatalError;

  // Catch async errors not handled by the Flutter framework
  PlatformDispatcher.instance.onError = (error, stack) {
    FirebaseCrashlytics.instance.recordError(error, stack, fatal: true);
    return true;
  };

  runApp(MyApp());
}

Non-fatal Flutter errors: use recordFlutterError instead of recordFlutterFatalError.

Isolate errors:

dart

Isolate.current.addErrorListener(RawReceivePort((pair) async {
  final List<dynamic> errorAndStacktrace = pair;
  await FirebaseCrashlytics.instance.recordError(
    errorAndStacktrace.first,
    errorAndStacktrace.last,
    fatal: true,
  );
}).sendPort);

Caught exceptions (non-fatal):

dart

await FirebaseCrashlytics.instance.recordError(
  error,
  stackTrace,
  reason: 'a non-fatal error',
  information: ['further diagnostic information about the error', 'version 2.0'],
);

Crashlytics only stores the most recent 8 non-fatal exceptions per session — older ones are discarded.

3. Crash Report Customization

Custom keys (max 64 key/value pairs, up to 1 kB each):

dart

FirebaseCrashlytics.instance.setCustomKey('str_key', 'hello');
FirebaseCrashlytics.instance.setCustomKey('bool_key', true);
FirebaseCrashlytics.instance.setCustomKey('int_key', 1);

Custom log messages (limit: 64 kB per session):

dart

FirebaseCrashlytics.instance.log("User tapped on payment button");

User identifier:

dart

FirebaseCrashlytics.instance.setUserIdentifier("user-123");
// Clear by setting to blank string
FirebaseCrashlytics.instance.setUserIdentifier("");

Avoid putting unique values (user IDs, timestamps) directly in exception messages — use custom keys instead.

4. Performance and Optimization

Crashlytics processes exceptions on a dedicated background thread to minimize performance impact.
Fatal reports are sent in real-time without requiring an app restart.
Non-fatal reports are written to disk and sent with the next fatal report or on app restart.
Use breadcrumb logs (requires Firebase Analytics) to understand user actions leading up to a crash.

Disable Crashlytics in debug builds:

dart

if (kReleaseMode) {
  await FirebaseCrashlytics.instance.setCrashlyticsCollectionEnabled(true);
} else {
  await FirebaseCrashlytics.instance.setCrashlyticsCollectionEnabled(false);
}

Show full SKILL.md (153 more words)Show less

5. Testing and Debugging

Force a test crash to verify the setup:

dart

FirebaseCrashlytics.instance.crash();

Verification workflow:

Build and run the app in release mode.
Trigger the test crash.
Reopen the app so the crash report is uploaded.
Check the Firebase Console Crashlytics dashboard within 5 minutes.
Verify that custom keys, logs, and user identifiers appear on the crash report.

Verify stack traces are properly symbolicated when using code obfuscation.

6. Opt-in Reporting

By default, Crashlytics automatically collects crash reports for all users.

To give users control over data collection:

Disable automatic reporting and enable it only via setCrashlyticsCollectionEnabled(true) when users opt in.
The override value persists across all subsequent app launches.
To opt a user out, pass false — this applies from the next app launch.
When disabled, crash info is stored locally; if later enabled, locally stored crashes are sent to Crashlytics.

References

Files

Just SKILL.md in skills/firebase-crashlytics of evanca/flutter-ai-rules.

Open the folder on GitHubat commit 7b9cce2

Compare with similar skills

Firebase Crashlytics 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.

Firebase Crashlytics compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Firebase Crashlytics this skillevanca/flutter-ai-rules	649	—	~1.4k	Automated safety check: Pass	MIT	24 days ago
Cometchat Flutter V6 Pushcometchat/cometchat-skills	130	—	~1.4k	Automated safety check: Pass	MIT	3 days ago
Web3authWeb3Auth/web3auth-examples	144	—	~1.4k	Automated safety check: Pass	MIT	5 days ago
Retrieving Developer Knowledgegoogle/skills	21k	—	~2k	Automated safety check: Pass	Apache-2.0	today
Engine Whats Newflutter/flutter	179k	—	~978	Automated safety check: Pass	BSD-3-Clause	today
Flutter Cherry Pickflutter/flutter	179k	—	~1.8k	Automated safety check: Pass	BSD-3-Clause	today

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Works with

Questions about Firebase Crashlytics

What does Firebase Crashlytics do?

A skill your agent uses when implementing crash reporting, capturing fatal/non-fatal errors, recording isolate/async exceptions, customizing reports, or uploading obfuscated symbols. Firebase Crashlytics is an agent skill from evanca/flutter-ai-rules. Use when implementing crash reporting, capturing fatal/non-fatal errors, recording isolate/async exceptions, customizing reports, or uploading obfuscated symbols.

When should I use Firebase Crashlytics?

Firebase Crashlytics fits situations like: implementing crash reporting; capturing fatal/non-fatal errors; recording isolate/async exceptions; customizing reports.

How do I install Firebase Crashlytics in Claude Code?

Run `npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a claude-code`. Or copy the skill folder (skills/firebase-crashlytics in evanca/flutter-ai-rules) into .claude/skills/firebase-crashlytics in your project. Claude Code loads it when a task matches its description.

How do I install Firebase Crashlytics in Codex?

Run `npx skills add evanca/flutter-ai-rules --skill firebase-crashlytics -a codex`. Or copy the skill folder (skills/firebase-crashlytics in evanca/flutter-ai-rules) into .agents/skills/firebase-crashlytics in your project. Codex loads it when a task matches its description.

Can I use Firebase Crashlytics 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 evanca/flutter-ai-rules --skill firebase-crashlytics -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/firebase-crashlytics, .gemini/skills/firebase-crashlytics, .github/skills/firebase-crashlytics and .opencode/skills/firebase-crashlytics in your project.

What does Firebase Crashlytics need to run?

Going by SKILL.md and its folder, Firebase Crashlytics needs the command-line tools its instructions call (flutter and firebase).

Does Firebase Crashlytics access the network?

SKILL.md names 1 domain. As links in the text: firebase.google.com. This is read from the text; nothing was executed.

Is Firebase Crashlytics 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 Firebase Crashlytics use?

Firebase Crashlytics is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Firebase Crashlytics use?

About 1.4k tokens (SKILL.md is roughly 5.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Firebase Crashlytics?

Skills that share tags, products or a category with Firebase Crashlytics: Cometchat Flutter V6 Push (cometchat/cometchat-skills, 130 stars), Web3auth (Web3Auth/web3auth-examples, 144 stars), Retrieving Developer Knowledge (google/skills, 21k stars) and Engine Whats New (flutter/flutter, 179k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Firebase Crashlytics?

evanca (a GitHub user) maintains it in evanca/flutter-ai-rules, which has 649 GitHub stars. The repository holds 37 skills in this directory. The repository was last updated on September 14, 2026.

Source: evanca/flutter-ai-rules on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Firebase Crashlytics

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Firebase Crashlytics Skill

When to Use

1. Setup and Configuration

2. Error Handling

3. Crash Report Customization

4. Performance and Optimization

5. Testing and Debugging

6. Opt-in Reporting

References

Files

Compare with similar skills

Similar skills

More from evanca/flutter-ai-rules

Related

Questions about Firebase Crashlytics